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Proc-Type: 2001,MIC-CLEAR
Originator-Name: webmaster@www.sec.gov
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<SEC-DOCUMENT>0001179110-11-003708.txt : 20110301
<SEC-HEADER>0001179110-11-003708.hdr.sgml : 20110301
<ACCEPTANCE-DATETIME>20110301135008
ACCESSION NUMBER:		0001179110-11-003708
CONFORMED SUBMISSION TYPE:	4
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20110224
FILED AS OF DATE:		20110301
DATE AS OF CHANGE:		20110301

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			Wathen David M
		CENTRAL INDEX KEY:			0001326561

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-10716
		FILM NUMBER:		11650499

	MAIL ADDRESS:	
		STREET 1:		5155 INKSTER ROAD
		CITY:			BLOOMFIELD HILLS
		STATE:			MI
		ZIP:			48302

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			TRIMAS CORP
		CENTRAL INDEX KEY:			0000842633
		STANDARD INDUSTRIAL CLASSIFICATION:	METAL FORGING & STAMPINGS [3460]
		IRS NUMBER:				382687639
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	BUSINESS ADDRESS:	
		STREET 1:		39400 WOODWARD AVENUE, SUITE 130
		CITY:			BLOOMFIELD HILLS
		STATE:			MI
		ZIP:			48304
		BUSINESS PHONE:		2486315400

	MAIL ADDRESS:	
		STREET 1:		39400 WOODWARD AVENUE, SUITE 130
		CITY:			BLOOMFIELD HILLS
		STATE:			MI
		ZIP:			48304
</SEC-HEADER>
<DOCUMENT>
<TYPE>4
<SEQUENCE>1
<FILENAME>edgar.xml
<DESCRIPTION>FORM 4 -
<TEXT>
<XML>
<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0303</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2011-02-24</periodOfReport>

    <notSubjectToSection16>0</notSubjectToSection16>

    <issuer>
        <issuerCik>0000842633</issuerCik>
        <issuerName>TRIMAS CORP</issuerName>
        <issuerTradingSymbol>TRS</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001326561</rptOwnerCik>
            <rptOwnerName>Wathen David M</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>39400 WOODWARD AVENUE</rptOwnerStreet1>
            <rptOwnerStreet2>SUITE 130</rptOwnerStreet2>
            <rptOwnerCity>BLOOMFIELD HILLS</rptOwnerCity>
            <rptOwnerState></rptOwnerState>
            <rptOwnerZipCode>48304</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>1</isDirector>
            <isOfficer>1</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
            <officerTitle>President and CEO</officerTitle>
            <otherText></otherText>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable></nonDerivativeTable>

    <derivativeTable>
        <derivativeTransaction>
            <securityTitle>
                <value>Restricted Stock Unit</value>
            </securityTitle>
            <conversionOrExercisePrice>
                <value>0</value>
                <footnoteId id="F1"/>
            </conversionOrExercisePrice>
            <transactionDate>
                <value>2011-02-24</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>A</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionAmounts>
                <transactionShares>
                    <value>42000</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>0</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <exerciseDate>
                <footnoteId id="F2"/>
                <footnoteId id="F3"/>
            </exerciseDate>
            <expirationDate>
                <value>2013-09-30</value>
                <footnoteId id="F4"/>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Common Stock</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>42000</value>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>42000</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                    <footnoteId id="F5"/>
                </directOrIndirectOwnership>
            </ownershipNature>
        </derivativeTransaction>
    </derivativeTable>

    <footnotes>
        <footnote id="F1">Each restricted stock unit represents a contingent right to receive the Fair Market Value of one share of common stock, payable only in shares of common stock.</footnote>
        <footnote id="F2">The Restricted Stock Units vest in increments as follows: (a) Upon the Company achieving at least $ 2.00 of cumulative earnings per share for any consecutive four financial quarters from 4/1/2011 through 9/30/2013 (the &quot;EPS Performance Measure&quot;), 10,500 Restricted Stock Units shall vest on the close of the business day immediately following the release of earnings for the quarter in which the EPS Performance Measure is met (&quot;EPS Vesting Date&quot;) and 5,250 Restricted Stock Units shall vest on the first anniversary of the EPS Vesting Date and  5,250 Restricted Stock Units shall vest on the second anniversary date of the EPS Vesting Date;</footnote>
        <footnote id="F3">(b) Upon the Company's stock price closing at or above $30.00 per share for 30 consecutive trading days provided such 30th trading day is prior to 9/30/2013, 5,250 Restricted Stock Units shall vest on the close of the business day when such trading threshold is satisfied, 2,625 Restricted Stock Units shall vest on the first anniversary of the satisfaction of such threshold and 2,625 Restricted Stock Units shall vest on the second anniversary of the satisfaction of such threshold; (c) Upon the Company's stock price closing at or above $35.00 per share for 30 consecutive trading days provided such 30th trading day is prior to 9/30/2013, 5,250 Restricted Stock Units shall vest on the close of the business day on which such trading threshold is satisfied, 2,625 Restricted Stock Units shall vest on the first anniversary of the satisfaction of such threshold and 2,625 Restricted Stock Units shall vest on the second anniversary of the satisfaction of such threshold.</footnote>
        <footnote id="F4">Subject to graduated vesting as described in footnote (2),(3) and Section II.A.(1) of the Restricted Stock Unit Agreement dated February 24, 2011.</footnote>
        <footnote id="F5">David M. Wathen and Laurene A. Wathen JT TEN WROS</footnote>
    </footnotes>

    <ownerSignature>
        <signatureName>/s/ Paula Reno attorney-in-fact</signatureName>
        <signatureDate>2011-03-01</signatureDate>
    </ownerSignature>
</ownershipDocument>
</XML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
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