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      <link:roleType id="LeasesSupplementalCashFlowInformationDetails" roleURI="http://www.nnbr.com/role/LeasesSupplementalCashFlowInformationDetails">
        <link:definition>2410404 - Disclosure - Leases - Supplemental Cash Flow Information (Details)</link:definition>
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        <link:usedOn>link:calculationLink</link:usedOn>
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      <link:roleType id="LeasesTables" roleURI="http://www.nnbr.com/role/LeasesTables">
        <link:definition>2310301 - Disclosure - Leases (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
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      <link:roleType id="LeasesWeightedAverageRemainingLeaseTermAndDiscountRateDetails" roleURI="http://www.nnbr.com/role/LeasesWeightedAverageRemainingLeaseTermAndDiscountRateDetails">
        <link:definition>2410405 - Disclosure - Leases - Weighted Average Remaining Lease Term and Discount Rate (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="NetIncomeLossPerShare" roleURI="http://www.nnbr.com/role/NetIncomeLossPerShare">
        <link:definition>2115100 - Disclosure - Net Income (Loss) Per Share</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
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      <link:roleType id="NetIncomeLossPerShareAdditionalInformationDetail" roleURI="http://www.nnbr.com/role/NetIncomeLossPerShareAdditionalInformationDetail">
        <link:definition>2415403 - Disclosure - Net Income (Loss) Per Share - Additional Information (Detail)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
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      <link:roleType id="NetIncomeLossPerShareSummaryOfNetIncomeLossPerShareDetail" roleURI="http://www.nnbr.com/role/NetIncomeLossPerShareSummaryOfNetIncomeLossPerShareDetail">
        <link:definition>2415402 - Disclosure - Net Income (Loss) Per 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="NetIncomeLossPerShareTables" roleURI="http://www.nnbr.com/role/NetIncomeLossPerShareTables">
        <link:definition>2315301 - Disclosure - Net Income (Loss) Per Share (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
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      <link:roleType id="RestructuringAndIntegration" roleURI="http://www.nnbr.com/role/RestructuringAndIntegration">
        <link:definition>2111100 - Disclosure - Restructuring and Integration</link:definition>
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        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
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      <link:roleType id="RestructuringAndIntegrationAdditionalInformationDetail" roleURI="http://www.nnbr.com/role/RestructuringAndIntegrationAdditionalInformationDetail">
        <link:definition>2411403 - Disclosure - Restructuring and Integration - Additional Information (Detail)</link:definition>
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        <link:usedOn>link:calculationLink</link:usedOn>
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      <link:roleType id="RestructuringAndIntegrationSummaryOfRestructuringAndIntegrationChargesAndReserveActivityDetail" roleURI="http://www.nnbr.com/role/RestructuringAndIntegrationSummaryOfRestructuringAndIntegrationChargesAndReserveActivityDetail">
        <link:definition>2411402 - Disclosure - Restructuring and Integration - Summary of Restructuring and Integration Charges and Reserve Activity (Detail)</link:definition>
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        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
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      <link:roleType id="RestructuringAndIntegrationTables" roleURI="http://www.nnbr.com/role/RestructuringAndIntegrationTables">
        <link:definition>2311301 - Disclosure - Restructuring and Integration (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
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      <link:roleType id="RevenueFromContractsWithCustomers" roleURI="http://www.nnbr.com/role/RevenueFromContractsWithCustomers">
        <link:definition>2113100 - 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>
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      <link:roleType id="RevenueFromContractsWithCustomersAdditionalInformationDetails" roleURI="http://www.nnbr.com/role/RevenueFromContractsWithCustomersAdditionalInformationDetails">
        <link:definition>2413404 - 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>
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      <link:roleType id="RevenueFromContractsWithCustomersSummaryOfContractLiabilitiesFromContractsWithCustomersDetail" roleURI="http://www.nnbr.com/role/RevenueFromContractsWithCustomersSummaryOfContractLiabilitiesFromContractsWithCustomersDetail">
        <link:definition>2413403 - 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>
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      <link:roleType id="RevenueFromContractsWithCustomersSummaryOfRevenueFromContractsWithCustomersDetail" roleURI="http://www.nnbr.com/role/RevenueFromContractsWithCustomersSummaryOfRevenueFromContractsWithCustomersDetail">
        <link:definition>2413402 - 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>
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      <link:roleType id="RevenueFromContractsWithCustomersTables" roleURI="http://www.nnbr.com/role/RevenueFromContractsWithCustomersTables">
        <link:definition>2313301 - 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>
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      <link:roleType id="SegmentInformation" roleURI="http://www.nnbr.com/role/SegmentInformation">
        <link:definition>2103100 - Disclosure - Segment Information</link:definition>
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        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="SegmentInformationDetail" roleURI="http://www.nnbr.com/role/SegmentInformationDetail">
        <link:definition>2403402 - Disclosure - Segment 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="SegmentInformationTables" roleURI="http://www.nnbr.com/role/SegmentInformationTables">
        <link:definition>2303301 - Disclosure - Segment Information (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
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      <link:roleType id="SharedBasedCompensation" roleURI="http://www.nnbr.com/role/SharedBasedCompensation">
        <link:definition>2114100 - Disclosure - Shared-Based Compensation</link:definition>
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        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
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      <link:roleType id="SharedBasedCompensationAdditionalInformationDetail" roleURI="http://www.nnbr.com/role/SharedBasedCompensationAdditionalInformationDetail">
        <link:definition>2414403 - 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>
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      <link:roleType id="SharedBasedCompensationComponentsOfShareBasedCompensationExpenseByTypeOfAwardDetail" roleURI="http://www.nnbr.com/role/SharedBasedCompensationComponentsOfShareBasedCompensationExpenseByTypeOfAwardDetail">
        <link:definition>2414402 - 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>
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      <link:roleType id="SharedBasedCompensationReconciliationOfOptionActivityDetail" roleURI="http://www.nnbr.com/role/SharedBasedCompensationReconciliationOfOptionActivityDetail">
        <link:definition>2414405 - Disclosure - Shared-Based Compensation - Reconciliation of Option Activity (Detail)</link:definition>
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        <link:usedOn>link:calculationLink</link:usedOn>
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      <link:roleType id="SharedBasedCompensationReconciliationOfRestrictedStockOptionActivityDetail" roleURI="http://www.nnbr.com/role/SharedBasedCompensationReconciliationOfRestrictedStockOptionActivityDetail">
        <link:definition>2414406 - Disclosure - Shared-Based Compensation - Reconciliation of Restricted Stock Option Activity (Detail)</link:definition>
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        <link:usedOn>link:calculationLink</link:usedOn>
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      <link:roleType id="SharedBasedCompensationScheduleOfPerformanceBasedAwardsGoalsWithRespectToTsrAndRoicDetail" roleURI="http://www.nnbr.com/role/SharedBasedCompensationScheduleOfPerformanceBasedAwardsGoalsWithRespectToTsrAndRoicDetail">
        <link:definition>2414407 - Disclosure - Shared-Based Compensation - Schedule of Performance Based Awards Goals with Respect to TSR and ROIC (Detail)</link:definition>
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        <link:usedOn>link:calculationLink</link:usedOn>
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      <link:roleType id="SharedBasedCompensationSummaryOfNumberOfAwardsGrantedAndGrandDateFairValueDetail" roleURI="http://www.nnbr.com/role/SharedBasedCompensationSummaryOfNumberOfAwardsGrantedAndGrandDateFairValueDetail">
        <link:definition>2414408 - Disclosure - Shared-Based Compensation - Summary of Number of Awards Granted and Grand Date Fair Value (Detail)</link:definition>
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        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
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      <link:roleType id="SharedBasedCompensationTables" roleURI="http://www.nnbr.com/role/SharedBasedCompensationTables">
        <link:definition>2314301 - Disclosure - Shared-Based Compensation (Tables)</link:definition>
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        <link:usedOn>link:calculationLink</link:usedOn>
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      <link:roleType id="SharedBasedCompensationWeightedAverageAssumptionsRelevantToDeterminingFairValueAtDatesOfGrantAndStockOptionModificationDetail" roleURI="http://www.nnbr.com/role/SharedBasedCompensationWeightedAverageAssumptionsRelevantToDeterminingFairValueAtDatesOfGrantAndStockOptionModificationDetail">
        <link:definition>2414404 - Disclosure - Shared-Based Compensation - Weighted Average Assumptions Relevant to Determining the Fair Value at the Dates of Grant and Stock Option Modification (Detail)</link:definition>
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      <link:roleType id="SubsequentEvents" roleURI="http://www.nnbr.com/role/SubsequentEvents">
        <link:definition>2117100 - Disclosure - Subsequent Events</link:definition>
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  <xsd:element abstract="true" id="nnbr_SouthernCaliforniaTechnicalArtsInc.Member" name="SouthernCaliforniaTechnicalArtsInc.Member" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="nnbr_TaxCutsAndJobsActOf2017ChangeInTaxRateIncomeTaxExpenseBenefit" name="TaxCutsAndJobsActOf2017ChangeInTaxRateIncomeTaxExpenseBenefit" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="nnbr_WeightedAverageRemainingLeaseTermAbstract" name="WeightedAverageRemainingLeaseTermAbstract" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="nnbr_WuxiWeifuAutocamPrecisionMachineryCompanyLtdMember" name="WuxiWeifuAutocamPrecisionMachineryCompanyLtdMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
</xsd:schema>
