<?xml version="1.0" encoding="UTF-8"?>

<!--XBRL Document Created with Wdesk from Workiva-->
<!--Copyright 2022 Workiva-->
<!--r:c608ddb9-dfee-484b-86cb-42e6685b4f90,g:598bf620-965a-4204-b6cf-954348ae7e87-->
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns:link="http://www.xbrl.org/2003/linkbase" xmlns:nnbr="http://www.nninc.com/20220930" xmlns:xbrli="http://www.xbrl.org/2003/instance" xmlns:dtr-types="http://www.xbrl.org/dtr/type/2020-01-21" attributeFormDefault="unqualified" elementFormDefault="qualified" targetNamespace="http://www.nninc.com/20220930">
  <xs:import namespace="http://fasb.org/srt/2021-01-31" schemaLocation="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd"/>
  <xs:import namespace="http://fasb.org/us-gaap/2021-01-31" schemaLocation="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd"/>
  <xs:import namespace="http://www.w3.org/1999/xlink" schemaLocation="http://www.xbrl.org/2003/xlink-2003-12-31.xsd"/>
  <xs:import namespace="http://www.xbrl.org/2003/instance" schemaLocation="http://www.xbrl.org/2003/xbrl-instance-2003-12-31.xsd"/>
  <xs:import namespace="http://www.xbrl.org/2003/linkbase" schemaLocation="http://www.xbrl.org/2003/xbrl-linkbase-2003-12-31.xsd"/>
  <xs:import namespace="http://www.xbrl.org/dtr/type/2020-01-21" schemaLocation="https://www.xbrl.org/dtr/type/2020-01-21/types.xsd"/>
  <xs:import namespace="http://xbrl.sec.gov/country/2021" schemaLocation="https://xbrl.sec.gov/country/2021/country-2021.xsd"/>
  <xs:import namespace="http://xbrl.sec.gov/dei/2021q4" schemaLocation="https://xbrl.sec.gov/dei/2021q4/dei-2021q4.xsd"/>
  <xs:annotation>
    <xs:appinfo>
      <link:linkbaseRef xmlns:xlink="http://www.w3.org/1999/xlink" xlink:arcrole="http://www.w3.org/1999/xlink/properties/linkbase" xlink:href="nnbr-20220930_lab.xml" xlink:role="http://www.xbrl.org/2003/role/labelLinkbaseRef" xlink:type="simple"/>
      <link:linkbaseRef xmlns:xlink="http://www.w3.org/1999/xlink" xlink:arcrole="http://www.w3.org/1999/xlink/properties/linkbase" xlink:href="nnbr-20220930_pre.xml" xlink:role="http://www.xbrl.org/2003/role/presentationLinkbaseRef" xlink:type="simple"/>
      <link:linkbaseRef xmlns:xlink="http://www.w3.org/1999/xlink" xlink:arcrole="http://www.w3.org/1999/xlink/properties/linkbase" xlink:href="nnbr-20220930_cal.xml" xlink:role="http://www.xbrl.org/2003/role/calculationLinkbaseRef" xlink:type="simple"/>
      <link:linkbaseRef xmlns:xlink="http://www.w3.org/1999/xlink" xlink:arcrole="http://www.w3.org/1999/xlink/properties/linkbase" xlink:href="nnbr-20220930_def.xml" xlink:role="http://www.xbrl.org/2003/role/definitionLinkbaseRef" xlink:type="simple"/>
      <link:roleType id="CoverPage" roleURI="http://www.nninc.com/role/CoverPage">
        <link:definition>0000001 - Document - Cover Page</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="CondensedConsolidatedStatementsofOperationsandComprehensiveIncomeLoss" roleURI="http://www.nninc.com/role/CondensedConsolidatedStatementsofOperationsandComprehensiveIncomeLoss">
        <link:definition>0000002 - Statement - Condensed Consolidated Statements of Operations and Comprehensive Income (Loss)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="CondensedConsolidatedBalanceSheets" roleURI="http://www.nninc.com/role/CondensedConsolidatedBalanceSheets">
        <link:definition>0000003 - Statement - Condensed Consolidated Balance Sheets</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="CondensedConsolidatedBalanceSheetsParenthetical" roleURI="http://www.nninc.com/role/CondensedConsolidatedBalanceSheetsParenthetical">
        <link:definition>0000004 - Statement - Condensed Consolidated Balance Sheets (Parenthetical)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="CondensedConsolidatedStatementsofChangesinStockholdersEquity" roleURI="http://www.nninc.com/role/CondensedConsolidatedStatementsofChangesinStockholdersEquity">
        <link:definition>0000005 - Statement - Condensed Consolidated Statements of Changes in Stockholders' Equity</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="CondensedConsolidatedStatementofChangesinStockholdersEquityParenthetical" roleURI="http://www.nninc.com/role/CondensedConsolidatedStatementofChangesinStockholdersEquityParenthetical">
        <link:definition>0000006 - Statement - Condensed Consolidated Statement of Changes in Stockholders' Equity (Parenthetical)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="CondensedConsolidatedStatementsofCashFlows" roleURI="http://www.nninc.com/role/CondensedConsolidatedStatementsofCashFlows">
        <link:definition>0000007 - Statement - Condensed Consolidated Statements of Cash Flows</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="CondensedConsolidatedStatementsofCashFlowsParenthetical" roleURI="http://www.nninc.com/role/CondensedConsolidatedStatementsofCashFlowsParenthetical">
        <link:definition>0000008 - Statement - Condensed Consolidated Statements of Cash Flows (Parenthetical)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="InterimFinancialStatements" roleURI="http://www.nninc.com/role/InterimFinancialStatements">
        <link:definition>0000009 - Disclosure - Interim Financial Statements</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="SegmentInformation" roleURI="http://www.nninc.com/role/SegmentInformation">
        <link:definition>0000010 - Disclosure - Segment Information</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="Inventories" roleURI="http://www.nninc.com/role/Inventories">
        <link:definition>0000011 - Disclosure - Inventories</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="IntangibleAssetsNet" roleURI="http://www.nninc.com/role/IntangibleAssetsNet">
        <link:definition>0000012 - Disclosure - Intangible Assets, Net</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="InvestmentinJointVenture" roleURI="http://www.nninc.com/role/InvestmentinJointVenture">
        <link:definition>0000013 - Disclosure - Investment in Joint Venture</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="IncomeTaxes" roleURI="http://www.nninc.com/role/IncomeTaxes">
        <link:definition>0000014 - Disclosure - Income Taxes</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="Debt" roleURI="http://www.nninc.com/role/Debt">
        <link:definition>0000015 - Disclosure - Debt</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="Leases" roleURI="http://www.nninc.com/role/Leases">
        <link:definition>0000016 - Disclosure - Leases</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="CommitmentsandContingencies" roleURI="http://www.nninc.com/role/CommitmentsandContingencies">
        <link:definition>0000017 - Disclosure - Commitments and Contingencies</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="PreferredStockandStockholdersEquity" roleURI="http://www.nninc.com/role/PreferredStockandStockholdersEquity">
        <link:definition>0000018 - Disclosure - Preferred Stock and Stockholders' Equity</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="RevenuefromContractswithCustomers" roleURI="http://www.nninc.com/role/RevenuefromContractswithCustomers">
        <link:definition>0000019 - Disclosure - Revenue from Contracts with Customers</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="SharedBasedCompensation" roleURI="http://www.nninc.com/role/SharedBasedCompensation">
        <link:definition>0000020 - Disclosure - Shared-Based Compensation</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="AccumulatedOtherComprehensiveIncome" roleURI="http://www.nninc.com/role/AccumulatedOtherComprehensiveIncome">
        <link:definition>0000021 - Disclosure - Accumulated Other Comprehensive Income</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="NetIncomeLossPerCommonShare" roleURI="http://www.nninc.com/role/NetIncomeLossPerCommonShare">
        <link:definition>0000022 - Disclosure - Net Income (Loss) Per Common Share</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="FairValueMeasurements" roleURI="http://www.nninc.com/role/FairValueMeasurements">
        <link:definition>0000023 - Disclosure - Fair Value Measurements</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="SubsequentEvents" roleURI="http://www.nninc.com/role/SubsequentEvents">
        <link:definition>0000024 - Disclosure - Subsequent Events</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="InterimFinancialStatementsPolicies" roleURI="http://www.nninc.com/role/InterimFinancialStatementsPolicies">
        <link:definition>0000025 - Disclosure - Interim Financial Statements (Policies)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="SegmentInformationTables" roleURI="http://www.nninc.com/role/SegmentInformationTables">
        <link:definition>0000026 - Disclosure - Segment Information (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="InventoriesTables" roleURI="http://www.nninc.com/role/InventoriesTables">
        <link:definition>0000027 - Disclosure - Inventories (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="IntangibleAssetsNetTables" roleURI="http://www.nninc.com/role/IntangibleAssetsNetTables">
        <link:definition>0000028 - Disclosure - Intangible Assets, Net (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="InvestmentinJointVentureTables" roleURI="http://www.nninc.com/role/InvestmentinJointVentureTables">
        <link:definition>0000029 - Disclosure - Investment in Joint Venture (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="DebtTables" roleURI="http://www.nninc.com/role/DebtTables">
        <link:definition>0000030 - Disclosure - Debt (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="LeasesTables" roleURI="http://www.nninc.com/role/LeasesTables">
        <link:definition>0000031 - Disclosure - Leases (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="PreferredStockandStockholdersEquityTables" roleURI="http://www.nninc.com/role/PreferredStockandStockholdersEquityTables">
        <link:definition>0000032 - Disclosure - Preferred Stock and Stockholders' Equity (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="RevenuefromContractswithCustomersTables" roleURI="http://www.nninc.com/role/RevenuefromContractswithCustomersTables">
        <link:definition>0000033 - Disclosure - Revenue from Contracts with Customers (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="SharedBasedCompensationTables" roleURI="http://www.nninc.com/role/SharedBasedCompensationTables">
        <link:definition>0000034 - Disclosure - Shared-Based Compensation (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="AccumulatedOtherComprehensiveIncomeTables" roleURI="http://www.nninc.com/role/AccumulatedOtherComprehensiveIncomeTables">
        <link:definition>0000035 - Disclosure - Accumulated Other Comprehensive Income (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="NetIncomeLossPerCommonShareTables" roleURI="http://www.nninc.com/role/NetIncomeLossPerCommonShareTables">
        <link:definition>0000036 - Disclosure - Net Income (Loss) Per Common Share (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="FairValueMeasurementsTables" roleURI="http://www.nninc.com/role/FairValueMeasurementsTables">
        <link:definition>0000037 - Disclosure - Fair Value Measurements (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="SegmentInformationContinuingOperationsbyReportableSegmentDetail" roleURI="http://www.nninc.com/role/SegmentInformationContinuingOperationsbyReportableSegmentDetail">
        <link:definition>0000038 - Disclosure - Segment Information - Continuing Operations by Reportable Segment (Detail)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="SegmentInformationAdditionalInformationDetails" roleURI="http://www.nninc.com/role/SegmentInformationAdditionalInformationDetails">
        <link:definition>0000039 - Disclosure - Segment Information - Additional Information (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="InventoriesSummaryofInventoriesDetail" roleURI="http://www.nninc.com/role/InventoriesSummaryofInventoriesDetail">
        <link:definition>0000040 - Disclosure - Inventories - Summary of Inventories (Detail)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="IntangibleAssetsNetSummaryofCarryingAmountofIntangibleAssetsbySegmentDetail" roleURI="http://www.nninc.com/role/IntangibleAssetsNetSummaryofCarryingAmountofIntangibleAssetsbySegmentDetail">
        <link:definition>0000041 - Disclosure - Intangible Assets, Net - Summary of Carrying Amount of Intangible Assets by Segment (Detail)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="InvestmentinJointVentureAdditionalInformationDetail" roleURI="http://www.nninc.com/role/InvestmentinJointVentureAdditionalInformationDetail">
        <link:definition>0000042 - Disclosure - Investment in Joint Venture - Additional Information (Detail)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="InvestmentinJointVentureSummarizedActivityRelatedtoInvestmentinJointVentureDetail" roleURI="http://www.nninc.com/role/InvestmentinJointVentureSummarizedActivityRelatedtoInvestmentinJointVentureDetail">
        <link:definition>0000043 - Disclosure - Investment in Joint Venture - Summarized Activity Related to Investment in Joint Venture (Detail)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="IncomeTaxesAdditionalInformationDetail" roleURI="http://www.nninc.com/role/IncomeTaxesAdditionalInformationDetail">
        <link:definition>0000044 - Disclosure - Income Taxes - Additional Information (Detail)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="DebtAdditionalInformationDetail" roleURI="http://www.nninc.com/role/DebtAdditionalInformationDetail">
        <link:definition>0000045 - Disclosure - Debt - Additional Information (Detail)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="DebtSummaryofDebtDetail" roleURI="http://www.nninc.com/role/DebtSummaryofDebtDetail">
        <link:definition>0000046 - Disclosure - Debt - Summary of Debt (Detail)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="LeasesSupplementalCashFlowInformationDetails" roleURI="http://www.nninc.com/role/LeasesSupplementalCashFlowInformationDetails">
        <link:definition>0000047 - Disclosure - Leases - Supplemental Cash Flow Information (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="LeasesNarrativeDetails" roleURI="http://www.nninc.com/role/LeasesNarrativeDetails">
        <link:definition>0000048 - Disclosure - Leases - Narrative (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="CommitmentsandContingenciesAdditionalInformationDetail" roleURI="http://www.nninc.com/role/CommitmentsandContingenciesAdditionalInformationDetail">
        <link:definition>0000049 - Disclosure - Commitments and Contingencies - Additional Information (Detail)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="PreferredStockandStockholdersEquityAdditionalInformationDetails" roleURI="http://www.nninc.com/role/PreferredStockandStockholdersEquityAdditionalInformationDetails">
        <link:definition>0000050 - Disclosure - Preferred Stock and Stockholders' Equity - Additional Information (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="PreferredStockandStockholdersEquityCarryingValueRollForwardDetails" roleURI="http://www.nninc.com/role/PreferredStockandStockholdersEquityCarryingValueRollForwardDetails">
        <link:definition>0000051 - Disclosure - Preferred Stock and Stockholders' Equity - Carrying Value Roll Forward (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="RevenuefromContractswithCustomersSummaryofRevenuefromContractswithCustomersDetail" roleURI="http://www.nninc.com/role/RevenuefromContractswithCustomersSummaryofRevenuefromContractswithCustomersDetail">
        <link:definition>0000052 - Disclosure - Revenue from Contracts with Customers - Summary of Revenue from Contracts with Customers (Detail)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="RevenuefromContractswithCustomersAdditionalInformationDetails" roleURI="http://www.nninc.com/role/RevenuefromContractswithCustomersAdditionalInformationDetails">
        <link:definition>0000053 - Disclosure - Revenue from Contracts with Customers - Additional Information (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="RevenuefromContractswithCustomersSummaryofContractLiabilitiesfromContractswithCustomersDetail" roleURI="http://www.nninc.com/role/RevenuefromContractswithCustomersSummaryofContractLiabilitiesfromContractswithCustomersDetail">
        <link:definition>0000054 - Disclosure - Revenue from Contracts with Customers - Summary of Contract Liabilities from Contracts with Customers (Detail)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="SharedBasedCompensationAdditionalInformationDetail" roleURI="http://www.nninc.com/role/SharedBasedCompensationAdditionalInformationDetail">
        <link:definition>0000055 - Disclosure - Shared-Based Compensation - Additional Information (Detail)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="SharedBasedCompensationComponentsofShareBasedCompensationExpensebyTypeofAwardDetail" roleURI="http://www.nninc.com/role/SharedBasedCompensationComponentsofShareBasedCompensationExpensebyTypeofAwardDetail">
        <link:definition>0000056 - Disclosure - Shared-Based Compensation - Components of Share-Based Compensation Expense by Type of Award (Detail)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="SharedBasedCompensationReconciliationofOptionActivityDetail" roleURI="http://www.nninc.com/role/SharedBasedCompensationReconciliationofOptionActivityDetail">
        <link:definition>0000057 - Disclosure - Shared-Based Compensation - Reconciliation of Option Activity (Detail)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="SharedBasedCompensationReconciliationofRestrictedStockOptionActivityDetail" roleURI="http://www.nninc.com/role/SharedBasedCompensationReconciliationofRestrictedStockOptionActivityDetail">
        <link:definition>0000058 - Disclosure - Shared-Based Compensation - Reconciliation of Restricted Stock Option Activity (Detail)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="SharedBasedCompensationScheduleofPerformanceBasedAwardsGoalswithRespecttoTSRandROICDetail" roleURI="http://www.nninc.com/role/SharedBasedCompensationScheduleofPerformanceBasedAwardsGoalswithRespecttoTSRandROICDetail">
        <link:definition>0000059 - Disclosure - Shared-Based Compensation - Schedule of Performance Based Awards Goals with Respect to TSR and ROIC (Detail)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="SharedBasedCompensationSummaryofNumberofAwardsGrantedandGrandDateFairValueDetail" roleURI="http://www.nninc.com/role/SharedBasedCompensationSummaryofNumberofAwardsGrantedandGrandDateFairValueDetail">
        <link:definition>0000060 - Disclosure - Shared-Based Compensation - Summary of Number of Awards Granted and Grand Date Fair Value (Detail)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="AccumulatedOtherComprehensiveIncomeDetails" roleURI="http://www.nninc.com/role/AccumulatedOtherComprehensiveIncomeDetails">
        <link:definition>0000061 - Disclosure - Accumulated Other Comprehensive Income (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="NetIncomeLossPerCommonShareSummaryofNetIncomeLossPerShareDetail" roleURI="http://www.nninc.com/role/NetIncomeLossPerCommonShareSummaryofNetIncomeLossPerShareDetail">
        <link:definition>0000062 - Disclosure - Net Income (Loss) Per Common Share - Summary of Net Income (Loss) Per Share (Detail)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="NetIncomeLossPerCommonShareAntidilutiveSecuritiesExcludedfromComputationDetails" roleURI="http://www.nninc.com/role/NetIncomeLossPerCommonShareAntidilutiveSecuritiesExcludedfromComputationDetails">
        <link:definition>0000063 - Disclosure - Net Income (Loss) Per Common Share - Antidilutive Securities Excluded from Computation (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="NetIncomeLossPerCommonShareAdditionalInformationDetail" roleURI="http://www.nninc.com/role/NetIncomeLossPerCommonShareAdditionalInformationDetail">
        <link:definition>0000064 - Disclosure - Net Income (Loss) Per Common Share - Additional Information (Detail)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="FairValueMeasurementsAdditionalInformationDetail" roleURI="http://www.nninc.com/role/FairValueMeasurementsAdditionalInformationDetail">
        <link:definition>0000065 - Disclosure - Fair Value Measurements - Additional Information (Detail)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="FairValueMeasurementsLiabilitiesMeasureatFairValuePreferredStockDetails" roleURI="http://www.nninc.com/role/FairValueMeasurementsLiabilitiesMeasureatFairValuePreferredStockDetails">
        <link:definition>0000066 - Disclosure - Fair Value Measurements - Liabilities Measure at Fair Value Preferred Stock (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="FairValueMeasurementsRollForwardofPreferredStockDerivativeDetails" roleURI="http://www.nninc.com/role/FairValueMeasurementsRollForwardofPreferredStockDerivativeDetails">
        <link:definition>0000067 - Disclosure - Fair Value Measurements - Roll Forward of Preferred Stock Derivative (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="FairValueMeasurementsEffectofInterestRateSwapDetails" roleURI="http://www.nninc.com/role/FairValueMeasurementsEffectofInterestRateSwapDetails">
        <link:definition>0000068 - Disclosure - Fair Value Measurements - Effect of Interest Rate Swap (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="FairValueMeasurementsInterestRateSwapDetails" roleURI="http://www.nninc.com/role/FairValueMeasurementsInterestRateSwapDetails">
        <link:definition>0000069 - Disclosure - Fair Value Measurements - Interest Rate Swap (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="FairValueMeasurementsNotionalAmountsoftheInterestRateSwapDetails" roleURI="http://www.nninc.com/role/FairValueMeasurementsNotionalAmountsoftheInterestRateSwapDetails">
        <link:definition>0000070 - Disclosure - Fair Value Measurements - Notional Amounts of the Interest Rate Swap (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="SubsequentEventsDetails" roleURI="http://www.nninc.com/role/SubsequentEventsDetails">
        <link:definition>0000071 - Disclosure - Subsequent Events (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
    </xs:appinfo>
  </xs:annotation>
  <xs:element id="nnbr_ContractClaimsMember" abstract="true" name="ContractClaimsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="nnbr_OtherEndMarketMember" abstract="true" name="OtherEndMarketMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="nnbr_FederalFundsOrPrimeRateMember" abstract="true" name="FederalFundsOrPrimeRateMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="nnbr_InterestRateSwapDecember312021toOctober192022Member" abstract="true" name="InterestRateSwapDecember312021toOctober192022Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="nnbr_PreferredStockRemainingInFuturePeriodsProbabilityPercentage" abstract="false" name="PreferredStockRemainingInFuturePeriodsProbabilityPercentage" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
  <xs:element id="nnbr_TemporaryEquityDividendRatePercentage" abstract="false" name="TemporaryEquityDividendRatePercentage" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
  <xs:element id="nnbr_February82019Member" abstract="true" name="February82019Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="nnbr_TemporaryEquityDividendsWithholdingsOffsetFromPurchasersUponRedemption" abstract="false" name="TemporaryEquityDividendsWithholdingsOffsetFromPurchasersUponRedemption" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="nnbr_DebtInstrumentLIBORFloorRate" abstract="false" name="DebtInstrumentLIBORFloorRate" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
  <xs:element id="nnbr_MobileSolutionsMember" abstract="true" name="MobileSolutionsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="nnbr_SecuritiesOfferingMatterMember" abstract="true" name="SecuritiesOfferingMatterMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="nnbr_ShareBasedCompensationArrangementByShareBasedPaymentAwardPercentageOfSharesIssuableBasedOnThresholdPerformance" abstract="false" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardPercentageOfSharesIssuableBasedOnThresholdPerformance" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
  <xs:element id="nnbr_AdjustmentstoAdditionalPaidinCapitalAdjustmentstoPerformanceSharesVestingEstimates" abstract="false" name="AdjustmentstoAdditionalPaidinCapitalAdjustmentstoPerformanceSharesVestingEstimates" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="nnbr_NonExecutiveDirectorsMember" abstract="true" name="NonExecutiveDirectorsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="nnbr_PaymentsForTemporaryEquityRedemption" abstract="false" name="PaymentsForTemporaryEquityRedemption" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="nnbr_GainLossOnDerivativesAndOtherNonoperatingIncomeExpenseNet" abstract="false" name="GainLossOnDerivativesAndOtherNonoperatingIncomeExpenseNet" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="nnbr_WuxiWeifuAutocamPrecisionMachineryCompanyLtdMember" abstract="true" name="WuxiWeifuAutocamPrecisionMachineryCompanyLtdMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="nnbr_MajorCustomerMember" abstract="true" name="MajorCustomerMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="nnbr_TemporaryEquityLiquidationPreferencePercentage" abstract="false" name="TemporaryEquityLiquidationPreferencePercentage" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
  <xs:element id="nnbr_AntiDilutiveSecuritiesExcludedFromComputationOfEarningsPerShareMaximumPriceRangeOne" abstract="false" name="AntiDilutiveSecuritiesExcludedFromComputationOfEarningsPerShareMaximumPriceRangeOne" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:perShareItemType"/>
  <xs:element id="nnbr_VariousBenchmarkRatesMemberMember" abstract="true" name="VariousBenchmarkRatesMemberMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="nnbr_ScheduleOfPerformanceUnitAwardsBasedOnExpectedPerformanceTableTextBlock" abstract="false" name="ScheduleOfPerformanceUnitAwardsBasedOnExpectedPerformanceTableTextBlock" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:textBlockItemType"/>
  <xs:element id="nnbr_DerivativeInstrumentsPaymentExpense" abstract="false" name="DerivativeInstrumentsPaymentExpense" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="nnbr_WeightedAverageNumberOfCommonSharesOutstandingDiluted" abstract="false" name="WeightedAverageNumberOfCommonSharesOutstandingDiluted" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:sharesItemType"/>
  <xs:element id="nnbr_AOCIAttributableToParentTaxPortionMember" abstract="true" name="AOCIAttributableToParentTaxPortionMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="nnbr_TemporaryEquityDividendRatePercentageIncreaseIfNoDividendPaid" abstract="false" name="TemporaryEquityDividendRatePercentageIncreaseIfNoDividendPaid" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
  <xs:element id="nnbr_PowerSolutionsMember" abstract="true" name="PowerSolutionsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="nnbr_ElectricalMember" abstract="true" name="ElectricalMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="nnbr_LossOnInterestRateSwapMember" abstract="true" name="LossOnInterestRateSwapMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="nnbr_AdjustmentsRelatedToTaxWithholdingAndForfeitedForShareBasedCompensation" abstract="false" name="AdjustmentsRelatedToTaxWithholdingAndForfeitedForShareBasedCompensation" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="nnbr_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardPerformancePeriod" abstract="false" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardPerformancePeriod" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:durationItemType"/>
  <xs:element id="nnbr_TemporaryEquityRedemption" abstract="false" name="TemporaryEquityRedemption" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="nnbr_EquityMethodInvestmentForeignCurrencyTranslationGain" abstract="false" name="EquityMethodInvestmentForeignCurrencyTranslationGain" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="nnbr_PerformanceSharesReturnOnInvestedCapitalMember" abstract="true" name="PerformanceSharesReturnOnInvestedCapitalMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="nnbr_ShareBasedCompensationArrangementByShareBasedPaymentAwardBasedOnThresholdPerformanceAchievementPercentage" abstract="false" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardBasedOnThresholdPerformanceAchievementPercentage" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
  <xs:element id="nnbr_SharesPaidForTaxWithholdingAndForfeitedForShareBasedCompensation" abstract="false" name="SharesPaidForTaxWithholdingAndForfeitedForShareBasedCompensation" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:sharesItemType"/>
  <xs:element id="nnbr_TaxMatterMember" abstract="true" name="TaxMatterMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="nnbr_AdjustmentsToAdditionalPaidInCapitalAdjustmentsToPerformanceSharesVestingEstimates" abstract="false" name="AdjustmentsToAdditionalPaidInCapitalAdjustmentsToPerformanceSharesVestingEstimates" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="nnbr_EquityMethodInvestmentsRollForward" abstract="true" name="EquityMethodInvestmentsRollForward" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
  <xs:element id="nnbr_AntiDilutiveSecuritiesExcludedFromComputationOfEarningsPerShareMinimumPriceRange" abstract="false" name="AntiDilutiveSecuritiesExcludedFromComputationOfEarningsPerShareMinimumPriceRange" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:perShareItemType"/>
  <xs:element id="nnbr_OtherCountryMember" abstract="true" name="OtherCountryMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="nnbr_ShareBasedCompensationArrangementBySharebasedPaymentAwardPercentageOfSharesIssuableBasedOnTargetPerformance" abstract="false" name="ShareBasedCompensationArrangementBySharebasedPaymentAwardPercentageOfSharesIssuableBasedOnTargetPerformance" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
  <xs:element id="nnbr_IncreaseDecreaseInOperatingLeaseRightofUseAsset" abstract="false" name="IncreaseDecreaseInOperatingLeaseRightofUseAsset" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="nnbr_ClassOfWarrantOrRightAdjustedExercisePriceOfWarrantsOrRights" abstract="false" name="ClassOfWarrantOrRightAdjustedExercisePriceOfWarrantsOrRights" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="dtr-types:perShareItemType"/>
  <xs:element id="nnbr_AutomotiveMember" abstract="true" name="AutomotiveMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="nnbr_InterestRateSwapDecember312020toDecember302021Member" abstract="true" name="InterestRateSwapDecember312020toDecember302021Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="nnbr_ShareBasedCompensationArrangementBySharebasedPaymentAwardBasedOnMaximumPerformanceAchievementPercentage" abstract="false" name="ShareBasedCompensationArrangementBySharebasedPaymentAwardBasedOnMaximumPerformanceAchievementPercentage" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
  <xs:element id="nnbr_IncreaseDecreaseInChangeBetweenOperatingLeaseRightofUseAssetsandOperatingLeaseLiabilitiesNet" abstract="false" name="IncreaseDecreaseInChangeBetweenOperatingLeaseRightofUseAssetsandOperatingLeaseLiabilitiesNet" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="nnbr_TemporaryEquityFairValueOfWarrantsIssued" abstract="false" name="TemporaryEquityFairValueOfWarrantsIssued" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="nnbr_July222021Member" abstract="true" name="July222021Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="nnbr_FederalFundsOrPrimeRateMemberMember" abstract="true" name="FederalFundsOrPrimeRateMemberMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="nnbr_PreferredStockPutFeatureExercisableProbabilityPercentage" abstract="false" name="PreferredStockPutFeatureExercisableProbabilityPercentage" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
  <xs:element id="nnbr_ChangeinEstimateofPerformanceSharesMember" abstract="true" name="ChangeinEstimateofPerformanceSharesMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="nnbr_ShareBasedCompensationArrangementBySharebasedPaymentAwardBasedOnTargetPerformanceAchievementPercentage" abstract="false" name="ShareBasedCompensationArrangementBySharebasedPaymentAwardBasedOnTargetPerformanceAchievementPercentage" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
  <xs:element id="nnbr_TemporaryEquityDividendRatePercentageAnnualIncrease" abstract="false" name="TemporaryEquityDividendRatePercentageAnnualIncrease" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
  <xs:element id="nnbr_GeneralIndustrialMember" abstract="true" name="GeneralIndustrialMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="nnbr_TemporaryEquityDividendsUnpaidDeemed" abstract="false" name="TemporaryEquityDividendsUnpaidDeemed" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="nnbr_IncreaseDecreaseInOperatingLeaseLiabilityNoncurrent" abstract="false" name="IncreaseDecreaseInOperatingLeaseLiabilityNoncurrent" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="nnbr_TermLoanFacilityMemberMember" abstract="true" name="TermLoanFacilityMemberMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="nnbr_WeightedAverageNumberOfCommonSharesOutstandingBasic" abstract="false" name="WeightedAverageNumberOfCommonSharesOutstandingBasic" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:sharesItemType"/>
  <xs:element id="nnbr_TemporaryEquityDividendsWithholdingsNetCashDistribution" abstract="false" name="TemporaryEquityDividendsWithholdingsNetCashDistribution" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="nnbr_ShareBasedCompensationArrangementBySharebasedPaymentAwardPercentageOfSharesIssuableBasedOnMaximumPerformance" abstract="false" name="ShareBasedCompensationArrangementBySharebasedPaymentAwardPercentageOfSharesIssuableBasedOnMaximumPerformance" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
  <xs:element id="nnbr_InterestRateSwapFebruary122019toDecember302020Member" abstract="true" name="InterestRateSwapFebruary122019toDecember302020Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="nnbr_CorporateAndEliminationsMember" abstract="true" name="CorporateAndEliminationsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="nnbr_DisposalGroupIncludingDiscontinuedOperationsGoodwillImpairmentLoss" abstract="false" name="DisposalGroupIncludingDiscontinuedOperationsGoodwillImpairmentLoss" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="nnbr_IncreaseDecreaseInOperatingLeaseLiabilityCurrent" abstract="false" name="IncreaseDecreaseInOperatingLeaseLiabilityCurrent" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="nnbr_PerformanceSharesTsrAwardsMember" abstract="true" name="PerformanceSharesTsrAwardsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="nnbr_SeniorSecuredRevolvingFacilityMember" abstract="true" name="SeniorSecuredRevolvingFacilityMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="nnbr_TemporaryEquityRecognitionOfBifurcatedEmbeddedDerivative" abstract="false" name="TemporaryEquityRecognitionOfBifurcatedEmbeddedDerivative" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="nnbr_CashFlowLesseeAbstract" abstract="true" name="CashFlowLesseeAbstract" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
  <xs:element id="nnbr_SeriesBConvertiblePreferredStockMember" abstract="true" name="SeriesBConvertiblePreferredStockMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="nnbr_AssetBackedCreditFacilityMemberMember" abstract="true" name="AssetBackedCreditFacilityMemberMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="nnbr_PreferredStockChangeInControlPutFeatureProbabilityPercentage" abstract="false" name="PreferredStockChangeInControlPutFeatureProbabilityPercentage" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
  <xs:element id="nnbr_EmployeesMember" abstract="true" name="EmployeesMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="nnbr_VariousBenchmarkRatesMember" abstract="true" name="VariousBenchmarkRatesMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
</xs:schema>
