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  <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_PaymentsForTemporaryEquityRedemption" abstract="false" name="PaymentsForTemporaryEquityRedemption" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <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_TemporaryEquityRecognitionOfBifurcatedEmbeddedDerivative" abstract="false" name="TemporaryEquityRecognitionOfBifurcatedEmbeddedDerivative" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <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_InterestRateSwapDecember312020toDecember302021Member" abstract="true" name="InterestRateSwapDecember312020toDecember302021Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="nnbr_CashFlowLesseeAbstract" abstract="true" name="CashFlowLesseeAbstract" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
  <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_SharesPaidForTaxWithholdingAndForfeitedForShareBasedCompensation" abstract="false" name="SharesPaidForTaxWithholdingAndForfeitedForShareBasedCompensation" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:sharesItemType"/>
  <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_InterestRateSwapFebruary122019toDecember302020Member" abstract="true" name="InterestRateSwapFebruary122019toDecember302020Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
</xs:schema>
