<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0202</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2007-12-21</periodOfReport>

    <notSubjectToSection16>0</notSubjectToSection16>

    <issuer>
        <issuerCik>0001172243</issuerCik>
        <issuerName>MTC TECHNOLOGIES INC</issuerName>
        <issuerTradingSymbol>MTCT</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001422152</rptOwnerCik>
            <rptOwnerName>BAE Systems, Inc.</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>1601 RESEARCH BOULEVARD</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>ROCKVILLE</rptOwnerCity>
            <rptOwnerState>MD</rptOwnerState>
            <rptOwnerZipCode>20850-3173</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>1</isOther>
            <officerTitle></officerTitle>
            <otherText>See explanation in &quot;Remarks&quot;</otherText>
        </reportingOwnerRelationship>
    </reportingOwner>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001230244</rptOwnerCik>
            <rptOwnerName>BAE SYSTEMS PLC</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>6 CARLTON GARDENS</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>LONDON, ENGLAND</rptOwnerCity>
            <rptOwnerState>X0</rptOwnerState>
            <rptOwnerZipCode>SW1Y 5AD</rptOwnerZipCode>
            <rptOwnerStateDescription>UNITED KINGDOM</rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>1</isOther>
            <officerTitle></officerTitle>
            <otherText>See explanation in &quot;Remarks&quot;</otherText>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Common Stock, par value $.01 per share (&quot;Common Stock&quot;)</value>
            </securityTitle>
            <transactionDate>
                <value>2008-06-09</value>
            </transactionDate>
            <deemedExecutionDate></deemedExecutionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>J</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
                <footnoteId id="F1"/>
            </transactionCoding>
            <transactionTimeliness>
                <value></value>
            </transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>5612887</value>
                </transactionShares>
                <transactionPricePerShare>
                    <footnoteId id="F1"/>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>D</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>1000</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>See</value>
                    <footnoteId id="F1"/>
                </natureOfOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
    </nonDerivativeTable>

    <derivativeTable></derivativeTable>

    <footnotes>
        <footnote id="F1">See &quot;Remarks&quot;.</footnote>
    </footnotes>

    <remarks>Beneficial ownership of shares of Common Stock referred to herein was reported in the Initial Statement of Beneficial Ownership of Securities on Form 3 (the &quot;Form 3&quot;) filed with the Securities Exchange Commission on December 31, 2007 because (i) BAE Systems, Inc. (&quot;BAE Systems&quot;) may have been deemed to have had beneficial ownership of such shares as a result of the Voting Agreement dated as of December 21, 2007, among BAE Systems, Inc., Rajesh K. Soin and Rivas Enterprises Limited Partnership III (the &quot;Voting Agreement&quot;) and (ii) BAE Systems plc, as the owner of 100% of the capital stock of BAE Systems, may have been deemed to have been the beneficial owner of any shares BAE Systems was deemed to beneficially own.  On June 9, 2008, the merger of Mira Acquisition Sub Inc., a wholly-owned, indirect subsidiary of BAE Systems, Inc. (&quot;Merger Sub&quot;), with and into the Issuer was completed, the Voting Agreement terminated by its terms and the Issuer became a wholly-owned, indirect subsidiary of BAE Systems, pursuant to the terms of the Agreement and Plan of Merger dated as of December 21, 2007, among BAE Systems, Merger Sub and the Issuer.  Pursuant to Rule 16a-1(a)(4) under the Securities Exchange Act of 1934, as amended (the &quot;Exchange Act&quot;), BAE Systems and BAE Systems plc state that neither this Statement of Changes in Beneficial Ownership of Securities on Form 4 nor the initial Form 3 shall be deemed an admission that either BAE Systems or BAE Systems plc was, for purposes of Section 16 of the Exchange Act or otherwise, the beneficial owner of such shares of Common Stock, and such beneficial ownership is expressly disclaimed.</remarks>

    <ownerSignature>
        <signatureName>/s/ Sheila C. Cheston, Senior Vice President and General Counsel</signatureName>
        <signatureDate>2008-06-09</signatureDate>
    </ownerSignature>
</ownershipDocument>
