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.
126 results, (click on any line for more information)
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Supplier | Loc | Type | Material | Finish | Size | Description | Qty | |
Buy Hex Coupling Nuts from one of our FCH Network Members | ||||||||
Weaver | WA | Coupling Nut | 300 Stainless (A1,A2, 18-8,304,310 etc.) | Plain | 5/16-18 | 5/16-18 coupling nut 18-8 ss | 100 |
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Weaver | WA | Coupling Nut | Steel | Plain | 5/16-18 x 1 3/4 | 5/16-18x1 3/4 coupling nut plain | 350 |
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Weaver | WA | Coupling Nut | Steel | Zinc/Clear | 5/16-18 x 1 3/4 | 5/16-18x1 3/4 coupling nut zinc | 47 |
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Jackson | MS | Coupling Nut | Steel | Zinc/Clear | 5/16-18 | nc heavy coupling nut 5/8 wafx1 3/4 oal | 135 |
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METRO IND | OH | Coupling Nut | Steel | Zinc/Clear | 5/16-18 | coupling nut uss | 870 |
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Weaver | WA | Coupling Nut | Steel | Plain | 5/16-18 x 7/8 | 5/16-18x7/8 short coupling nut plain | 300 |
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Weaver | WA | Coupling Nut | Steel | Zinc/Clear | 5/16-18 x 7/8 | 5/16-18x7/8 short coupling nut zinc | 1996 |
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YANKEE | NH | Coupling Nut | Steel | Zinc/Clear | 5/16-18 x 1 1/8 | 5/16-18 x 1-1/8 coupling nut steel zinc plated | 251 |
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YANKEE | NH | Coupling Nut | Steel | Zinc/Clear | 5/16-18 x 7/8 | 5/16-18 x 7/8 coupling nut narrow zinc pltd | 21 |
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YANKEE | NH | Coupling Nut | Steel | Zinc/Clear | 5/16-18 x 1 3/4 | coupling nut | 488 |
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Endries | WI | Coupling Nut | Steel | Zinc/Clear | 5/16-18 x 1/2 x 1 3/4 | 5/16-18x1-3/4 coupling nut 1/2 width across flats trivalent clear zinc | 68552 |
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Endries | WI | Coupling Nut | Steel | Zinc/Clear | 5/16-18 x 7/16 x 7/8 | 5/16-18x7/16x7/8 coupling nut zinc | 1800 |
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Endries | WI | Coupling Nut | Steel | Plain | 5/16-18 x 1/2 x 7/8 | 5/16-18 x 7/8 coupling nut stl | 830 |
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Brikksen | FL | Coupling Nut | 300 Stainless (A1,A2, 18-8,304,310 etc.) | Plain | 5/16-18 x 1/2 x 1 | 5/16-18 x 1 hex coupling nut 18-8 ss | 20 |
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Brikksen | FL | Coupling Nut | 316, 317, A4 Stainless | Plain | 5/16-18 x 1/2 | 5/16-18 coupling nut 1 long-316ss | 200 |
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Brikksen | FL | Coupling Nut | 316, 317, A4 Stainless | Plain | 5/16-18 x 1/2 | 5/16-18 coupling nut 1 long-316ss | inquire |
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Brikksen | FL | Coupling Nut | 300 Stainless (A1,A2, 18-8,304,310 etc.) | Plain | 5/16-18 x 1/2 x 1 | 5/16-18 x 1 hex coupling nut 18-8 ss | 1000 |
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Brikksen | FL | Coupling Nut | 300 Stainless (A1,A2, 18-8,304,310 etc.) | Plain | 5/16-18 x 1/2 x 1 | 5/16-18 x 1 hex coupling nut 18-8 ss | inquire |
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Brikksen | FL | Coupling Nut | 316, 317, A4 Stainless | Plain | 5/16-18 x 1/2 | 5/16-18 coupling nut 1 long-316ss | inquire |
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Brikksen | FL | Coupling Nut | 300 Stainless (A1,A2, 18-8,304,310 etc.) | Plain | 5/16-18 x 1/2 x 1 | 5/16-18 x 1 hex coupling nut 18-8 ss | inquire |
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Brikksen | FL | Coupling Nut | 316, 317, A4 Stainless | Plain | 5/16-18 x 1/2 | 5/16-18 coupling nut 1 long-316ss | inquire |
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Brikksen | FL | Coupling Nut | 300 Stainless (A1,A2, 18-8,304,310 etc.) | Plain | 5/16-18 x 1/2 x 1 | 5/16-18 x 1 hex coupling nut 18-8 ss | inquire |
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Brikksen | FL | Coupling Nut | 316, 317, A4 Stainless | Plain | 5/16-18 x 1/2 | 5/16-18 coupling nut 1 long-316ss | 1000 |
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Brikksen | FL | Coupling Nut | 300 Stainless (A1,A2, 18-8,304,310 etc.) | Plain | 5/16-18 x 1/2 x 1 | 5/16-18 x 1 hex coupling nut 18-8 ss | 400 |
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Brikksen | FL | Coupling Nut | 316, 317, A4 Stainless | Plain | 5/16-18 x 1/2 | 5/16-18 coupling nut 1 long-316ss | inquire |
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Brikksen | FL | Coupling Nut | 300 Stainless (A1,A2, 18-8,304,310 etc.) | Plain | 5/16-18 x 1/2 x 1 | 5/16-18 x 1 hex coupling nut 18-8 ss | inquire |
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Brikksen | FL | Coupling Nut | 316, 317, A4 Stainless | Plain | 5/16-18 x 1/2 | 5/16-18 coupling nut 1 long-316ss | inquire |
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GLF | OH | Coupling Nut | Steel | Zinc/Clear | 5/16-18 x 5/8 x 1-3/4 | 5/16-18 x 1-3/4 x 5/8 waf hex coupling nut stl zc | 96 |
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GLF | OH | Coupling Nut | Steel | Zinc/Clear | 5/16-18 x 1/2 x 1-3/4 | 5/16-18 x 1-3/4 x 1/2 waf hex coupling nut stl zc | 202 |
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SWACO | OH | Coupling Nut | Steel | Zinc/Clear | 5/16-18 x 7/8 | 5/16-18x7/8 coupling nut zinc | 193 |
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SWACO | OH | Coupling Nut | Steel | Zinc/Clear | 5/16-18 x 1 1/8 | 5/16-18x1 1/8 coupling nut zinc | 402 |
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SWACO | OH | Coupling Nut | Plain | 5/16-18 x 1/2 x 1 3/4 | 5/16-18xw1/2xl1 3/4 hx coupling nut | 200 |
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MTP | CA | Coupling Nut | Steel | Plain | 5/16-18 x 1 1/2 | 5/16-18 x 1 steel plain coupling nut 1/2 a/f | 800 |
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CNB | IL | Coupling Nut | Grade 2 | Zinc/Clear | 5/16-18 x 1/2 | 5/16-18 coupling nut gr.2 zinc plate | 22 |
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NAPPCO | TX | Coupling Nut | Steel | Zinc/Clear | 5/16-18 x 1 3/4 | hex coupling nut steel zp 5/16-18x1-3/4 | 100 |
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NAPPCO | TX | Coupling Nut | Steel | Zinc/Clear | 5/16-18 x 1 3/4 | hex coupling nut steel zp 5/16-18x1-3/4 | 800 |
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ACCURATE | IL | Coupling Nut | Steel | Zinc/Clear | 5/16-18 x 1 3/4 | 5/16-18x1 3/4 hex coupling nut zinc | 310 |
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ACCURATE | IL | Coupling Nut | 300 Stainless (A1,A2, 18-8,304,310 etc.) | Plain | 5/16-18 x 1 | hex coupling nuts 18-8 304 | 56 |
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Brikksen | FL | Coupling Nut | 316, 317, A4 Stainless | Plain | 5/16-18 x 1/2 | 5/16-18 coupling nut 1 long-316ss | inquire |
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Brikksen | FL | Coupling Nut | 300 Stainless (A1,A2, 18-8,304,310 etc.) | Plain | 5/16-18 x 1/2 x 1 | 5/16-18 x 1 hex coupling nut 18-8 ss | inquire |
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UNEEDA | NJ | Coupling Nut | Steel | Plain | 5/16-18 | coupling nut | 274 |
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Endries | WI | Coupling Nut | Steel | Plain | 5/16-18x1/2x7/8 coupling nut enviro-black hex free 500hr to red | 840 |
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A-Plus Co | OR | Coupling Nut | Plain | 5/16-18 x 1/2 | 5/16-18 coupling nut nc | 369 |
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OneMonroe | NC | Coupling Nut | 300 Stainless (A1,A2, 18-8,304,310 etc.) | Plain | 5/16-18 x 1/2 | 5/16-18 coupling nut stainless | 26 |
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OneMonroe | NC | Coupling Nut | Steel | Zinc/Clear | 5/16-18 x 1/2 | 5/16-18 heavy coupling nut plated | 185 |
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Alma Bolt | MI | Coupling Nut | Plain | 5/16-18 | 5/16-18 & 3/8-16 | reducer coupling nut | 1034 |
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Alma Bolt | MI | Coupling Nut | Plain | 5/16-18 | 5/16-18 & 3/8-16 | reducer coupling nut | 98 |
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Alma Bolt | MI | Coupling Nut | Steel | Plain | 5/16-18 | heavy(5/8 afx1 3/4) coupling nut | 2046 |
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Alma Bolt | MI | Coupling Nut | Steel | Zinc/Clear | 5/16-18 | 5/16-18 zinc plated(1/2x1 1/8) coupling nut | 155 |
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Alma Bolt | MI | Coupling Nut | Steel | Zinc/Clear | 5/16-18 | (5/8afx1 3/4lg) coupling nut | 82 |
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NutsBolts | NE | Coupling Nut | 300 Stainless (A1,A2, 18-8,304,310 etc.) | Plain | 5/16-18 | 5/16-18 ss coupling nut | 54 |
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NutsBolts | NE | Coupling Nut | Steel | Zinc/Clear | 5/16-18 | 5/16-18 s coupling nut zp | 536 |
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NutsBolts | NE | Coupling Nut | Steel | Zinc/Clear | 5/16-18 | 5/16-18 l coupling nut zp | 50 |
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NutsBolts | NE | Coupling Nut | Steel | Zinc/Clear | 5/16-18 x 7/8 1/2 | 5/16-18 x 7/8 coupling nut zp 1/2 hex | 926 |
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OneMonroe | MA | Coupling Nut | Grade 2 | Plain | 5/16-18 x 1/2 x 7/8 | 5/16-18 x 7/8 l x 1/2 af coupling nut grade 2-steel/plain | 464 |
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OneMonroe | MA | Coupling Nut | 300 Stainless (A1,A2, 18-8,304,310 etc.) | Plain | 5/16-18 x 1/2 | 5/16-18 coupling nut stainless | 26 |
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OneMonroe | MA | Coupling Nut | Steel | Zinc/Clear | 5/16-18 x 1/2 | 5/16-18 heavy coupling nut plated | 185 |
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Liberty | IL | Coupling Nut | Steel | Zinc/Clear | 5/16-18 x 1/2 | 5/16-18x1/2 afx1-3/4 long rod coupling nut zinc | 500 |
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Liberty | IL | Coupling Nut | 300 Stainless (A1,A2, 18-8,304,310 etc.) | Plain | 5/16-18 | rod coupling nut 7/8lg 1/2af 18-8 s/s 1/2af 18-8 s/s | 500 |
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Liberty | IL | Coupling Nut | Steel | Zinc/Clear | 5/16-18 x 1 1/8 | rod coupling nut nut | 97 |
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Liberty | IL | Coupling Nut | Steel | Plain | 5/16-18 x 1/2 af x 1-3/4 long rod coupling nut plain | 1,350 |
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American | WI | Coupling Nut | 300 Stainless (A1,A2, 18-8,304,310 etc.) | Plain | 5/16-18 x 1/2 | 5/16-18 nc hex coupling nut #18-8 ss | 342 |
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American | WI | Coupling Nut | Grade 2 | Plain | 5/16-18 x 1/2 x 1 3/4 | 5/16-18x1-3/4 nc hex coupling nut gr 2 plain | 485 |
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Future Fastener | TX | Coupling Nut | Steel | Zinc/Clear | 5/16-18 | 5/16-18 coupling nut plt | 9 |
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Future Fastener | TX | Coupling Nut | 300 Stainless (A1,A2, 18-8,304,310 etc.) | Plain | 5/16-18 | 5/16-18 coupling nut ss | 19 |
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Raw Produ | NJ | Coupling Nut | Aluminum | Plain | 5/16-18 x 1/2 | coupling nuts aluminum 5/16-18 | 143 |
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Raw Produ | NJ | Coupling Nut | 316, 317, A4 Stainless | Plain | 5/16-18 x 1/2 | coupling nuts 316 ss 5/16-18 | 85 |
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Raw Produ | NJ | Coupling Nut | Steel | Zinc/Clear | 5/16-18 x 1/2 x 1 3/4 | coupling nuts zinc 5/16-18 x 1-3/4 | 213 |
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Raw Produ | NJ | Coupling Nut | 300 Stainless (A1,A2, 18-8,304,310 etc.) | Plain | 5/16-18 x 1/2 | coupling nuts 304 ss 5/16-18 | 2574 |
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Raw Produ | NJ | Coupling Nut | Steel | Galvanized | 5/16-18 x 1/2 | coupling nuts hdg 5/16-18 | 450 |
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Endries | WI | Coupling Nut | 300 Stainless (A1,A2, 18-8,304,310 etc.) | Plain | 5/16-18 x 1/2 x 1 | 5/16-18x1 18-8 stainless steel coupling nut 7/16 width across flats | 100 |
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QCS | OR | Coupling Nut | Steel | Plain | 5/16-18 x 7/16 x 7/8 | 5/16-18x7/16x7/8 econo rod coupling nut plain | 300 |
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RCFast | AZ | Coupling Nut | Steel | Zinc/Clear | 5/16-18 x 1 1/8 | hex coupling nut stl 1 | 3100 |
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Fastener | OH | Coupling Nut | Steel | Zinc/Clear | 5/16-18 x 7/8 | coupling nut 5/16-18x7/8 zinc plated | 1130 |
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Fastener | OH | Coupling Nut | Steel | Zinc/Clear | 5/16-18 x 1 1/8 | coupling nut 5/16-18x1-1/8 zinc plated | 3 |
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National | Ont | Coupling Nut | Steel | Zinc/Clear | 5/16-18 x 1/2 x 7/8 | 5/16-18x7/8 hex coupling nut sz 5/8 hex | 1408 |
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National | Ont | Coupling Nut | Steel | Zinc/Clear | 5/16-18 x 1/2 x 7/8 | 5/16-18x7/8 hex coupling nut sz | 2000 |
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Ababa | CA | Coupling Nut | 300 Stainless (A1,A2, 18-8,304,310 etc.) | Plain | 5/16-18 x 1 7/16 | 5/16-18 x 1 cplng nut 7/16 af s/s b18.2.2 | 81 |
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Ababa | CA | Coupling Nut | Steel | Zinc/Clear | 5/16-18 x 1 1/2 | 5/16-18 x 1 1/8 cplng nut 1/2 af stl znc b18.2.2 | 520 |
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Ababa | CA | Coupling Nut | 300 Stainless (A1,A2, 18-8,304,310 etc.) | Plain | 5/16-18 x 7/8 | 5/16-18 x 7/8 cplng nut s/s b18.2.2 | 4 |
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Ababa | CA | Coupling Nut | Steel | Zinc/Clear | 5/16-18 x 7/8 7/16 | 5/16-18 x 7/8 cplng nut 7/16 af stl znc b18.2.2 | 900 |
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AFI | FL | Coupling Nut | Steel | Zinc/Clear | 5/16-18 x 1/2 x 7/8-1/2 | 5/16-18x7/8-1/2 coupling nut stz rohs () () | 900 |
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Ababa | CA | Coupling Nut | 300 Stainless (A1,A2, 18-8,304,310 etc.) | Plain | 5/16-18 x 1 7/16 | 5/16-18 x 1 cplng nut 7/16 af s/s b18.2.2 | 20 |
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Ababa | CA | Coupling Nut | Steel | Zinc/Clear | 5/16-18 x 1 1/2 | 5/16-18 x 1 1/8 cplng nut 1/2 af stl znc b18.2.2 | 100 |
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Ababa | CA | Coupling Nut | Steel | Zinc/Clear | 5/16-18 x 1 3/4 | 5/16-18 x 1 3/4 cplng nut stl znc b18.2.2 | 150 |
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XL Screw | GA | Coupling Nut | Steel | Zinc/Clear | 5/16-18 x 7/16 x 7/8 | hex coupling nuts dc-dc zp | 2,000 |
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XL Screw | GA | Coupling Nut | Steel | Zinc/Clear | 5/16-18 x 1/2 x 1 1/8 | hex coupling nuts dc-dc zp | 900 |
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Express | CA | Coupling Nut | Steel | Plain | 5/16-18 x 7/16 x 7/8 | 5/16-18x7/16x7/8 coupling nut econo plain | 150 |
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SII | IN | Coupling Nut | Steel | Zinc/Clear | 5/16-18 x 7/8 x 7/16 | 5/16-18 x l7/8 x w7/16 coupling nut zinc plated) b18.2.2 | 1339 |
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SII | IN | Coupling Nut | Steel | Zinc/Clear | 5/16-18 x 1 3/4 x 7/16 | 5/16-18 x l1-3/4 x w7/16 coupling nut zinc plated) b18.2.2 | 250 |
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IPC | VA | Coupling Nut | Steel | Zinc/Clear | 5/16-18 x 7/16 | 5/16-18x7/16 hex coupling nut steel cr3 zinc-rohs 7/8 long | 75 |
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Northern | MN | Coupling Nut | Steel | Black Oxide | 5/16-18 | nc coupler nut black rie4037a | 349 |
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HBBOLT | CA | Coupling Nut | Steel | Zinc/Clear | 5/16-18 x 1 3/4 | hex coupling nut | 607 |
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HBBOLT | CA | Coupling Nut | Steel | Plain | 5/16-18 | economy coupling nut 7/8 | 150 |
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HBBOLT | CA | Coupling Nut | 300 Stainless (A1,A2, 18-8,304,310 etc.) | Plain | 5/16-18 x 1 | coupling nut 18-8 ss | 98 |
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Delta | TX | Coupling Nut | Steel | Zinc/Clear | 5/16-18 | rod coupling nut zinc-econ 5/16-18 (7/16 AF X 7/8 LONG) | 2620 |
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Delta | TX | Coupling Nut | Steel | Zinc/Clear | 5/16-18 | rod coupling nut zinc 5/16-18 (5/8 AF X 1 3/4 LONG) | 100 |
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Delta | TX | Coupling Nut | Steel | Zinc/Clear | 5/16-18 | coupling nut zinc 5/16-18 (1/2 AF X 1 3/4 LONG) | 89 |
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B & K FAST | PA | Coupling Nut | Steel | Zinc/Clear | 5/16-18 x 7/8 | 5/16-18 x 7/8 short coupling nuts zinc b18.2.2 | 10 |
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B & K FAST | PA | Coupling Nut | Steel | Zinc/Clear | 5/16-18 x 1 1/8 | 5/16-18 x 1 1/8 hex coupling nuts zinc b18.2.2 | 451 |
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B & K FAST | PA | Coupling Nut | 300 Stainless (A1,A2, 18-8,304,310 etc.) | Plain | 5/16-18 x 1 | 5/16-18 x 1 stainless coupling nuts b18.2.2 | 29 |
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TSF | TX | Coupling Nut | 316, 317, A4 Stainless | Plain | 5/16-18 x 1 | hex coupling nut 316 ss 5/16-18 x 1 | 1 |
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Kanebridge | IL | Coupling Nut | Steel | Zinc/Clear | 5/16-18 x 7/8 | 5/16-18x7/8 hex rod coupling nut 7/16 across flats zinc | 5,000 |
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Kanebridge | IL | Coupling Nut | Steel | Zinc/Clear | 5/16-18 x 1 1/8 | 5/16-18x1 1/8 hex rod coupling nut 1/2 inch across flats zinc | 5,000 |
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Kanebridge | IL | Coupling Nut | Steel | Zinc/Clear | 5/16-18 x 7/8 | 5/16-18x7/8 hex rod coupling nut 1/2 inch across flats zinc | 5,000 |
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Kanebridge | IL | Coupling Nut | Steel | Zinc/Clear | 5/16-18 x 1 3/4 | 5/16-18x1 3/4 hex rod coupling nut 1/2 inch across flats zinc | 5,000 |
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Kanebridge | IL | Coupling Nut | 300 Stainless (A1,A2, 18-8,304,310 etc.) | Plain | 5/16-18 x 7/8 | 5/16-18x7/8 hex rod coupling nut 1/2 inch across flats 18-8 stainless steel | 4.375 |
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Kanebridge | IL | Coupling Nut | Grade 5 | Zinc/Clear | 5/16-18 x 1 1/8 | 5/16-18x1 1/8 hex rod coupling nut 1/2 inch across flats grade 5 zinc | 16.250 |
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QFC | TX | Coupling Nut | Steel | Zinc/Clear | 5/16-18 x 7/8 | 5/16-18 x 7/8 hex coupling nut zinc b18.2.2 | 1000 |
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Lippin | CA | Coupling Nut | Steel | Zinc/Clear | 5/16-18 x 1 1/8 | coupling nut zinc plated | 13389 |
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Lippin | CA | Coupling Nut | Steel | Zinc/Clear | 5/16-18 x 1/2 x 7/8 | coupling nut zinc plated | 1450 |
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Lippin | CA | Coupling Nut | Steel | Zinc/Clear | 5/16-18 x 1/4 | reducer coupling nut zinc plated | 200 |
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Lippin | CA | Coupling Nut | 300 Stainless (A1,A2, 18-8,304,310 etc.) | Plain | 5/16-18 | hex coupling nut stainless 18-8 | 50 |
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Lippin | CA | Coupling Nut | Steel | Zinc/Clear | 5/16-18 x 1 1/8 | 5/16-18 x 1 1/8 coup nut zn (1000) | 12800 |
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FastWare | Sask | Coupling Nut | Grade 2 | Zinc/Clear | 5/16-18 x 1/2 | afx1 nc coupling nut | 122 |
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SRF | AL | Coupling Nut | 300 Stainless (A1,A2, 18-8,304,310 etc.) | Plain | 5/16-18 x 1 | coupling nut s/s | 436 |
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SRF | AL | Coupling Nut | Steel | Zinc/Clear | 5/16-18 x 1 3/4 | coupling nut | 87 |
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SRF | AL | Coupling Nut | Steel | Zinc/Clear | 5/16-18 x 7/8 | coupling nut | 1,251 |
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BAYFASTCO | FL | Coupling Nut | Steel | Zinc/Clear | 5/16-18 x 1 1/8 | coupling nut | 2400 |
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THRDFAST | FL | Coupling Nut | Steel | Zinc/Clear | 5/16-18 x 1 3/4 | coupling nut b18.2.2 | 45 |
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THRDFAST | FL | Coupling Nut | Steel | Zinc/Clear | 5/16-18 | coupling nut b18.2.2 | 25 |
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GUIDON | NJ | Coupling Nut | Steel | Zinc/Clear | 5/16-18 x 7/8 | 1/2 hex | 850 |
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All Size | TX | Coupling Nut | Steel | Plain | 5/16-18 x 7/8 | 5/16-18 x 7/8 short coupling nut b18.2.2 | 16 |
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All Size | TX | Coupling Nut | Steel | Plain | 5/16-18 x 1 3/4 | 5/16-18 x 1-3/4 coupling nut heavy b18.2.2 | 86 |
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Valley Nu | WA | Coupling Nut | Steel | Zinc/Black | 5/16-18 x 1 3/4 | nc hex coupling nut zb | 118 |
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Valley Nu | WA | Coupling Nut | 300 Stainless (A1,A2, 18-8,304,310 etc.) | Plain | 5/16-18 | nc 18-8 ss coupling nut | 15 |
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