5/16-18 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 
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B & K FASTPACoupling NutSteelZinc/Clear5/16-18 x 7/85/16-18 x 7/8 short coupling nuts zinc b18.2.210
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B & K FASTPACoupling NutSteelZinc/Clear5/16-18 x 1 1/85/16-18 x 1 1/8 hex coupling nuts zinc b18.2.2451
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B & K FASTPACoupling Nut300 Stainless (A1,A2, 18-8,304,310 etc.)Plain5/16-18 x 15/16-18 x 1 stainless coupling nuts b18.2.279
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TSFTXCoupling Nut316, 317, A4 StainlessPlain5/16-18 x 1hex coupling nut 316 ss 5/16-18 x 11
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QCSORCoupling NutSteelPlain5/16-18 x 7/16 x 7/85/16-18 x 7/16 x 7/8 econo rod coupling nut plain300
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UNEEDANJCoupling NutSteelPlain5/16-18coupling nut274
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MTPCACoupling NutSteelPlain5/16-18 x 1 1/25/16-18 x 1 steel plain coupling nut 1/2 a/f800
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YANKEENHCoupling NutSteelZinc/Clear5/16-18 x 1 1/85/16-18 x 1-1/8 coupling nut steel zinc plated251
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YANKEENHCoupling NutSteelZinc/Clear5/16-18 x 7/85/16-18 x 7/8 coupling nut narrow zinc pltd21
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YANKEENHCoupling NutSteelZinc/Clear5/16-18 x 1 3/4coupling nut488
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ACFCACoupling NutSteelZinc/Clear5/16-185/16-18 economy rod coupling nut z/p rohs compliant75729
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NAPPCOTXCoupling NutSteelZinc/Clear5/16-18 x 1 3/4hex coupling nut steel zp 5/16-18x1-3/4400
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METRO INDOHCoupling NutSteelZinc/Clear5/16-18coupling nut uss970
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NutsBoltsNECoupling Nut300 Stainless (A1,A2, 18-8,304,310 etc.)Plain5/16-185/16-18 ss coupling nut23
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NutsBoltsNECoupling NutSteelZinc/Clear5/16-185/16-18 s coupling nut zp546
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NutsBoltsNECoupling NutSteelZinc/Clear5/16-185/16-18 l coupling nut zp49
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NutsBoltsNECoupling NutSteelZinc/Clear5/16-18 x 7/8 1/25/16-18 x 7/8 coupling nut zp 1/2 hex200
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ACCURATEILCoupling NutSteelZinc/Clear5/16-18 x 1 1/8hex coupling nut458
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ACCURATEILCoupling Nut300 Stainless (A1,A2, 18-8,304,310 etc.)Plain5/16-18 x 1hex coupling nuts 18-8 3046
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ASMCILCoupling NutGrade AZinc/Clear5/16-18 x 7/16 x 7/85/16-18xw7/16xl7/8 coarse a563 gra hex rod coupling nut low carb zp281
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ASMCILCoupling NutGrade AGalvanized5/16-18 x 1/25/16-18xw1/2xl1 3/4 coarse a563 gra hex rod coupling nut low carb hdg b18.2.2159
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AbabaCACoupling Nut300 Stainless (A1,A2, 18-8,304,310 etc.)Plain5/16-18 x 1 7/165/16-18 x 1 cplng nut 7/16 af s/s b18.2.241
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AbabaCACoupling Nut300 Stainless (A1,A2, 18-8,304,310 etc.)Plain5/16-18 x 1 7/165/16-18 x 1 cplng nut 7/16 af s/s b18.2.220
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AbabaCACoupling NutSteelZinc/Clear5/16-18 x 1 1/25/16-18 x 1 1/8 cplng nut 1/2 af stl znc b18.2.2456
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AbabaCACoupling NutSteelZinc/Clear5/16-18 x 1 1/25/16-18 x 1 1/8 cplng nut 1/2 af stl znc b18.2.2100
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AbabaCACoupling NutSteelZinc/Clear5/16-18 x 1 3/45/16-18 x 1 3/4 cplng nut stl znc b18.2.2150
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AbabaCACoupling Nut300 Stainless (A1,A2, 18-8,304,310 etc.)Plain5/16-18 x 7/85/16-18 x 7/8 cplng nut s/s b18.2.24
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AbabaCACoupling NutSteelZinc/Clear5/16-18 x 7/8 7/165/16-18 x 7/8 cplng nut 7/16 af stl znc b18.2.21700
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LippinCACoupling NutSteelZinc/Clear5/16-18 x 1 1/8coupling nut zinc plated13389
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LippinCACoupling NutSteelZinc/Clear5/16-18 x 1/2 x 7/8coupling nut zinc plated1450
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LippinCACoupling NutSteelZinc/Clear5/16-18 x 1/4reducer coupling nut zinc plated200
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LippinCACoupling Nut300 Stainless (A1,A2, 18-8,304,310 etc.)Plain5/16-18hex coupling nut stainless 18-850
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SIIINCoupling NutSteelZinc/Clear5/16-18 x 7/8 x 7/165/16-18 x l7/8 x w7/16 coupling nut zinc plated) b18.2.21460
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SIIINCoupling NutSteelZinc/Clear5/16-18 x 1 3/4 x 7/165/16-18 x l1-3/4 x w7/16 coupling nut zinc plated) b18.2.2300
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Future FastenerTXCoupling NutSteelZinc/Clear5/16-185/16-18 coupling nut plt9
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Future FastenerTXCoupling Nut300 Stainless (A1,A2, 18-8,304,310 etc.)Plain5/16-185/16-18 coupling nut ss40
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JacksonMSCoupling NutSteelZinc/Clear5/16-18nc heavy coupling nut 5/8 wafx1 3/4 oal135
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LippinCACoupling NutSteelZinc/Clear5/16-18 x 1 1/85/16-18 x 1 1/8 coup nut zn (1000)12800
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FastWareSaskCoupling NutGrade 2Zinc/Clear5/16-18 x 1/2afx1 nc coupling nut122
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QFCTXCoupling NutSteelZinc/Clear5/16-18 x 7/85/16-18 x 7/8 hex coupling nut zinc b18.2.21,000
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SRFALCoupling Nut300 Stainless (A1,A2, 18-8,304,310 etc.)Plain5/16-18 x 1coupling nut s/s436
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SRFALCoupling NutSteelZinc/Clear5/16-18 x 1 3/4coupling nut87
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SRFALCoupling NutSteelZinc/Clear5/16-18 x 7/8coupling nut1,251
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CNBILCoupling NutGrade 2Zinc/Clear5/16-18coupling nut gr.2 plate22
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EBN IndusINCoupling NutSteelZinc/Clear5/16-18 x 15/16-18 x 1 reducing coup nut 3/8-16 zinc b18.2.233
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ACFCACoupling NutSteelZinc/Clear5/16-185/16-18 rod coupling nut z/p rohs450
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CertifiedILCoupling NutSteelPlain5/16-18 x 7/85/16-18 x 7/8 hex coupling nut-zps. b18.2.21,500
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CertifiedILCoupling NutSteelPlain5/16-18 x 15/16-18 x 1 hex coupling nut-zps. b18.2.2200
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CertifiedILCoupling NutSteelPlain5/16-18 x 1 3/45/16-18 x 1-3/4 hex coupling nut plain b18.2.2500
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CertifiedILCoupling NutSteelPlain5/16-18 x 1 3/45/16-18 x 1-3/4 hex coupling nut-zps. b18.2.21,637
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CertifiedILCoupling NutSteelPlain5/16-18 x 1 1/85/16-18 x 1-1/8 short hex coupling nut-zps. b18.2.274
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DeltaTXCoupling NutSteelZinc/Clear5/16-18rod coupling nut zinc-econ 5/16-182620
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DeltaTXCoupling NutSteelZinc/Clear5/16-18rod coupling nut zinc 5/16-18208
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DeltaTXCoupling NutSteelZinc/Clear5/16-18coupling nut zinc 5/16-1889
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RCFastAZCoupling NutSteelZinc/Clear5/16-18 x 1 1/8hex coupling nut stl 13100
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RCFastAZCoupling NutGrade 5Zinc/Clear5/16-18 x 2hex gr5 coupling nut stl (1/2 hex)inquire
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RCFastAZCoupling NutGrade AZinc/Clear5/16-18hex coupling nut a563 gra cr+3 (7/16x7/8 economy)inquire
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RCFastAZCoupling NutGrade AZinc/Clear5/16-18hex coupling nut a563 gra cr+3 (1/2x1 3/4 regular)inquire
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RCFastAZCoupling NutGrade AZinc/Clear5/16-18hex coupling nut a563 gra cr+3 (1/2x1 1/8 economy)inquire
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RCFastAZCoupling NutGrade AZinc/Clear5/16-18hex coupling nut a563 gra cr+3 (5/8x1 3/4 economy)inquire
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RCFastAZCoupling NutGrade AZinc/Clear5/16-18hex coupling nut a563 gra cr+3 (1/2x1 economy)inquire
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RCFastAZCoupling NutGrade AZinc/Clear5/16-18hex coupling nut a563 gra cr+3 (7/16x7/8 economy)inquire
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RCFastAZCoupling NutGrade APlain5/16-18hex coupling nut a563 gra (1/2x1 3/4)inquire
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RCFastAZCoupling NutSteelGalvanized5/16-18hex coupling nut a563 hdg (1/2x1 3/4)inquire
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StandardMACoupling Nut300 Stainless (A1,A2, 18-8,304,310 etc.)Plain5/16-185/16-18 coupling nut 18-8 stainless steel b18.2.2inquire
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BAYFASTCOFLCoupling NutSteelZinc/Clear5/16-18 x 1 1/8coupling nut2400
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HBBOLTCACoupling NutSteelZinc/Clear5/16-18 x 1 3/4hex coupling nut607
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HBBOLTCACoupling NutSteelPlain5/16-18economy coupling nut 7/8150
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HBBOLTCACoupling Nut300 Stainless (A1,A2, 18-8,304,310 etc.)Plain5/16-18 x 1coupling nut 18-8 ss98
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THRDFASTFLCoupling NutSteelZinc/Clear5/16-18 x 1 3/4coupling nut b18.2.245
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THRDFASTFLCoupling NutSteelZinc/Clear5/16-18coupling nut b18.2.225
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LibertyILCoupling Nut300 Stainless (A1,A2, 18-8,304,310 etc.)Plain5/16-18rod coupling nut 7/8lg 1/2af 18-8 s/s 1/2af 18-8 s/s500
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LibertyILCoupling NutSteelZinc/Clear5/16-18 x 1 1/8rod coupling nut nut97
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NorthernMNCoupling NutSteelBlack Oxide5/16-18nc coupler nut black rie4037a349
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GUIDONNJCoupling NutSteelZinc/Clear5/16-18 x 7/81/2 hex850
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AFIFLCoupling NutSteelZinc/Clear5/16-18 x 1 1/25/16-18x1-1/8-1/2 hex coupling nut st zn600
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XL ScrewGACoupling NutSteelZinc/Clear5/16-18 x 7/16 x 7/8hex coupling nuts dc-dc zp2,000
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XL ScrewGACoupling NutSteelZinc/Clear5/16-18 x 1/2 x 1 1/8hex coupling nuts dc-dc zp900
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GLFOHCoupling NutSteelZinc/Clear5/16-18 x 1 3/4 x 5/8waf hex coupling nut zc nut98
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GLFOHCoupling NutSteelZinc/Clear5/16-18 x 1 3/4 x 1/2waf hex coupling nut zc nut402
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Kanebridge ILCoupling NutSteelZinc/Clear5/16-18 x 7/85/16-18x7/8 hex rod coupling nut 7/16 across flats zinc5,000
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Kanebridge ILCoupling NutSteelZinc/Clear5/16-18 x 1 1/85/16-18x1 1/8 hex rod coupling nut 1/2 inch across flats zinc5,000
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Kanebridge ILCoupling NutSteelZinc/Clear5/16-18 x 7/85/16-18x7/8 hex rod coupling nut 1/2 inch across flats zinc5,000
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Kanebridge ILCoupling NutSteelZinc/Clear5/16-18 x 1 3/45/16-18x1 3/4 hex rod coupling nut 1/2 inch across flats zinc5,000
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Kanebridge ILCoupling Nut300 Stainless (A1,A2, 18-8,304,310 etc.)Plain5/16-18 x 7/85/16-18x7/8 hex rod coupling nut 1/2 inch across flats 18-8 stainless steel4.375
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Kanebridge ILCoupling NutGrade 5Zinc/Clear5/16-18 x 1 1/85/16-18x1 1/8 hex rod coupling nut 1/2 inch across flats grade 5 zinc16.250
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KomarMOCoupling NutSteelZinc/Clear5/16-18 x 1 1/8lg. coupling nut50
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KomarMOCoupling NutSteelZinc/Clear5/16-18 x 1lg. coupling nut 1/2 dia2800
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All SizeTXCoupling NutSteelPlain5/16-18 x 7/85/16-18 x 7/8 short coupling nut b18.2.216
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All SizeTXCoupling NutSteelPlain5/16-18 x 1 3/45/16-18 x 1-3/4 coupling nut heavy b18.2.286
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Valley NuWACoupling NutSteelZinc/Black5/16-18 x 1 3/4nc hex coupling nut zb118
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Valley NuWACoupling Nut300 Stainless (A1,A2, 18-8,304,310 etc.)Plain5/16-18nc 18-8 ss coupling nut15
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TimberlineCOCoupling NutSteelZinc/Clear5/16-18 x 1 3/4rod cpl nut zn 5/16-18 x 1-3/4620
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TimberlineCOCoupling NutSteelZinc/Clear5/16-18 x 1 3/4rod cpl nut zn 5/16-18 x 1-3/42
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TimberlineCOCoupling NutSteelZinc/Clear5/16-18 x 1 3/4rod cpl nut zn 5/16-18 x 1-3/4286
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Alma BoltMICoupling NutSteelPlain5/16-18heavy(5/8 afx1 3/4) coupling nut2056
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Alma BoltMICoupling NutSteelZinc/Clear5/16-185/16-18 zinc plated(1/2x1 1/8) coupling nut1413
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Alma BoltMICoupling NutSteelZinc/Clear5/16-18(5/8afx1 3/4lg) coupling nut300
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