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  <xs:element id="nnbr_NonExecutiveDirectorsMember" abstract="true" name="NonExecutiveDirectorsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="nnbr_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardPerformancePeriod" abstract="false" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardPerformancePeriod" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:durationItemType"/>
  <xs:element id="nnbr_ShareBasedCompensationArrangementByShareBasedPaymentAwardPercentageOfSharesIssuableBasedOnThresholdPerformance" abstract="false" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardPercentageOfSharesIssuableBasedOnThresholdPerformance" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:percentItemType"/>
  <xs:element id="nnbr_ShareBasedCompensationArrangementBySharebasedPaymentAwardPercentageOfSharesIssuableBasedOnTargetPerformance" abstract="false" name="ShareBasedCompensationArrangementBySharebasedPaymentAwardPercentageOfSharesIssuableBasedOnTargetPerformance" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:percentItemType"/>
  <xs:element id="nnbr_ShareBasedCompensationArrangementBySharebasedPaymentAwardPercentageOfSharesIssuableBasedOnMaximumPerformance" abstract="false" name="ShareBasedCompensationArrangementBySharebasedPaymentAwardPercentageOfSharesIssuableBasedOnMaximumPerformance" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:percentItemType"/>
  <xs:element id="nnbr_AOCIAttributableToParentTaxPortionMember" abstract="true" name="AOCIAttributableToParentTaxPortionMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="nnbr_LossOnInterestRateSwapMember" abstract="true" name="LossOnInterestRateSwapMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="nnbr_SeriesBConvertiblePreferredStockMember" abstract="true" name="SeriesBConvertiblePreferredStockMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <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_TemporaryEquityDividendsWithholdingsOffsetFromPurchasersUponRedemption" abstract="false" name="TemporaryEquityDividendsWithholdingsOffsetFromPurchasersUponRedemption" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="nnbr_TemporaryEquityLiquidationPreferencePercentage" abstract="false" name="TemporaryEquityLiquidationPreferencePercentage" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="dtr-types1:percentItemType"/>
  <xs:element id="nnbr_PreferredStockChangeInControlPutFeatureProbabilityPercentage" abstract="false" name="PreferredStockChangeInControlPutFeatureProbabilityPercentage" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:percentItemType"/>
  <xs:element id="nnbr_PreferredStockRemainingInFuturePeriodsProbabilityPercentage" abstract="false" name="PreferredStockRemainingInFuturePeriodsProbabilityPercentage" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:percentItemType"/>
  <xs:element id="nnbr_PreferredStockPutFeatureExercisableProbabilityPercentage" abstract="false" name="PreferredStockPutFeatureExercisableProbabilityPercentage" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:percentItemType"/>
  <xs:element id="nnbr_ContingentlyIssuableWarrants" abstract="false" name="ContingentlyIssuableWarrants" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="xbrli:integerItemType"/>
  <xs:element id="nnbr_InterestRateSwapFebruary122019toDecember302020Member" abstract="true" name="InterestRateSwapFebruary122019toDecember302020Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="nnbr_InterestRateSwapDecember312020toDecember302021Member" abstract="true" name="InterestRateSwapDecember312020toDecember302021Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="nnbr_InterestRateSwapDecember312021toOctober192022Member" abstract="true" name="InterestRateSwapDecember312021toOctober192022Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="nnbr_IndustrialMoldingCorporationMember" abstract="true" name="IndustrialMoldingCorporationMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="nnbr_NetAssetsDisposed" abstract="false" name="NetAssetsDisposed" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="nnbr_DisposalGroupIncludingDiscontinuedOperationTransactionCosts" abstract="false" name="DisposalGroupIncludingDiscontinuedOperationTransactionCosts" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="nnbr_PlantOptimizationActivitiesMember" abstract="true" name="PlantOptimizationActivitiesMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="nnbr_MachineryAndEquipmentNet" abstract="false" name="MachineryAndEquipmentNet" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="nnbr_PostemploymentBenefitsTotalExpense" abstract="false" name="PostemploymentBenefitsTotalExpense" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
</xs:schema>
