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Proc-Type: 2001,MIC-CLEAR
Originator-Name: webmaster@www.sec.gov
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MIC-Info: RSA-MD5,RSA,
 RMPqN+KrjXWc/o4ZIZ2KDceacfPsa/pE+OOjg1zqhGqEbHP6DpUizbLPuaKLvpQd
 hPcEKPBOIZM5u1o56MZ8eA==

<SEC-DOCUMENT>0001257503-10-000012.txt : 20100223
<SEC-HEADER>0001257503-10-000012.hdr.sgml : 20100223
<ACCEPTANCE-DATETIME>20100223141658
ACCESSION NUMBER:		0001257503-10-000012
CONFORMED SUBMISSION TYPE:	4
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20100222
FILED AS OF DATE:		20100223
DATE AS OF CHANGE:		20100223

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			PREFORMED LINE PRODUCTS CO
		CENTRAL INDEX KEY:			0000080035
		STANDARD INDUSTRIAL CLASSIFICATION:	WATER, SEWER, PIPELINE, COMM AND POWER LINE CONSTRUCTION [1623]
		IRS NUMBER:				340676895
		STATE OF INCORPORATION:			OH
		FISCAL YEAR END:			1231

	BUSINESS ADDRESS:	
		STREET 1:		P.O. BOX 91129
		CITY:			CLEVELAND
		STATE:			OH
		ZIP:			44101

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			CURLEE J CECIL JR
		CENTRAL INDEX KEY:			0001257494

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	000-31164
		FILM NUMBER:		10625297

	MAIL ADDRESS:	
		STREET 1:		C/O PREFORMED LINE PRODUCTS
		STREET 2:		PO BOX 91129
		CITY:			CLEVELAND
		STATE:			OH
		ZIP:			44101
</SEC-HEADER>
<DOCUMENT>
<TYPE>4
<SEQUENCE>1
<FILENAME>primary_doc.xml
<DESCRIPTION>PRIMARY DOCUMENT
<TEXT>
<XML>
<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0303</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2010-02-22</periodOfReport>

    <notSubjectToSection16>0</notSubjectToSection16>

    <issuer>
        <issuerCik>0000080035</issuerCik>
        <issuerName>PREFORMED LINE PRODUCTS CO</issuerName>
        <issuerTradingSymbol>PLPC</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001257494</rptOwnerCik>
            <rptOwnerName>CURLEE J CECIL JR</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>C/O PREFORMED LINE PRODUCTS</rptOwnerStreet1>
            <rptOwnerStreet2>PO BOX 91129</rptOwnerStreet2>
            <rptOwnerCity>CLEVELAND</rptOwnerCity>
            <rptOwnerState>OH</rptOwnerState>
            <rptOwnerZipCode>44101</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>1</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
            <officerTitle>V.P. - Human Resources</officerTitle>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Common shares, $2 par value</value>
            </securityTitle>
            <transactionDate>
                <value>2010-02-22</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>A</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionTimeliness>
                <value></value>
            </transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>5129</value>
                    <footnoteId id="F1"/>
                </transactionShares>
                <transactionPricePerShare>
                    <value>0</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>15312</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
    </nonDerivativeTable>

    <derivativeTable>
        <derivativeHolding>
            <securityTitle>
                <value>Employee stock option (right to buy)</value>
            </securityTitle>
            <conversionOrExercisePrice>
                <value>14.33</value>
            </conversionOrExercisePrice>
            <exerciseDate>
                <value>2004-04-28</value>
            </exerciseDate>
            <expirationDate>
                <value>2013-04-27</value>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Common shares, $2 par value</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>8057</value>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>8057</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </derivativeHolding>
    </derivativeTable>

    <footnotes>
        <footnote id="F1">Restricted Common shares granted to the Reporting Person pursuant to the Company's Longe Term Incentive Plan of 2008.  Provided that the Reporting Person has not voluntarily terminated his employment, 1,026 shares vest and will no longer be subject to risk of forfeiture on 12/31/2012, and depending on continued employment and on Company performance, 4,103 shares vest and will no longer be subject to risk of forfeiture on 12/31/2012.</footnote>
    </footnotes>

    <ownerSignature>
        <signatureName>/s/Eric R. Graef, by power of attorney</signatureName>
        <signatureDate>2010-02-23</signatureDate>
    </ownerSignature>
</ownershipDocument>
</XML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
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