-----BEGIN PRIVACY-ENHANCED MESSAGE-----
Proc-Type: 2001,MIC-CLEAR
Originator-Name: webmaster@www.sec.gov
Originator-Key-Asymmetric:
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 TWSM7vrzLADbmYQaionwg5sDW3P6oaM5D3tdezXMm7z1T+B+twIDAQAB
MIC-Info: RSA-MD5,RSA,
 E9A76q1p1pz+VqvuepokcNi8gOEzhWrvjY0tfNAwJjROenN+afsCElv76R45uOH9
 8PnpU8GH4UvSPvgJMgvuwg==

<SEC-DOCUMENT>0001253354-10-000001.txt : 20100223
<SEC-HEADER>0001253354-10-000001.hdr.sgml : 20100223
<ACCEPTANCE-DATETIME>20100223153901
ACCESSION NUMBER:		0001253354-10-000001
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:			SPARTON CORP
		CENTRAL INDEX KEY:			0000092679
		STANDARD INDUSTRIAL CLASSIFICATION:	PRINTED CIRCUIT BOARDS [3672]
		IRS NUMBER:				381054690
		STATE OF INCORPORATION:			OH
		FISCAL YEAR END:			0630

	BUSINESS ADDRESS:	
		STREET 1:		2400 E GANSON ST
		CITY:			JACKSON
		STATE:			MI
		ZIP:			49202
		BUSINESS PHONE:		5177878600

	MAIL ADDRESS:	
		STREET 1:		2400 E GANSONS STREET
		CITY:			JACKSON
		STATE:			MI
		ZIP:			49202

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	SPARKS WITHINGTON CO
		DATE OF NAME CHANGE:	19710510

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			MOLFENTER DAVID P
		CENTRAL INDEX KEY:			0001253354

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-01000
		FILM NUMBER:		10625816

	MAIL ADDRESS:	
		STREET 1:		425 NORTH MARTINGALE ROAD
		STREET 2:		SUITE 2050
		CITY:			SCHAUMBURG
		STATE:			IL
		ZIP:			60173
</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>0000092679</issuerCik>
        <issuerName>SPARTON CORP</issuerName>
        <issuerTradingSymbol>SPA</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001253354</rptOwnerCik>
            <rptOwnerName>MOLFENTER DAVID P</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>425 NORTH MARTINGALE ROAD</rptOwnerStreet1>
            <rptOwnerStreet2>SUITE 2050</rptOwnerStreet2>
            <rptOwnerCity>SCHAUMBURG</rptOwnerCity>
            <rptOwnerState>IL</rptOwnerState>
            <rptOwnerZipCode>60173</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>2010-02-22</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>P</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionTimeliness>
                <value></value>
            </transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>1000</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>6.1</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>14746</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
    </nonDerivativeTable>

    <ownerSignature>
        <signatureName>Carrie Leahy, Attorney-in-Fact by Power of Attorney</signatureName>
        <signatureDate>2010-02-23</signatureDate>
    </ownerSignature>
</ownershipDocument>
</XML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
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