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  <xs:element id="mli_OtherComprehensiveIncomeLossAttributableToUnconsolidatedAffiliatesTax" abstract="false" name="OtherComprehensiveIncomeLossAttributableToUnconsolidatedAffiliatesTax" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="mli_InvestmentReceivedFromNoncontrollingInterests" abstract="false" name="InvestmentReceivedFromNoncontrollingInterests" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="mli_ProceedsFromIssuanceRepaymentsOfDebtByConsolidatedJointVentures" abstract="false" name="ProceedsFromIssuanceRepaymentsOfDebtByConsolidatedJointVentures" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="mli_PaymentsForSettlementOfStockBasedAwards" abstract="false" name="PaymentsForSettlementOfStockBasedAwards" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="mli_InvestmentInJointVenture" abstract="false" name="InvestmentInJointVenture" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="mli_ElkhartProductsCorporationMember" abstract="true" name="ElkhartProductsCorporationMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="mli_NehringElectricalWorksCompanyMember" abstract="true" name="NehringElectricalWorksCompanyMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="mli_NumberOfManufacturingLocations" abstract="false" name="NumberOfManufacturingLocations" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="xbrli:integerItemType"/>
  <xs:element id="mli_TubeAndFittingsMember" abstract="true" name="TubeAndFittingsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="mli_BrassRodAndForgingsMember" abstract="true" name="BrassRodAndForgingsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="mli_OEMComponentsTubeAndAssembliesMember" abstract="true" name="OEMComponentsTubeAndAssembliesMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="mli_ValvesAndPlumbingSpecialtiesMember" abstract="true" name="ValvesAndPlumbingSpecialtiesMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="mli_FlexDuctAndOtherHVACComponentsMember" abstract="true" name="FlexDuctAndOtherHVACComponentsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="mli_OtherProductsMember" abstract="true" name="OtherProductsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="mli_PipingSystemsMember" abstract="true" name="PipingSystemsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="mli_IndustrialMetalsMember" abstract="true" name="IndustrialMetalsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="mli_ClimateMember" abstract="true" name="ClimateMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="mli_OperatingIncomeLossExcludingCorporate" abstract="false" name="OperatingIncomeLossExcludingCorporate" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="mli_TimePeriodForOpenCopperFutureContract" abstract="false" name="TimePeriodForOpenCopperFutureContract" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:durationItemType"/>
  <xs:element id="mli_GainLossOnFairValueOfFutureContracts" abstract="false" name="GainLossOnFairValueOfFutureContracts" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="mli_AccumulatedOtherComprehensiveIncomeLossCumulativeChangesInNetGainLossFromDerivativeInstrumentsEffectNetOfTax" abstract="false" name="AccumulatedOtherComprehensiveIncomeLossCumulativeChangesInNetGainLossFromDerivativeInstrumentsEffectNetOfTax" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="mli_OpenOptionContractsPutAtFairValue" abstract="false" name="OpenOptionContractsPutAtFairValue" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="mli_TimePeriodForOpenCopperFutureContractSales" abstract="false" name="TimePeriodForOpenCopperFutureContractSales" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:durationItemType"/>
  <xs:element id="mli_TecumsehProductsHoldingsLLCMember" abstract="true" name="TecumsehProductsHoldingsLLCMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="mli_RetailDistributionBusinessMember" abstract="true" name="RetailDistributionBusinessMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="mli_CapitalContributionMember" abstract="true" name="CapitalContributionMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="mli_SoutheastKansasSitesMember" abstract="true" name="SoutheastKansasSitesMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="mli_SoutheastKansasSitesLanyonMember" abstract="true" name="SoutheastKansasSitesLanyonMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="mli_ShastaAreaMineSitesMember" abstract="true" name="ShastaAreaMineSitesMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="mli_LeadRefinerySiteMember" abstract="true" name="LeadRefinerySiteMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="mli_LeadRefineryNPLSiteMember" abstract="true" name="LeadRefineryNPLSiteMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="mli_BonitaPeakMiningDistrictMember" abstract="true" name="BonitaPeakMiningDistrictMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="mli_MuellerCopperTubeProductsIncMember" abstract="true" name="MuellerCopperTubeProductsIncMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="mli_NonOperatingPropertiesMember" abstract="true" name="NonOperatingPropertiesMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="mli_OperatingPropertiesMember" abstract="true" name="OperatingPropertiesMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="mli_NumberOfFormerSmelterSites" abstract="false" name="NumberOfFormerSmelterSites" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="xbrli:integerItemType"/>
  <xs:element id="mli_GeographicBoundaryOfSites" abstract="false" name="GeographicBoundaryOfSites" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:integerItemType"/>
  <xs:element id="mli_NumberOfPartiesInvolvedInSettlementNegotiations" abstract="false" name="NumberOfPartiesInvolvedInSettlementNegotiations" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="xbrli:integerItemType"/>
  <xs:element id="mli_NumberOfPropertiesInRemediation" abstract="false" name="NumberOfPropertiesInRemediation" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="xbrli:integerItemType"/>
  <xs:element id="mli_NumberOfSurroundingProperties" abstract="false" name="NumberOfSurroundingProperties" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:integerItemType"/>
  <xs:element id="mli_PeriodOfPermitImplementationOfBestManagementPractices" abstract="false" name="PeriodOfPermitImplementationOfBestManagementPractices" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:durationItemType"/>
  <xs:element id="mli_SiteContingencyEstimatedTimeFrameToResolveContingency1" abstract="false" name="SiteContingencyEstimatedTimeFrameToResolveContingency1" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:durationItemType"/>
  <xs:element id="mli_SiteContingencyPropertiesLossExposureNotAccruedBestEstimate" abstract="false" name="SiteContingencyPropertiesLossExposureNotAccruedBestEstimate" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="mli_SiteContingencyEnvironmentalRemedialandFeasibilityStudyFinancialGuarantee" abstract="false" name="SiteContingencyEnvironmentalRemedialandFeasibilityStudyFinancialGuarantee" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="mli_SiteContingencyNumberOfUnilateralAdministrativeOrders" abstract="false" name="SiteContingencyNumberOfUnilateralAdministrativeOrders" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:integerItemType"/>
  <xs:element id="mli_SiteContingencyNumberOfPotentiallyResponsibleParties" abstract="false" name="SiteContingencyNumberOfPotentiallyResponsibleParties" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:integerItemType"/>
  <xs:element id="mli_SiteContingencyTotalCostForAllPartiesBestEstimate" abstract="false" name="SiteContingencyTotalCostForAllPartiesBestEstimate" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="mli_SiteContingencyReimbursementCostsToThirdPartiesForPastCosts" abstract="false" name="SiteContingencyReimbursementCostsToThirdPartiesForPastCosts" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="mli_SiteContingencyAdditionalReimbursementCostsToThirdPartiesForPastCosts" abstract="false" name="SiteContingencyAdditionalReimbursementCostsToThirdPartiesForPastCosts" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="mli_NumberOfMiningSites" abstract="false" name="NumberOfMiningSites" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:integerItemType"/>
  <xs:element id="mli_AssignmentOfAntidumpingDutyRateOnUSImportsByCompanySubsidiaries" abstract="false" name="AssignmentOfAntidumpingDutyRateOnUSImportsByCompanySubsidiaries" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
  <xs:element id="mli_PaymentForInterestAndDuties" abstract="false" name="PaymentForInterestAndDuties" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="mli_NumberOfImportEntries" abstract="false" name="NumberOfImportEntries" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:integerItemType"/>
  <xs:element id="mli_TermOfGuarantees" abstract="false" name="TermOfGuarantees" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:durationItemType"/>
  <xs:element id="mli_EffectiveIncomeTaxRateReconciliationOtherItemsAmount" abstract="false" name="EffectiveIncomeTaxRateReconciliationOtherItemsAmount" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="mli_EffectiveIncomeTaxRateReconciliationOtherAdjustmentAmount" abstract="false" name="EffectiveIncomeTaxRateReconciliationOtherAdjustmentAmount" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="mli_AccumulatedOtherComprehensiveIncomeAttributabletoUnconsolidatedAffiliatesMember" abstract="true" name="AccumulatedOtherComprehensiveIncomeAttributabletoUnconsolidatedAffiliatesMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="mli_InsuredEventGainLossPretax" abstract="false" name="InsuredEventGainLossPretax" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="mli_JeffreyMartinMember" abstract="true" name="JeffreyMartinMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
</xs:schema>
