5/8 Hex Coupling Nuts

Coupling Nuts, also known as Extension Nuts, are threaded fastener for joining two male threaded objects, most commonly threaded rod, but also pipes. The outside of the coupling nut is usually a hex so it can be gripped by a wrench.

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SupplierLocTypeMaterialFinishSizeDescriptionQty 
AmericanNYCoupling Nut316, 317, A4 StainlessPlain5/8-11coupling nut 3160
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AmericanNYCoupling NutSteelPlain5/8-11 x 2 1/8 x 13/16coupling nut black1000
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AmericanNYCoupling Nut316, 317, A4 StainlessPlain5/8-11coupling nut 3168
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AmericanNYCoupling NutSteelGalvanized5/8-11 x 1 x 2 1/4coupling nut hdg23
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Zoro Tools Inc.Coupling NutSteelPlain5/8-11 x 1 5/8l coupling nut 5/8-11x1-5/8
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MESAFASTCACoupling NutSteelZinc/Clear5/8-11 x 2 1/8hex coupling nut5.0
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Cal FastenrsCACoupling NutSteelZinc/Clear5/8-11 x 2 1/8coupling nut Cr3+ coupling nut252
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B & K FASTPACoupling NutSteelZinc/Clear5/8-18 x 2 1/85/8-18 x 2 1/8 long coupling nuts zinc b18.2.24
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B & K FASTPACoupling Nut300 Stainless (A1,A2, 18-8,304,310 etc.)Plain5/8-11 x 1 3/45/8-11 x 1 3/4 stainless coupling nuts b18.2.26
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B & K FASTPACoupling NutSteelPlain5/8-11 x 2 1/85/8-11 x 2 1/8 long coupling nuts plain b18.2.2205
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B & K FASTPACoupling NutSteelZinc/Clear5/8-11 x 2 1/85/8-11 x 2 1/8 long coupling nuts zinc b18.2.2252
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B & K FASTPACoupling NutSteelGalvanized5/8-11 x 2 1/85/8-11 x 2 1/8 galv hex coupling nut b18.2.2114
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B & K FASTPACoupling NutSteelBlack Oxide5/8-11 x 1 5/85/8-11 x 1 5/8 heavy hex coupling nuts black heat treated b18.2.2230
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UNEEDANJCoupling NutSteelZinc/Clear5/8-11coupling nut42
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PENCOM CAOntCoupling NutSteelZinc/Clear5/8-11 x 2 1/85/8-11x2-1/8 hex coupling nut steel zinc 13/16waf75
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SunPackFLCoupling NutSteelGalvanized5/8-11 x 2coupling nut hdg2
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ManscoMICoupling NutSteelPlain5/8-11 x 2 1/2w/1-1/8 hex hvy coupling nut w/counterbore -per print7
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YANKEENHCoupling Nut300 Stainless (A1,A2, 18-8,304,310 etc.)Plain5/8-11 x 1 3/45/8-11 x 1-3/4 coupling nut 18-8 stainless steel15
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TSFTXCoupling NutSteelZinc/Clear5/8-11 x 2 1/8hex coupling nut steel zinc 5/8-11 x 2 1/885
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YANKEENHCoupling NutSteelZinc/Clear5/8-11coupling nut176
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NAPPCOTXCoupling NutSteelZinc/Clear5/8-11 x 35/8-11 x 3 coupling nut zp20
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NAPPCOTXCoupling NutSteelZinc/Clear5/8-11 x 2 1/8hex coupling nut steel zp 5/8-11x2 1/822
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HayesCACoupling NutSteelZinc/Clear5/8-11 x 2 3/45/8-11 x 2 3/4 coupling nut zinc2
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Set ScrewILCoupling NutSteelPlain5/8-11 x 1 1 1/8nut couplerinquire
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VertexDILCoupling Nut300 Stainless (A1,A2, 18-8,304,310 etc.)Plain5/8-11 13/16 x 2 1/85/8-11 coupling nut 13/16x2-1/8 18-8 ss15288
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METRO INDOHCoupling NutSteelZinc/Clear5/8-11coupling nut uss38
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NutsBoltsNECoupling NutSteelZinc/Clear5/8-115/8-11 coupling nut zp172
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NutsBoltsNECoupling NutSteelGalvanized5/8-115/8-11 coupling nut galv16
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AmericanNYCoupling NutSteelPlain5/8-11 x 2 1/8 x 13/16coupling nut black1000
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AmericanNYCoupling NutSteelGalvanized5/8-11 x 1 x 2 1/4coupling nut hdg23
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EndriesWICoupling NutSteelZinc/Clear5/8-11 x 13/16 x 2 1/85/8-11x13/16x2-1/8 coupling nut trivalent clear zinc 4/pk320
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EndriesWICoupling NutSteelPlain5/8-11 x 15/16 x 2 1/85/8-11x15/16x2-1/8 coupling nut plain404
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ACCURATEILCoupling NutSteelZinc/Clear5/8-11 x 2 1/8hex coupling nut36
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ACCURATEILCoupling NutSteelPlain5/8-18 x 2 1/8hex coupling nut220
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CenturyFLCoupling NutSteelPlain5/8-11 x 1 1/165/8-11 x 1 +-1/16 hex coupling nut86
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ManscoMICoupling NutSteelZinc/Clear5/8-11 x 2 1/8coupling nut 25/box116
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EmpireWACoupling NutSteelZinc/Clear5/8-11 x 2 1/85/8-11 x2-1/8 coupling nut zp100
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EmpireWACoupling NutSteelZinc/Clear5/8-11 x 2 1/85/8-11 x2-1/8 coupling nut zp299
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AbabaCACoupling Nut300 Stainless (A1,A2, 18-8,304,310 etc.)Plain5/8-11 x 1 3/45/8-11 x 1 3/4 cplng nut s/s b18.2.221
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AbabaCACoupling NutSteelGalvanized5/8-11 x 2 1/85/8-11 x 2 1/8 cplng nut stl hdg b18.2.215
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AbabaCACoupling NutSteelZinc/Clear5/8-11 x 2 1/85/8-11 x 2 1/8 cplng nut stl znc b18.2.2438
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AbabaCACoupling NutSteelZinc/Clear5/8-18 x 2 13/165/8-18 x 2 1/8 cplng nut 13/16 af stl znc b18.2.223
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LippinCACoupling NutSteelZinc/Clear5/8-11 x 1/2reducer coupling nut zinc plated680
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LippinCACoupling NutSteelZinc/Clear5/8-11coupling nut w/ sight-hole zinc plated10000
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LippinCACoupling NutSteelZinc/Clear5/8-11 x 2 1/8coupling nut zinc plated9100
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LippinCACoupling NutSteelZinc/Clear5/8-18coupling nut fine zinc plated39
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LippinCACoupling NutGrade 2HPlain5/8-11coupling nut heavy gr-2h plain50
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LippinCACoupling NutSteelPlain5/8-11coupling nut plain23906
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LippinCACoupling NutSteelGalvanized5/8-11coupling nut hot dipped galvanized28970
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LippinCACoupling NutSteelGalvanized5/8-11coupling nut w/ sight-hole hot dipped galvanized16013
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LippinCACoupling Nut300 Stainless (A1,A2, 18-8,304,310 etc.)Plain5/8-11hex coupling nut stainless 18-826
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JacksonMSCoupling NutSteelZinc/Clear5/8 x 13/16 x 2 1/85/8 ncx13/16x2 1/8 oal coupling nut945
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AbabaCACoupling NutSteelPlain5/8-11 x 2 1/85/8-11 x 2 1/8 cplng nut stl pln b18.2.26
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AbabaCACoupling NutSteelZinc/Clear5/8-11 x 3/45/8-11 x 3/4 redc cplng nut stl znc b18.2.25
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SIIINCoupling NutSteelZinc/Clear5/8-115/8-11 zinc rod coupling) b18.2.2135
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Future FastenerTXCoupling NutSteelZinc/Clear5/8-115/8-11 coupling nut plt10
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JacksonMSCoupling NutSteelZinc/Clear5/8-18 x 13/16 x 2 1/8oal fine thread coupling nut140
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JacksonMSCoupling NutSteelGalvanized5/8-11 x 13/16 x 2 1/8coupling nut hdg297
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JacksonMSCoupling Nut300 Stainless (A1,A2, 18-8,304,310 etc.)Plain5/8nc coupling nut 18-8 30428
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OlanderCACoupling NutSteelZinc/Clear5/8-11 x 2 1/85/8-11 x 2 1/8 cplng nut 13/16 hex stl zn127
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OlanderCACoupling NutSteelPlain5/8-11jergens 5/8-11 coupling nut8
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LippinCACoupling NutSteelZinc/Clear5/8-11 x 2 1/85/8-11 x 2 1/8 coup nut zn (250)7400
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LippinCACoupling NutSteelPlain5/8-115/8-11 coup nut plain (250)23506
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TownCountryARCoupling NutSteelPlain5/8-11 2 1/85/8-11 hex coupling nut 2 1/8 long plaininquire
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TownCountryARCoupling Nut300 Stainless (A1,A2, 18-8,304,310 etc.)Plain5/8-11 x 1 3/45/8-11 x 1 3/4 hex coupling nut s.s. 18-8inquire
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TownCountryARCoupling NutSteelZinc/Clear5/8-11hex coupling nut500
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QFCTXCoupling NutSteelZinc/Clear5/8-115/8-11 coupling nut zinc w/witness hole b18.2.2210
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QFCTXCoupling NutSteelPlain5/8-11 13/16 x 2 1/85/8-11 hex coupling nut plain 13/16x2 1/8 b18.2.2180
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BrikksenFLCoupling Nut316, 317, A4 StainlessPlain5/8-11 x 1 3/45/8-11 x 1-3/4 coup nut 316s/s b18.2.2190
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EBN IndusINCoupling Nut316, 317, A4 StainlessPlain5/8-11 x 1 3/45/8-11 x 1 3/4 coupling nut 316 s/s b18.2.246
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EBN IndusINCoupling NutSteelZinc/Clear5/8-18 x 2 1/85/8-18 x 2 1/8 coupling nut zinc b18.2.216
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CertifiedILCoupling Nut300 Stainless (A1,A2, 18-8,304,310 etc.)Plain5/8-11 x 1 3/45/8-11 x 1 3/4 hex coupling nut/18-8 b18.2.293
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CertifiedILCoupling NutSteelPlain5/8-11 x 2 1/85/8-11 x 2-1/8 hex coupling nut-zps. b18.2.2425
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CertifiedILCoupling NutSteelZinc/Clear5/8-115/8-11 to 1/2-13 hex reducing coupling nut zps. b18.2.2406
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DeltaTXCoupling NutSteelZinc/Clear5/8-11rod coupling nut zinc 5/8-11110
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DeltaTXCoupling Nut300 Stainless (A1,A2, 18-8,304,310 etc.)Plain5/8-11rod coupling nut 18-8 sst 5/8-11862
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RCFastAZCoupling NutGrade AZinc/Clear5/8-11hex coupling nut a563 gra cr+3 (13/16x2 1/8 regular)inquire
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RCFastAZCoupling NutGrade AZinc/Clear5/8-18hex coupling nut a563 gra cr+3 (13/16x2 1/8 economy)inquire
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RCFastAZCoupling NutGrade APlain5/8-11hex coupling nut a563 gra (13/16x2 1/8)inquire
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RCFastAZCoupling NutGrade APlain5/8-18hex coupling nut a563 gra (13/16x2 1/8)inquire
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RCFastAZCoupling NutSteelGalvanized5/8-11hex coupling nut a563 hdg (13/16x2 1/8)inquire
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HodellOHCoupling NutSteelGalvanized5/8-11 x 13/16 x 2 1/85/8-11 x 13/16 x 2 1/8 a563 a hex coupling nut h.d.galv.16
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HodellOHCoupling NutSteelZinc/Clear5/8 x 1/25/8 x 1/2 reducing cplng nut zinc250
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StandardMACoupling Nut300 Stainless (A1,A2, 18-8,304,310 etc.)Plain5/8-115/8-11 coupling nut 18-8 stainless steel b18.2.2inquire
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StandardMACoupling NutSteelGalvanized5/8-115/8-11 coupling nut galvanized b18.2.2inquire
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BHAMTXCoupling NutSteelZinc/Clear5/8-11 x 2 1/8coupling nut zn125
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ASFCORPMICoupling NutGrade 2Zinc/Clear5/8-11 x 2 1/85/8-11 x 2 1/8 hex coupling nut sae j995 gr 2 tri zn fe/zn 5an60
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ASFCORPMICoupling NutGrade 2Zinc/Clear5/8-11 x 2 1/85/8-11 x 2 1/8 hex coupling nut sae j995 gr 2 tri zn fe/zn 5an pkg4
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HBBOLTCACoupling NutSteelZinc/Clear5/8-11 x 2 1/8hex coupling nut274
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HBBOLTCACoupling NutSteelGalvanized5/8-11coupling nuts hd325
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HBBOLTCACoupling Nut300 Stainless (A1,A2, 18-8,304,310 etc.)Plain5/8-11coupling nuts 18-8 ss17
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OBRIENOHCoupling NutSteelZinc/Clear5/8-11hex coupling nut 2 1/8190
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THRDFASTFLCoupling NutSteelPlain5/8-11coupling nut b18.2.2198
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THRDFASTFLCoupling NutSteelZinc/Clear5/8-11reducing coupling nut 1/2-13 b18.2.2267
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THRDFASTFLCoupling NutSteelZinc/Clear5/8nf-18 coupling nut b18.2.218
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THRDFASTFLCoupling NutSteelPlain5/8-11coupling nut b18.2.2107
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THRDFASTALCoupling NutSteelPlain5/8-11coupling nut b18.2.211
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KBSTNCoupling NutSteelPlain5/8-11 x 2 1/85/8-11 x 2 1/8 hvy coupling nut b18.2.2109
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KBSTNCoupling NutSteelPlain5/8-18 x 1 7/85/8-18 x 1 7/8 hvy coupling nut 15/16 hex b18.2.2467
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KBSTNCoupling Nut300 Stainless (A1,A2, 18-8,304,310 etc.)Plain5/8-11 x 2 1/85/8-11 x 2 1/8 coupling nut 13/16hex s/s b18.2.280
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THRDFASTALCoupling Nut300 Stainless (A1,A2, 18-8,304,310 etc.)Plain5/8-11 x 1 3/418-8 ss coupling nut b18.2.2177
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THRDFASTALCoupling Nut316, 317, A4 StainlessPlain5/8-11 x .16mmx1 1/2 t-316l coupling nut b18.2.229
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THRDFASTOKCoupling NutSteelZinc/Clear5/8-11coupling nut b18.2.225
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WSBKYCoupling NutGrade 2Plain5/8-11 x 2 13/16nut hex coupling gr2 (pl) 5/8-11x2 1/8 13/16 b18.2.21,165
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LibertyILCoupling Nut300 Stainless (A1,A2, 18-8,304,310 etc.)Plain5/8-11rod coupling nut 18-8 s/s 18-8 s/s6
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LibertyILCoupling NutSteelZinc/Clear5/8-11rod coupling nut224
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LibertyILCoupling NutSteelGalvanized5/8-11rod coupling nut 2-1/8 long117
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HewesNYCoupling NutSteelZinc/Clear5/8-11 x 2 1/8coupling nut pl106
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HewesNYCoupling Nut316, 317, A4 StainlessPlain5/8-11 x 2 1/8coupling nut316 s/s74
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XL ScrewGACoupling NutSteelZinc/Clear5/8-11 x 13/16 x 2 1/8hex coupling nuts dc-dc zp250
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MasFasCorpNVCoupling NutSteelZinc/Clear5/8-11heavy hex coupling nut domesticinquire
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MasFasCorpNVCoupling NutSteelZinc/Clear5/8-11coupling nutinquire
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GLFOHCoupling NutSteelZinc/Clear5/8-11 x 2 13/165/8-11x2-1/8 hex coupling nut 13/16 af stl zc242
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GLFOHCoupling NutSteelPlain5/8-11 x 2 1/8hex coupling nut 13/16 af nut155
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Kanebridge ILCoupling NutSteelZinc/Clear5/8-11 x 2 1/85/8-11x2 1/8 hex rod coupling nut 13/16 inch across flats zinc2.500
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Kanebridge ILCoupling NutSteelZinc/Clear5/8-18 x 2 1/85/8-18x2 1/8 hex rod coupling nut 13/16 inch across flats zinc2.500
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Kanebridge ILCoupling NutSteelZinc/Clear5/8-11 x 1 7/85/8-11x1 7/8 hex rod coupling nut 13/16 inch across flats zinc5,000
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Kanebridge ILCoupling NutSteelZinc/Clear5/8-11 x 3 13/165/8-11x3-13/16 hex rod coupling nut 13/16 inch across flats zinc1.500
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Kanebridge ILCoupling Nut300 Stainless (A1,A2, 18-8,304,310 etc.)Plain5/8-11 x 2 1/85/8-11x2 1/8 hex rod coupling nut 13/16 inch across flats 18-8 stainless steel1.125
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Kanebridge ILCoupling NutSteelZinc/Clear5/8-11 x 1 1/45/8-11x1 1/4 reduced hex rod coupling nut, 1/2-13, 13/16 across flats zinc2.500
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MAINSOURCNHCoupling NutSteelZinc/Clear5/8-11coupling nut254
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Valley NuWACoupling NutGrade DHPlain5/8-11 x 31 1/8 a563 dh hvy hex cplng nut pl usa2
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Valley NuWACoupling NutSteelGalvanized5/8-11 x 2 1/8 x 13/16nc hex coupling nut hdg150
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Valley NuWACoupling NutSteelPlain5/8-11 x 2 1/8nc hex coupling nut pl135
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Valley NuWACoupling Nut300 Stainless (A1,A2, 18-8,304,310 etc.)Plain5/8-11ncx1 3/4 18-8 ss coupling nut7
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Valley NuWACoupling Nut300 Stainless (A1,A2, 18-8,304,310 etc.)Plain5/8-11 x 7/8afx1 3/4 18-8ss economy coupling nut1
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Valley NuWACoupling NutSteelZinc/Black5/8-18 x 2 1/8nf hex cplng economy nut zb37
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Valley NuWACoupling NutSteelZinc/Black5/8-11 x 1/2nc hex reduc-cplg nut zb163
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Valley NuWACoupling NutSteelZinc/Black5/8-11 x 2 1/8nc hex coupling nut zb124
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TimberlineCOCoupling NutSteelZinc/Clear5/8-11 x 2 1/8rod cpl nut zn 5/8-11 x 2-1/8630
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TimberlineCOCoupling NutSteelZinc/Clear5/8-11 x 2 1/8rod cpl nut zn 5/8-11 x 2-1/81182
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Alma BoltMICoupling NutSteelPlain5/8-18SAE (13/16afx2 1/8lg) coupling nut377
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ACCURATEILCoupling NutSteelZinc/Clear5/8-18 x 2 1/8 x 13/16coupling nut s250
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AMC IncCACoupling NutGrade 2Zinc/Clear5/8-11coupling nut150
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