<SEC-DOCUMENT>0001140361-15-013206.txt : 20150325
<SEC-HEADER>0001140361-15-013206.hdr.sgml : 20150325
<ACCEPTANCE-DATETIME>20150325182159
ACCESSION NUMBER:		0001140361-15-013206
CONFORMED SUBMISSION TYPE:	4/A
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20150319
FILED AS OF DATE:		20150325
DATE AS OF CHANGE:		20150325

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			NN INC
		CENTRAL INDEX KEY:			0000918541
		STANDARD INDUSTRIAL CLASSIFICATION:	BALL & ROLLER BEARINGS [3562]
		IRS NUMBER:				621096725
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	BUSINESS ADDRESS:	
		STREET 1:		207 MOCKINGBIRD LANE
		CITY:			JOHNSON CITY
		STATE:			TN
		ZIP:			37604
		BUSINESS PHONE:		4237439151

	MAIL ADDRESS:	
		STREET 1:		207 MOCKINGBIRD LANE
		CITY:			JOHNSON CITY
		STATE:			TN
		ZIP:			37604

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	NN BALL & ROLLER INC
		DATE OF NAME CHANGE:	19940203

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			DRIES WILLIAM
		CENTRAL INDEX KEY:			0001176412

	FILING VALUES:
		FORM TYPE:		4/A
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	000-23486
		FILM NUMBER:		15725800

	MAIL ADDRESS:	
		STREET 1:		C/O POLYPORE INTERNATIONAL, INC.
		STREET 2:		11430 N. COMMUNITY HOUSE ROAD, SUITE 350
		CITY:			CHARLOTTE
		STATE:			NC
		ZIP:			28277
</SEC-HEADER>
<DOCUMENT>
<TYPE>4/A
<SEQUENCE>1
<FILENAME>doc1.xml
<DESCRIPTION>FORM 4/A
<TEXT>
<XML>
<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0306</schemaVersion>

    <documentType>4/A</documentType>

    <periodOfReport>2015-03-19</periodOfReport>

    <dateOfOriginalSubmission>2015-03-23</dateOfOriginalSubmission>

    <notSubjectToSection16>0</notSubjectToSection16>

    <issuer>
        <issuerCik>0000918541</issuerCik>
        <issuerName>NN INC</issuerName>
        <issuerTradingSymbol>NNBR</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001176412</rptOwnerCik>
            <rptOwnerName>DRIES WILLIAM</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>207 MOCKINGBIRD LANE</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>JOHNSON CITY</rptOwnerCity>
            <rptOwnerState>TN</rptOwnerState>
            <rptOwnerZipCode>37604</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>2015-03-19</value>
            </transactionDate>
            <deemedExecutionDate></deemedExecutionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>A</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionAmounts>
                <transactionShares>
                    <value>4500</value>
                    <footnoteId id="F1"/>
                </transactionShares>
                <transactionPricePerShare>
                    <value>0</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>18500</value>
                    <footnoteId id="F1"/>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
    </nonDerivativeTable>

    <derivativeTable></derivativeTable>

    <footnotes>
        <footnote id="F1">The reporting person is filing this Form 4/A to amend the reporting person's Form 4 filed on March 23, 2015, which inadvertently omitted 700 shares from Columns 4 and 5 of Table I.  These 700 shares are restricted stock, which vest over a period of three years in equal annual installments beginning on March 19, 2016.</footnote>
    </footnotes>

    <remarks></remarks>

    <ownerSignature>
        <signatureName>/s/ William C. Kelly, Jr. by Power of Attorney</signatureName>
        <signatureDate>2015-03-25</signatureDate>
    </ownerSignature>
</ownershipDocument>
</XML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
