<SEC-DOCUMENT>0001302020-11-000001.txt : 20110817
<SEC-HEADER>0001302020-11-000001.hdr.sgml : 20110817
<ACCEPTANCE-DATETIME>20110817115915
ACCESSION NUMBER:		0001302020-11-000001
CONFORMED SUBMISSION TYPE:	4
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20110815
FILED AS OF DATE:		20110817
DATE AS OF CHANGE:		20110817

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			Strasburg Philip A
		CENTRAL INDEX KEY:			0001302020

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	000-16035
		FILM NUMBER:		111041813

	MAIL ADDRESS:	
		STREET 1:		41 WILDWOOD ROAD
		CITY:			SCARSDALE
		STATE:			NY
		ZIP:			10583

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			SONO TEK CORP
		CENTRAL INDEX KEY:			0000806172
		STANDARD INDUSTRIAL CLASSIFICATION:	MISCELLANEOUS ELECTRICAL MACHINERY, EQUIPMENT & SUPPLIES [3690]
		IRS NUMBER:				141568099
		STATE OF INCORPORATION:			NY
		FISCAL YEAR END:			0228

	BUSINESS ADDRESS:	
		STREET 1:		2012 RT 9W BLDG 3
		CITY:			MILTON
		STATE:			NY
		ZIP:			12547
		BUSINESS PHONE:		8457952020

	MAIL ADDRESS:	
		STREET 1:		2012 RT. 9W, BLDG. 3,
		CITY:			MILTON
		STATE:			NY
		ZIP:			12547
</SEC-HEADER>
<DOCUMENT>
<TYPE>4
<SEQUENCE>1
<FILENAME>primary_doc.xml
<DESCRIPTION>PRIMARY DOCUMENT
<TEXT>
<XML>
<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0304</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2011-08-15</periodOfReport>

    <notSubjectToSection16>0</notSubjectToSection16>

    <issuer>
        <issuerCik>0000806172</issuerCik>
        <issuerName>SONO TEK CORP</issuerName>
        <issuerTradingSymbol>sotk</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001302020</rptOwnerCik>
            <rptOwnerName>Strasburg Philip A</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>19380 CEDAR GLEN DR</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>BOCA RATON</rptOwnerCity>
            <rptOwnerState>FL</rptOwnerState>
            <rptOwnerZipCode>33434</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>1</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>SonoTek Common Stock</value>
            </securityTitle>
            <transactionDate>
                <value>2011-08-15</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>P</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionTimeliness>
                <value></value>
            </transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>5000</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>1.2</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>40000</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>Owned by Spouse of reporting person</value>
                </natureOfOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
    </nonDerivativeTable>

    <ownerSignature>
        <signatureName>Philip Strasburg</signatureName>
        <signatureDate>2011-08-17</signatureDate>
    </ownerSignature>
</ownershipDocument>
</XML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
