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

    <schemaVersion>X0306</schemaVersion>

    <documentType>4/A</documentType>

    <periodOfReport>2016-03-18</periodOfReport>

    <dateOfOriginalSubmission>2016-03-21</dateOfOriginalSubmission>

    <notSubjectToSection16>0</notSubjectToSection16>

    <issuer>
        <issuerCik>0000090168</issuerCik>
        <issuerName>SIFCO INDUSTRIES INC</issuerName>
        <issuerTradingSymbol>SIF</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001200553</rptOwnerCik>
            <rptOwnerName>REITMAN ALAYNE L</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>SIFCO INDUSTRIES INC</rptOwnerStreet1>
            <rptOwnerStreet2>970 EAST 64TH STREET</rptOwnerStreet2>
            <rptOwnerCity>CLEVELAND</rptOwnerCity>
            <rptOwnerState>OH</rptOwnerState>
            <rptOwnerZipCode>44103</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>1</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>SIFCO Industries, Inc. common stock</value>
            </securityTitle>
            <transactionDate>
                <value>2016-03-18</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>A</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionTimeliness>
                <value></value>
            </transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>3881</value>
                </transactionShares>
                <transactionPricePerShare>
                    <footnoteId id="F1"/>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>3881</value>
                    <footnoteId id="F2"/>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
        <nonDerivativeHolding>
            <securityTitle>
                <value>SIFCO Industries, Inc. common stock</value>
            </securityTitle>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>12300</value>
                    <footnoteId id="F3"/>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeHolding>
        <nonDerivativeHolding>
            <securityTitle>
                <value>SIFCO Industries, Inc. common stock</value>
            </securityTitle>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>30</value>
                    <footnoteId id="F4"/>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>Son's custodial account</value>
                </natureOfOwnership>
            </ownershipNature>
        </nonDerivativeHolding>
    </nonDerivativeTable>

    <footnotes>
        <footnote id="F1">As originally filed on March 21, 2016, 3,881 restricted shares of SIFCO Industries, Inc. Common Stock was awarded.  Restriction to lapse on the day immediately preceding the on year anniversary date of this award.</footnote>
        <footnote id="F2">Transaction amended to reflect the total number of securities for this transaction to be 3,881 shares as opposed to 16,211 shares as originally filed on 3/21/2016.</footnote>
        <footnote id="F3">As part of the amended Form 4, Holding is added to reflect total number of SIFCO common stock to be 12,300 as opposed to including within the total transaction amount in line 1, column 5, as originally filed on 03/21/2016.</footnote>
        <footnote id="F4">As part of the amended Form 4, Holding is added to reflect total number of indirect ownership of SIFCO common stock to be 30 as opposed to including within the total transaction amount in line 1, column 5, as originally filed on 03/21/2016.</footnote>
    </footnotes>

    <ownerSignature>
        <signatureName>Elizabeth Button - by power of attorney</signatureName>
        <signatureDate>2016-06-06</signatureDate>
    </ownerSignature>
</ownershipDocument>
