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Proc-Type: 2001,MIC-CLEAR
Originator-Name: webmaster@www.sec.gov
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 TWSM7vrzLADbmYQaionwg5sDW3P6oaM5D3tdezXMm7z1T+B+twIDAQAB
MIC-Info: RSA-MD5,RSA,
 UGukj9pqXWt6e1PpACpSPqIYVIzxPAfdo1U+GhDU1MVshEiNSeGNw9CW3n57mOlp
 31pXgcvR9nmJajbKcx6J7Q==

<SEC-DOCUMENT>0001229917-08-000101.txt : 20080828
<SEC-HEADER>0001229917-08-000101.hdr.sgml : 20080828
<ACCEPTANCE-DATETIME>20080828125726
ACCESSION NUMBER:		0001229917-08-000101
CONFORMED SUBMISSION TYPE:	4
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20080827
FILED AS OF DATE:		20080828
DATE AS OF CHANGE:		20080828

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			KENNAMETAL INC
		CENTRAL INDEX KEY:			0000055242
		STANDARD INDUSTRIAL CLASSIFICATION:	MACHINE TOOLS, METAL CUTTING TYPES [3541]
		IRS NUMBER:				250900168
		STATE OF INCORPORATION:			PA
		FISCAL YEAR END:			0630

	BUSINESS ADDRESS:	
		STREET 1:		1600 TECHNOLOGY WAY
		STREET 2:		P O  BOX 231
		CITY:			LATROBE
		STATE:			PA
		ZIP:			15650
		BUSINESS PHONE:		7245395000

	MAIL ADDRESS:	
		STREET 1:		1600 TECHNOLOGY WAY
		STREET 2:		PO BOX 231
		CITY:			LATROBE
		STATE:			PA
		ZIP:			15650

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			YOST LARRY D
		CENTRAL INDEX KEY:			0001189236

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-05318
		FILM NUMBER:		081044610

	BUSINESS ADDRESS:	
		STREET 1:		C/O ARVINMERITOR INC
		STREET 2:		2135 W. MAPLE RD
		CITY:			TROY
		STATE:			MI
		ZIP:			48084
		BUSINESS PHONE:		262-373-7400

	MAIL ADDRESS:	
		STREET 1:		13000 WEST SILVER SPRING DRIVE
		CITY:			BUTLER
		STATE:			WI
		ZIP:			53201
</SEC-HEADER>
<DOCUMENT>
<TYPE>4
<SEQUENCE>1
<FILENAME>edgardoc.xml
<DESCRIPTION>PRIMARY DOCUMENT
<TEXT>
<XML>
<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0303</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2008-08-27</periodOfReport>

    <notSubjectToSection16>0</notSubjectToSection16>

    <issuer>
        <issuerCik>0000055242</issuerCik>
        <issuerName>KENNAMETAL INC</issuerName>
        <issuerTradingSymbol>KMT</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001189236</rptOwnerCik>
            <rptOwnerName>YOST LARRY D</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>1600 TECHNOLOGY WAY</rptOwnerStreet1>
            <rptOwnerStreet2>P.O. BOX 231</rptOwnerStreet2>
            <rptOwnerCity>LATROBE</rptOwnerCity>
            <rptOwnerState>PA</rptOwnerState>
            <rptOwnerZipCode>15650</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>1</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <transactionDate>
                <value>2008-08-27</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>M</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionAmounts>
                <transactionShares>
                    <value>6000</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>10.31</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>6494</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <transactionDate>
                <value>2008-08-27</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>S</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionAmounts>
                <transactionShares>
                    <value>6000</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>34.91</value>
                    <footnoteId id="F1"/>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>D</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>494</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
    </nonDerivativeTable>

    <derivativeTable>
        <derivativeTransaction>
            <securityTitle>
                <value>Non-Qualified Stock Option (right to buy)</value>
            </securityTitle>
            <conversionOrExercisePrice>
                <value>10.31</value>
            </conversionOrExercisePrice>
            <transactionDate>
                <value>2008-08-27</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>M</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionAmounts>
                <transactionShares>
                    <value>6000</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>0</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>D</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <exerciseDate>
                <value>2001-10-29</value>
            </exerciseDate>
            <expirationDate>
                <value>2008-10-30</value>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Common Stock</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>6000</value>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>0</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </derivativeTransaction>
    </derivativeTable>

    <footnotes>
        <footnote id="F1">This price is a weighted average price.  The range of prices for the transactions is $34.82 to $35.03.  Full information regarding the number of shares sold at each separate price will be provided upon request.</footnote>
    </footnotes>

    <ownerSignature>
        <signatureName>By: David W. Greenfield  For: Larry D. Yost</signatureName>
        <signatureDate>2008-08-28</signatureDate>
    </ownerSignature>
</ownershipDocument>
</XML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
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