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

    <schemaVersion>X0202</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2005-07-21</periodOfReport>

    <notSubjectToSection16>0</notSubjectToSection16>

    <issuer>
        <issuerCik>0000008858</issuerCik>
        <issuerName>AVNET INC</issuerName>
        <issuerTradingSymbol>AVT</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001333167</rptOwnerCik>
            <rptOwnerName>Permira (Europe) Ltd.</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>TRAFALGAR COURT, LES BANQUES</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>ST. PETER PORT, GUERNSEY CH IS</rptOwnerCity>
            <rptOwnerState>XX</rptOwnerState>
            <rptOwnerZipCode>GY13QL</rptOwnerZipCode>
            <rptOwnerStateDescription>Unknown</rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001333166</rptOwnerCik>
            <rptOwnerName>Permira UK Venture IV Nominees Ltd</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>TRAFALGAR COURT, LES BANQUES</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>ST. PETER PORT, GUERNSEY CH IS</rptOwnerCity>
            <rptOwnerState>XX</rptOwnerState>
            <rptOwnerZipCode>GY13QL</rptOwnerZipCode>
            <rptOwnerStateDescription>Unknown</rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001333165</rptOwnerCik>
            <rptOwnerName>Permira Europe II Managers L.P.</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>TRAFALGAR COURT, LES BANQUES</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>ST. PETER PORT, GUERNSEY CH IS</rptOwnerCity>
            <rptOwnerState>XX</rptOwnerState>
            <rptOwnerZipCode>GY13QL</rptOwnerZipCode>
            <rptOwnerStateDescription>Unknown</rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001333164</rptOwnerCik>
            <rptOwnerName>Permira Europe II Nominees Ltd</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>TRAFALGAR COURT, LES BANQUES</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>ST. PETER PORT, GUERNSEY CH IS</rptOwnerCity>
            <rptOwnerState>XX</rptOwnerState>
            <rptOwnerZipCode>GY13QL</rptOwnerZipCode>
            <rptOwnerStateDescription>Unknown</rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001333163</rptOwnerCik>
            <rptOwnerName>SV (Nominees) LTD</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>TRAFALGAR COURT, LES BANQUES</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>ST. PETER PORT, GUERNSEY CH IS</rptOwnerCity>
            <rptOwnerState>XX</rptOwnerState>
            <rptOwnerZipCode>GY13QL</rptOwnerZipCode>
            <rptOwnerStateDescription>Unknown</rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001333162</rptOwnerCik>
            <rptOwnerName>Schroder Ventures Investment LTD</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>TRAFALGAR COURT, LES BANQUES</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>ST. PETER PORT, GUERNSEY CH IS</rptOwnerCity>
            <rptOwnerState>XX</rptOwnerState>
            <rptOwnerZipCode>GY13QL</rptOwnerZipCode>
            <rptOwnerStateDescription>Unknown</rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001333161</rptOwnerCik>
            <rptOwnerName>Schroder Venture Managers (Guernsey) LTD</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>TRAFALGAR COURT, LES BANQUES</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>ST. PETER PORT, GUERNSEY CH IS</rptOwnerCity>
            <rptOwnerState>XX</rptOwnerState>
            <rptOwnerZipCode>GY13QL</rptOwnerZipCode>
            <rptOwnerStateDescription>Unknown</rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <transactionDate>
                <value>2005-07-21</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>J</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
                <footnoteId id="F1"/>
            </transactionCoding>
            <transactionTimeliness>
                <value></value>
            </transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>2957690</value>
                    <footnoteId id="F2"/>
                </transactionShares>
                <transactionPricePerShare>
                    <footnoteId id="F1"/>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>16153797</value>
                    <footnoteId id="F2"/>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                    <footnoteId id="F4"/>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>-</value>
                    <footnoteId id="F4"/>
                </natureOfOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <transactionDate>
                <value>2005-07-21</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>J</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
                <footnoteId id="F1"/>
            </transactionCoding>
            <transactionTimeliness>
                <value></value>
            </transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>214835</value>
                    <footnoteId id="F3"/>
                </transactionShares>
                <transactionPricePerShare>
                    <footnoteId id="F1"/>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>1173350</value>
                    <footnoteId id="F3"/>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                    <footnoteId id="F5"/>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>-</value>
                    <footnoteId id="F5"/>
                </natureOfOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <transactionDate>
                <value>2005-07-21</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>J</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
                <footnoteId id="F1"/>
            </transactionCoding>
            <transactionTimeliness>
                <value></value>
            </transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>115390</value>
                </transactionShares>
                <transactionPricePerShare>
                    <footnoteId id="F1"/>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>630220</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                    <footnoteId id="F6"/>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>-</value>
                    <footnoteId id="F6"/>
                </natureOfOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
    </nonDerivativeTable>

    <footnotes>
        <footnote id="F1">Acquired pursuant to the Securities Acquisition Agreement, dated as of April 26, 2005 among Avnet, Inc., the Sellers named therein and Memec Group Holdings Limited.</footnote>
        <footnote id="F2">These shares are owned directly by Permira Europe II Nominees Limited, a company incorporated in Guernsey (&quot;PE2&quot;).  The shares acquired by PE2 in the reported transaction include (i) 2,929,149 shares acquired on behalf of four limited partnerships that comprise the Permira Europe Fund II, and (ii) 28,542 shares acquired on behalf of the Permira Europe II Co-Investment Scheme.  The shares beneficially owned by PE2 following the reported transaction include (i) 15,997,914 shares held on behalf of four limited partnerships that comprise the Permira Europe Fund II, and (ii) 155,883 shares held on behalf of the Permira Europe II Co-Investment Scheme.</footnote>
        <footnote id="F3">These shares are owned directly by Permira UK Venture IV Nominees Limited, a company incorporated in Guernsey (&quot;VF4&quot;).  The shares acquired by VF4 in the reported transaction include (i) 213,026 shares acquired on behalf of one trust and two limited partnerships that comprise the Permira UK Venture Fund IV, and (ii) 1,809 shares acquired on behalf of the Schroder UK Venture Fund IV Co-Investment Scheme.  The shares held of record by VF4 following the reported transaction include (i) 1,163,468 shares held on behalf of one trust and two limited partnerships that comprise the Permira UK Venture Fund IV, and (ii) 9,882 shares held on behalf of the Schroder UK Venture Fund IV Co- Investment Scheme.</footnote>
        <footnote id="F4">Permira (Europe) Limited is the general partner of Permira Europe II Managers L.P., which is the general partner for each of the partnerships comprising the Permira Europe Fund II.  Both Permira (Europe) Limited and Permira Europe II Managers L.P. are indirect beneficial owners of the reported securities and disclaim beneficial ownership of these securities except to the extent of their pecuniary interest therein.</footnote>
        <footnote id="F5">Schroder Venture Managers (Guernsey) Limited acts as the manager of Schroder Venture Managers Inc., the general partner of the two limited partnerships, and Barings (Guernsey) Limited, the trustee of the trust, which comprise the Permira UK Venture IV.  Schroder Venture Managers (Guernsey) Limtied is an indirect beneficial owner of the reported securities and disclaims beneficial ownership of these securities except to the extent of its pecuniary interest therein.</footnote>
        <footnote id="F6">These shares are owned directly by SV (Nominees) Limtied (&quot;SV&quot;) a company incorporated in Guernsey.  SV is the nominee for Schroder Ventures Investment Limited, who is an indirect beneficial owner of the reported securities and disclaims beneficial ownership of these securities except to the extent of its pecuniary interest therein.</footnote>
    </footnotes>

    <remarks>PE2, VF4 and SV are members of a group for purposes of Section 13(d) of the Exchange Act.</remarks>

    <ownerSignature>
        <signatureName>/s/ Laurence McNairn</signatureName>
        <signatureDate>2005-07-22</signatureDate>
    </ownerSignature>
</ownershipDocument>
