<SEC-DOCUMENT>0000891839-20-000188.txt : 20200615
<SEC-HEADER>0000891839-20-000188.hdr.sgml : 20200615
<ACCEPTANCE-DATETIME>20200615162942
ACCESSION NUMBER:		0000891839-20-000188
CONFORMED SUBMISSION TYPE:	4
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20200612
FILED AS OF DATE:		20200615
DATE AS OF CHANGE:		20200615

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			Schnorr Lisa M.
		CENTRAL INDEX KEY:			0001615574

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-08462
		FILM NUMBER:		20963749

	MAIL ADDRESS:	
		STREET 1:		C/O GRAHAM CORPORATION
		STREET 2:		20 FLORENCE AVENUE
		CITY:			BATAVIA
		STATE:			NY
		ZIP:			14020

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			GRAHAM CORP
		CENTRAL INDEX KEY:			0000716314
		STANDARD INDUSTRIAL CLASSIFICATION:	GENERAL INDUSTRIAL MACHINERY & EQUIPMENT [3560]
		IRS NUMBER:				161194720
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			0331

	BUSINESS ADDRESS:	
		STREET 1:		20 FLORENCE AVE
		CITY:			BATAVIA
		STATE:			NY
		ZIP:			14020
		BUSINESS PHONE:		5853432216

	MAIL ADDRESS:	
		STREET 1:		20 FLORENCE AVENUE
		CITY:			BATAVIA
		STATE:			NY
		ZIP:			14020
</SEC-HEADER>
<DOCUMENT>
<TYPE>4
<SEQUENCE>1
<FILENAME>edgar.xml
<DESCRIPTION>PRIMARY DOCUMENT
<TEXT>
<XML>
<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0306</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2020-06-12</periodOfReport>

    <issuer>
        <issuerCik>0000716314</issuerCik>
        <issuerName>GRAHAM CORP</issuerName>
        <issuerTradingSymbol>GHM</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001615574</rptOwnerCik>
            <rptOwnerName>Schnorr Lisa M.</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>C/O GRAHAM CORPORATION</rptOwnerStreet1>
            <rptOwnerStreet2>20 FLORENCE AVENUE</rptOwnerStreet2>
            <rptOwnerCity>BATAVIA</rptOwnerCity>
            <rptOwnerState>NY</rptOwnerState>
            <rptOwnerZipCode>14020</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>1</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
            <officerTitle></officerTitle>
            <otherText></otherText>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <transactionDate>
                <value>2020-06-12</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>P</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionAmounts>
                <transactionShares>
                    <value>811</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>12.31</value>
                    <footnoteId id="F1"/>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>12214</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
    </nonDerivativeTable>

    <derivativeTable></derivativeTable>

    <footnotes>
        <footnote id="F1">The price reported is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $12.3032 to 12.32, inclusive. Ms. Schnorr undertakes to provide to Graham Corporation, any security holder of Graham Corporation, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares purchased at each separate price within the range set forth in this footnote.</footnote>
    </footnotes>

    <remarks></remarks>

    <ownerSignature>
        <signatureName>/s/ Jennifer R. Condame, Attorney-in-Fact for Lisa M. Schnorr</signatureName>
        <signatureDate>2020-06-15</signatureDate>
    </ownerSignature>
</ownershipDocument>
</XML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
