<?xml version="1.0"?>

<ownershipDocument>

    <documentType>4</documentType>

    <periodOfReport>2003-07-14</periodOfReport>


    <notSubjectToSection16>1</notSubjectToSection16>

    <issuer>
        <issuerCik>0000041052</issuerCik>
        <issuerName>BONTEX INC</issuerName>
        <issuerTradingSymbol>BOTX.PK</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001243740</rptOwnerCik>
            <rptOwnerName>TISCHIO PATRICIA S</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>  </rptOwnerStreet1>
            <rptOwnerStreet2>  </rptOwnerStreet2>
            <rptOwnerCity>  </rptOwnerCity>
            <rptOwnerState>  </rptOwnerState>
            <rptOwnerZipCode>  </rptOwnerZipCode>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeSecurity>
        <securityTitle>
            <value>Common Stock</value>
        </securityTitle>
        <transactionDate>
            <value>2003-07-14</value>
        </transactionDate>
        <transactionCoding>
            <transactionFormType>5</transactionFormType>
            <transactionCode>W</transactionCode>
            <equitySwapInvolved>0</equitySwapInvolved>
            <footnoteId id="F1"/>
        </transactionCoding>
        <transactionTimeliness>
            <value>E</value>
        </transactionTimeliness>
        <transactionAmounts>
            <transactionShares>
                <value>421541</value>
            </transactionShares>
            <transactionValue>
                <value>0</value>
            </transactionValue>
            <transactionAcquiredDisposedCode>
                <value>A</value>
            </transactionAcquiredDisposedCode>
        </transactionAmounts>
        <postTransactionAmounts>
            <sharesOwnedFollowingTransaction>
                <value>421641</value>
            </sharesOwnedFollowingTransaction>
        </postTransactionAmounts>
        <ownershipNature>
            <directOrIndirectOwnership>
                <value>D</value>
            </directOrIndirectOwnership>
        </ownershipNature>
    </nonDerivativeSecurity>

    <nonDerivativeSecurity>
        <securityTitle>
            <value>Common Stock</value>
        </securityTitle>
        <transactionDate>
            <value>2003-07-14</value>
        </transactionDate>
        <transactionCoding>
            <transactionFormType>4</transactionFormType>
            <transactionCode>S</transactionCode>
            <equitySwapInvolved>0</equitySwapInvolved>
        </transactionCoding>
        <transactionTimeliness>
            <value></value>
        </transactionTimeliness>
        <transactionAmounts>
            <transactionShares>
                <value>421541</value>
            </transactionShares>
            <transactionValue>
                <value>0.795</value>
                <footnoteId id="F2"/>
            </transactionValue>
            <transactionAcquiredDisposedCode>
                <value>D</value>
            </transactionAcquiredDisposedCode>
        </transactionAmounts>
        <postTransactionAmounts>
            <sharesOwnedFollowingTransaction>
                <value>100</value>
                <footnoteId id="F3"/>
            </sharesOwnedFollowingTransaction>
        </postTransactionAmounts>
        <ownershipNature>
            <directOrIndirectOwnership>
                <value>D</value>
            </directOrIndirectOwnership>
        </ownershipNature>
    </nonDerivativeSecurity>

    <footnotes>
        <footnote id="F1">Effective on July 14, 2003, and pursuant to an order entered by the Superior Court of New Jersey, Chancery Division Probate Part, for Monmouth County, the reporting person received a distribution (or is deemed to have received a distribution) of 47,700 shares of Bontex common stock from the Hugo N. Surmonte Residuary Trust, 36,088 shares of Bontex common stock from the Hugo N. Surmonte Marital Trust, and 337,753 shares of Bontex common stock from the Estate of Marie G. Surmonte.  Simultaneously with such distributions (or deemed distributions), the reporting person sold such shares to Dolores S. Kostelni.</footnote>
        <footnote id="F2">As consideration for the shares sold by the reporting person, Ms. Kostelni has agreed to pay all of the federal and state and inheritance taxes (plus interest and penalties and including the fees and expenses of the executors and other related expenses) (the &quot;Estate Tax Obligations&quot;) due and owing with respect to the Estate of Marie G. Surmonte.  As of the effective date of the transaction, the Estate Tax Obligations were approximately $670,000, of which approximately $335,000 (or $0.795 per share) is allocable to the shares sold by the reporting person. Because the exact amount of the Estate Tax Obligations cannot be determined until such obligations are paid in full, the exact purchase price cannot be determined as of the filing of this report.</footnote>
        <footnote id="F3">The reporting also indirectly holds 2,750 shares of Bontex common stock through her adult daughter.  The reporting person disclaims beneficial ownership of these securities, and this report shall not be deemed an admission that the reporting person is the beneficial owner of the securities for purposes of Section 16 or for any other purpose.</footnote>
    </footnotes>

    <ownerSignature>
        <signatureName>Patricia S. Tischio</signatureName>
        <signatureDate>2003-07-15</signatureDate>
    </ownerSignature>

</ownershipDocument>

