-----BEGIN PRIVACY-ENHANCED MESSAGE-----
Proc-Type: 2001,MIC-CLEAR
Originator-Name: webmaster@www.sec.gov
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MIC-Info: RSA-MD5,RSA,
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<SEC-DOCUMENT>0001251504-03-000001.txt : 20030702
<SEC-HEADER>0001251504-03-000001.hdr.sgml : 20030702
<ACCEPTANCE-DATETIME>20030702123907
ACCESSION NUMBER:		0001251504-03-000001
CONFORMED SUBMISSION TYPE:	4
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20030701
FILED AS OF DATE:		20030702

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			PRO DEX INC
		CENTRAL INDEX KEY:			0000788920
		STANDARD INDUSTRIAL CLASSIFICATION:	WHOLESALE-MEDICAL, DENTAL & HOSPITAL EQUIPMENT & SUPPLIES [5047]
		IRS NUMBER:				841261240
		STATE OF INCORPORATION:			CO
		FISCAL YEAR END:			0630

	BUSINESS ADDRESS:	
		STREET 1:		650 S. TAYKOR AVENUE
		STREET 2:		SUITE 20-A
		CITY:			LOUISVILLE
		STATE:			CO
		ZIP:			80027
		BUSINESS PHONE:		3034438165

	MAIL ADDRESS:	
		STREET 1:		1401 WALNUT STREET
		STREET 2:		SUITE 540
		CITY:			BOULDER
		STATE:			CO
		ZIP:			80302

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			COSS RONALD G
		CENTRAL INDEX KEY:			0001251504

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	000-14942
		FILM NUMBER:		03770605

	BUSINESS ADDRESS:	
		STREET 1:		3 OVERLOOK DR.
		CITY:			NEWPORT COAST
		STATE:			CA
		ZIP:			92657
		BUSINESS PHONE:		9493767590

	MAIL ADDRESS:	
		STREET 1:		3 OVERLOOK DR
		CITY:			NEWPORT COAST
		STATE:			CA
		ZIP:			92657
</SEC-HEADER>
<DOCUMENT>
<TYPE>4
<SEQUENCE>1
<FILENAME>primary_doc.xml
<DESCRIPTION>PRIMARY DOCUMENT
<TEXT>
<XML>
<?xml version="1.0"?>

<ownershipDocument>

    <documentType>4</documentType>

    <periodOfReport>2003-07-01</periodOfReport>


    <notSubjectToSection16>0</notSubjectToSection16>

    <issuer>
        <issuerCik>0000788920</issuerCik>
        <issuerName>PRO DEX INC</issuerName>
        <issuerTradingSymbol>pdex</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001251504</rptOwnerCik>
            <rptOwnerName>COSS RONALD G</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>  </rptOwnerStreet1>
            <rptOwnerStreet2>  </rptOwnerStreet2>
            <rptOwnerCity>  </rptOwnerCity>
            <rptOwnerState>  </rptOwnerState>
            <rptOwnerZipCode>  </rptOwnerZipCode>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>1</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <derivativeSecurity>
        <securityTitle>
            <value>Stock Options</value>
        </securityTitle>
        <conversionOrExercisePrice>
            <value>1.4</value>
        </conversionOrExercisePrice>
        <transactionDate>
            <value>2003-07-01</value>
        </transactionDate>
        <transactionCoding>
            <transactionFormType>4</transactionFormType>
            <transactionCode>A</transactionCode>
            <equitySwapInvolved>0</equitySwapInvolved>
        </transactionCoding>
        <transactionTimeliness>
            <value></value>
        </transactionTimeliness>
        <transactionAmounts>
            <transactionShares>
                <value>15000</value>
            </transactionShares>
            <transactionValue>
                <value>1.4</value>
            </transactionValue>
            <transactionAcquiredDisposedCode>
                <value>A</value>
            </transactionAcquiredDisposedCode>
        </transactionAmounts>
        <exerciseDate>
            <value>2004-01-01</value>
        </exerciseDate>
        <expirationDate>
            <value>2013-06-30</value>
        </expirationDate>
        <underlyingSecurity>
            <underlyingSecurityTitle>
                <value>Pro-Dex Common stock</value>
            </underlyingSecurityTitle>
            <underlyingSecurityShares>
                <value>15000</value>
            </underlyingSecurityShares>
        </underlyingSecurity>
        <postTransactionAmounts>
            <sharesOwnedFollowingTransaction>
                <value>2286804</value>
                <footnoteId id="F1"/>
                <footnoteId id="F2"/>
            </sharesOwnedFollowingTransaction>
        </postTransactionAmounts>
        <ownershipNature>
            <directOrIndirectOwnership>
                <value>I</value>
            </directOrIndirectOwnership>
            <natureOfOwnership>
                <value>Trust</value>
            </natureOfOwnership>
        </ownershipNature>
    </derivativeSecurity>

    <footnotes>
        <footnote id="F1">Declaration of Trust dated 10/3/1985</footnote>
        <footnote id="F2">Includes 548,953 shares of the issuer's common stock which were distributed from the ESOP of Micro Motors, a subsidiary of the issuer.  On 3/31/99, such shares of common stock were rolled over into an IRA and as of such date are held directly by the reporting person.</footnote>
    </footnotes>

    <ownerSignature>
        <signatureName>Ronald G. Coss</signatureName>
        <signatureDate>2003-07-02</signatureDate>
    </ownerSignature>

</ownershipDocument>

</XML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
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