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5/8-18 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.

16 results, (click on any line for more information)
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SupplierLocTypeMaterialFinishSizeDescriptionQty 
Buy Hex Coupling Nuts from one of our FCH Network Members
WeaverWACoupling NutSteelZinc/Clear5/8-185/8-18 coupling nut zinc76
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JacksonMSCoupling NutSteelZinc/Clear5/8-18 x 13/16 x 2 1/8oal fine thread coupling nut134
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ACCURATEILCoupling NutSteelPlain5/8-18 x 2 1/8hex coupling nut400
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OneMonroeNCCoupling NutSteelZinc/Clear5/8-18 x 13/16 x 2 1/85/8-18 x 2-1/8 coupling nut zinc plated10
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OneMonroeMACoupling NutSteelPlain5/8-18 x 13/16 x 2 1/85/8-18 x 2-1/8 x 13/16 coupling nut steel plain90
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Alma BoltMICoupling NutSteelPlain5/8-18SAE (13/16afx2 1/8lg) coupling nut79
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OneMonroeMACoupling NutSteelZinc/Clear5/8-18 x 13/16 x 2 1/85/8-18 x 2-1/8 coupling nut zinc plated 5/8-18 x 2-1/8 coupling nut zinc10
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Raw ProduNJCoupling Nut300 Stainless (A1,A2, 18-8,304,310 etc.)Plain5/8-18 x 13/16coupling nuts 304 ss 5/8-1840
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Fastener OHCoupling NutGrade AZinc/Clear5/8-18 x 2 1/8coupling nut 5/8-18x2-1/8 (13/16 wide hex) a563 grade a zinc plated 14
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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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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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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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LippinCACoupling NutSteelZinc/Clear5/8-18coupling nut fine zinc plated39
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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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Valley NuWACoupling NutSteelZinc/Black5/8-18 x 2 1/8nf hex cplng economy nut zb37
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ACCURATEILCoupling NutSteelZinc/Clear5/8-18 x 2 1/8 x 13/16coupling nuts250
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