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<!-- DFIN ActiveDisclosure(SM) XBRL Schema Document - http://www.dfinsolutions.com/ -->
<!-- Creation Date      : 2021-08-26T12:08:14.0710905+00:00 -->
<!-- Version            : 5.0.1.648 -->
<!-- Package ID         : 2b1d11d7e4994a3a9c52e7e969aec8bb -->
<!-- Copyright (c) 2021 Donnelley Financial Solutions, Inc. All Rights Reserved. -->
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  <xsd:element id="strt_StrattecSecurityCorporationMember" name="StrattecSecurityCorporationMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="strt_MindaVastAccessSystemsMember" name="MindaVastAccessSystemsMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="strt_ADACSTRATTECLLCMember" name="ADACSTRATTECLLCMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="strt_ImpairmentChangeOfEquityMethodInvestment" name="ImpairmentChangeOfEquityMethodInvestment" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit" />
  <xsd:element id="strt_PercentageOwnershipInterestInLessThanWhollyOwnedConsolidatedSubsidiary" name="PercentageOwnershipInterestInLessThanWhollyOwnedConsolidatedSubsidiary" type="num:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" />
  <xsd:element id="strt_OperatingExpensePaidToRelatedParty" name="OperatingExpensePaidToRelatedParty" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit" />
  <xsd:element id="strt_MajorityOwnedSubsidiariesImpactOnNetIncome" name="MajorityOwnedSubsidiariesImpactOnNetIncome" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="credit" />
  <xsd:element id="strt_IncomeLossFromEquityMethodInvestmentBeforeIntercompanyProfitEliminations" name="IncomeLossFromEquityMethodInvestmentBeforeIntercompanyProfitEliminations" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="credit" />
  <xsd:element id="strt_EquityMethodInvestmentUnrealizedIntercompanyProfitLossEliminatedAmount" name="EquityMethodInvestmentUnrealizedIntercompanyProfitLossEliminatedAmount" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="credit" />
  <xsd:element id="strt_EquityMethodInvestmentSummarizedFinancialInformationCostOfSalesNetOfRecoveries" name="EquityMethodInvestmentSummarizedFinancialInformationCostOfSalesNetOfRecoveries" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit" />
  <xsd:element id="strt_EquityMethodInvestmentsSummarizedFinancialInformationCashAndCashEquivalents" name="EquityMethodInvestmentsSummarizedFinancialInformationCashAndCashEquivalents" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="debit" />
  <xsd:element id="strt_EquityMethodInvestmentsSummarizedFinancialInformationNetAccountsReceivable" name="EquityMethodInvestmentsSummarizedFinancialInformationNetAccountsReceivable" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="debit" />
  <xsd:element id="strt_EquityMethodInvestmentsSummarizedFinancialInformationNetInventories" name="EquityMethodInvestmentsSummarizedFinancialInformationNetInventories" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="debit" />
  <xsd:element id="strt_EquityMethodInvestmentsSummarizedFinancialInformationOtherCurrentAssets" name="EquityMethodInvestmentsSummarizedFinancialInformationOtherCurrentAssets" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="debit" />
  <xsd:element id="strt_EquityMethodInvestmentsSummarizedFinancialInformationCurrentAssets" name="EquityMethodInvestmentsSummarizedFinancialInformationCurrentAssets" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="debit" />
  <xsd:element id="strt_EquityMethodInvestmentsSummarizedFinancialInformationPropertyPlantAndEquipment" name="EquityMethodInvestmentsSummarizedFinancialInformationPropertyPlantAndEquipment" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="debit" />
  <xsd:element id="strt_EquityMethodInvestmentsSummarizedFinancialInformationOtherNoncurrentAssets" name="EquityMethodInvestmentsSummarizedFinancialInformationOtherNoncurrentAssets" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="debit" />
  <xsd:element id="strt_EquityMethodInvestmentSummarizedFinancialInformationTotalAssets" name="EquityMethodInvestmentSummarizedFinancialInformationTotalAssets" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="debit" />
  <xsd:element id="strt_EquityMethodInvestmentSummarizedFinancialInformationCurrentDebt" name="EquityMethodInvestmentSummarizedFinancialInformationCurrentDebt" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="credit" />
  <xsd:element id="strt_EquityMethodInvestmentSummarizedFinancialInformationOtherCurrentLiabilities" name="EquityMethodInvestmentSummarizedFinancialInformationOtherCurrentLiabilities" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="credit" />
  <xsd:element id="strt_EquityMethodInvestmentSummarizedFinancialInformationLongTermDebt" name="EquityMethodInvestmentSummarizedFinancialInformationLongTermDebt" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="credit" />
  <xsd:element id="strt_EquityMethodInvestmentSummarizedFinancialInformationOtherNoncurrentLiabilities" name="EquityMethodInvestmentSummarizedFinancialInformationOtherNoncurrentLiabilities" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="credit" />
  <xsd:element id="strt_EquityMethodInvestmentSummarizedFinancialInformationTotalLiabilities" name="EquityMethodInvestmentSummarizedFinancialInformationTotalLiabilities" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="credit" />
  <xsd:element id="strt_EquityMethodInvestmentNetAssets" name="EquityMethodInvestmentNetAssets" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="debit" />
  <xsd:element id="strt_SummarizedBalanceSheetsAbstract" name="SummarizedBalanceSheetsAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="strt_RelatedPartyTransactionExpensesChargedToRelatedParty" name="RelatedPartyTransactionExpensesChargedToRelatedParty" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="credit" />
  <xsd:element id="strt_STRATTECCreditFacilityMember" name="STRATTECCreditFacilityMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="strt_ADACSTRATTECLLCCreditFacilityMember" name="ADACSTRATTECLLCCreditFacilityMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="strt_LesseeOperatingLeaseLiabilityPaymentsDueYearsFifthAndSixth" name="LesseeOperatingLeaseLiabilityPaymentsDueYearsFifthAndSixth" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="credit" />
  <xsd:element id="strt_PurchaseObligationDueInFifthAndSixthYear" name="PurchaseObligationDueInFifthAndSixthYear" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="credit" />
  <xsd:element id="strt_EffectiveIncomeTaxRateReconciliationFederalNetOperatingLossCarryBackStatutoryRateDifferential" name="EffectiveIncomeTaxRateReconciliationFederalNetOperatingLossCarryBackStatutoryRateDifferential" type="num:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="strt_EffectiveIncomeTaxRateReconciliationGlobalIntangibleLowTaxIncome" name="EffectiveIncomeTaxRateReconciliationGlobalIntangibleLowTaxIncome" type="num:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="strt_EffectiveIncomeTaxRateReconciliationTaxCreditExpenseResearch" name="EffectiveIncomeTaxRateReconciliationTaxCreditExpenseResearch" type="num:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="strt_EffectiveIncomeTaxRateReconciliationUncertainTaxPositions" name="EffectiveIncomeTaxRateReconciliationUncertainTaxPositions" type="num:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="strt_IncomeTaxLineItems" name="IncomeTaxLineItems" type="xbrli:stringItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="strt_IncomeTaxTable" name="IncomeTaxTable" type="xbrli:stringItemType" substitutionGroup="xbrldt:hypercubeItem" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="strt_OperatingLossCarryforwardsExpirationDateYear" name="OperatingLossCarryforwardsExpirationDateYear" type="xbrli:gYearItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="strt_DateTheBoardOfDirectorsFreezeBenefitAccrualsAndFutureEligibilityUnderTheQualifiedPensionPlan" name="DateTheBoardOfDirectorsFreezeBenefitAccrualsAndFutureEligibilityUnderTheQualifiedPensionPlan" type="xbrli:dateItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="strt_TerminationOfQualifiedPensionPlanDescription" name="TerminationOfQualifiedPensionPlanDescription" type="xbrli:stringItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="strt_Plan401KMember" name="Plan401KMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="strt_AnnualBenefitAccrualPercentageUnderSupplementalExecutiveRetirementPlan" name="AnnualBenefitAccrualPercentageUnderSupplementalExecutiveRetirementPlan" type="num:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="strt_DefinedBenefitPlanVestingPeriod" name="DefinedBenefitPlanVestingPeriod" type="xbrli:durationItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="strt_TrustAssets" name="TrustAssets" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="debit" />
  <xsd:element id="strt_OtherPostretirementBenefitsAnnualBenefitLimitPerFutureEligibleRetiree" name="OtherPostretirementBenefitsAnnualBenefitLimitPerFutureEligibleRetiree" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="credit" />
  <xsd:element id="strt_OtherPostretirementBenefitsMaximumBenefitPeriod" name="OtherPostretirementBenefitsMaximumBenefitPeriod" type="xbrli:durationItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="strt_PensionAndSupplementalEmployeeRetirementPlanDefinedBenefitMember" name="PensionAndSupplementalEmployeeRetirementPlanDefinedBenefitMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="strt_DefinedBenefitPlanRecoveriesSettlementsPlanAssets" name="DefinedBenefitPlanRecoveriesSettlementsPlanAssets" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit" />
  <xsd:element id="strt_PercentOfEachDollarOfEligibleEmployeeContributionsMatchedByEmployer" name="PercentOfEachDollarOfEligibleEmployeeContributionsMatchedByEmployer" type="num:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="strt_DefinedContributionPlanMatchingPercentOfCompensation" name="DefinedContributionPlanMatchingPercentOfCompensation" type="num:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="strt_TreasuryStockCumulativeSharesAcquiredUnderRepurchaseProgram" name="TreasuryStockCumulativeSharesAcquiredUnderRepurchaseProgram" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" />
  <xsd:element id="strt_TreasuryStockCostOfRepurchasesToDateCostMethod" name="TreasuryStockCostOfRepurchasesToDateCostMethod" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="debit" />
  <xsd:element id="strt_EmployeeStockPurchasePlanMember" name="EmployeeStockPurchasePlanMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="strt_EmployeeStockPurchasePlanNumberOfSharesAuthorized" name="EmployeeStockPurchasePlanNumberOfSharesAuthorized" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" />
  <xsd:element id="strt_StockIssuedDuringPeriodAverageSharePriceEmployeeStockPurchasePlans" name="StockIssuedDuringPeriodAverageSharePriceEmployeeStockPurchasePlans" type="num:perShareItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="strt_EmployeeStockPurchasePlanNumberOfSharesAvailableForGrant" name="EmployeeStockPurchasePlanNumberOfSharesAvailableForGrant" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" />
  <xsd:element id="strt_KeysAndLocksetsMember" name="KeysAndLocksetsMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="strt_DoorHandlesAndExteriorTrimMember" name="DoorHandlesAndExteriorTrimMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="strt_PowerAccessMember" name="PowerAccessMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="strt_LatchesMember" name="LatchesMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="strt_AftermarketAndOEServiceMember" name="AftermarketAndOEServiceMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="strt_DriverControlsMember" name="DriverControlsMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="strt_OtherProductMember" name="OtherProductMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="strt_ScheduleOfRevenueByMajorCustomersByReportingSegmentsAbstract" name="ScheduleOfRevenueByMajorCustomersByReportingSegmentsAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="strt_FiatChryslerAutomobilesMember" name="FiatChryslerAutomobilesMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="strt_GeneralMotorsCompanyMember" name="GeneralMotorsCompanyMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="strt_FordMotorCompanyMember" name="FordMotorCompanyMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="strt_TotalOfMajorCustomersMember" name="TotalOfMajorCustomersMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="strt_ScheduleOfReceivableByMajorCustomersByReportingSegmentsAbstract" name="ScheduleOfReceivableByMajorCustomersByReportingSegmentsAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
</xsd:schema>
