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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.
98 results, (click on any line for more information)
| Search Results Sponsored by American Imperial Screw, your source for Coupling Nuts. For more results, visit www.discountscrews.com | ||||||||
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| Supplier | Loc | Type | Material | Finish | Size | Description | Qty | |
| Buy Hex Coupling Nuts from one of our FCH Network Members | ||||||||
| 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 | 79 |
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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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| QCS | OR | Coupling Nut | Steel | Plain | 5/16-18 x 7/16 x 7/8 | 5/16-18 x 7/16 x 7/8 econo rod coupling nut plain | 300 |
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| UNEEDA | NJ | Coupling Nut | Steel | Plain | 5/16-18 | coupling nut | 274 |
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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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| 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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| ACF | CA | Coupling Nut | Steel | Zinc/Clear | 5/16-18 | 5/16-18 economy rod coupling nut z/p rohs compliant | 75729 |
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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 | 400 |
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| METRO IND | OH | Coupling Nut | Steel | Zinc/Clear | 5/16-18 | coupling nut uss | 970 |
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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 | 23 |
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| NutsBolts | NE | Coupling Nut | Steel | Zinc/Clear | 5/16-18 | 5/16-18 s coupling nut zp | 546 |
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| NutsBolts | NE | Coupling Nut | Steel | Zinc/Clear | 5/16-18 | 5/16-18 l coupling nut zp | 49 |
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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 | 200 |
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| ACCURATE | IL | Coupling Nut | Steel | Zinc/Clear | 5/16-18 x 1 1/8 | hex coupling nut | 458 |
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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 | 6 |
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| ASMC | IL | Coupling Nut | Grade A | Zinc/Clear | 5/16-18 x 7/16 x 7/8 | 5/16-18xw7/16xl7/8 coarse a563 gra hex rod coupling nut low carb zp | 281 |
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| ASMC | IL | Coupling Nut | Grade A | Galvanized | 5/16-18 x 1/2 | 5/16-18xw1/2xl1 3/4 coarse a563 gra hex rod coupling nut low carb hdg b18.2.2 | 159 |
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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 | 41 |
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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 | 456 |
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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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| 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 | 1700 |
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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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| 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 | 1460 |
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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 | 300 |
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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 | 40 |
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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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| 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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| 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 | 1,000 |
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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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| CNB | IL | Coupling Nut | Grade 2 | Zinc/Clear | 5/16-18 | coupling nut gr.2 plate | 22 |
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| EBN Indus | IN | Coupling Nut | Steel | Zinc/Clear | 5/16-18 x 1 | 5/16-18 x 1 reducing coup nut 3/8-16 zinc b18.2.2 | 33 |
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| ACF | CA | Coupling Nut | Steel | Zinc/Clear | 5/16-18 | 5/16-18 rod coupling nut z/p rohs | 450 |
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| Certified | IL | Coupling Nut | Steel | Plain | 5/16-18 x 7/8 | 5/16-18 x 7/8 hex coupling nut-zps. b18.2.2 | 1,500 |
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| Certified | IL | Coupling Nut | Steel | Plain | 5/16-18 x 1 | 5/16-18 x 1 hex coupling nut-zps. b18.2.2 | 200 |
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| Certified | IL | Coupling Nut | Steel | Plain | 5/16-18 x 1 3/4 | 5/16-18 x 1-3/4 hex coupling nut plain b18.2.2 | 500 |
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| Certified | IL | Coupling Nut | Steel | Plain | 5/16-18 x 1 3/4 | 5/16-18 x 1-3/4 hex coupling nut-zps. b18.2.2 | 1,637 |
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| Certified | IL | Coupling Nut | Steel | Plain | 5/16-18 x 1 1/8 | 5/16-18 x 1-1/8 short hex coupling nut-zps. b18.2.2 | 74 |
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| Delta | TX | Coupling Nut | Steel | Zinc/Clear | 5/16-18 | rod coupling nut zinc-econ 5/16-18 | 2620 |
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| Delta | TX | Coupling Nut | Steel | Zinc/Clear | 5/16-18 | rod coupling nut zinc 5/16-18 | 208 |
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| Delta | TX | Coupling Nut | Steel | Zinc/Clear | 5/16-18 | coupling nut zinc 5/16-18 | 89 |
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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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| RCFast | AZ | Coupling Nut | Grade 5 | Zinc/Clear | 5/16-18 x 2 | hex gr5 coupling nut stl (1/2 hex) | inquire |
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| RCFast | AZ | Coupling Nut | Grade A | Zinc/Clear | 5/16-18 | hex coupling nut a563 gra cr+3 (7/16x7/8 economy) | inquire |
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| RCFast | AZ | Coupling Nut | Grade A | Zinc/Clear | 5/16-18 | hex coupling nut a563 gra cr+3 (1/2x1 3/4 regular) | inquire |
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| RCFast | AZ | Coupling Nut | Grade A | Zinc/Clear | 5/16-18 | hex coupling nut a563 gra cr+3 (1/2x1 1/8 economy) | inquire |
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| RCFast | AZ | Coupling Nut | Grade A | Zinc/Clear | 5/16-18 | hex coupling nut a563 gra cr+3 (5/8x1 3/4 economy) | inquire |
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| RCFast | AZ | Coupling Nut | Grade A | Zinc/Clear | 5/16-18 | hex coupling nut a563 gra cr+3 (1/2x1 economy) | inquire |
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| RCFast | AZ | Coupling Nut | Grade A | Zinc/Clear | 5/16-18 | hex coupling nut a563 gra cr+3 (7/16x7/8 economy) | inquire |
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| RCFast | AZ | Coupling Nut | Grade A | Plain | 5/16-18 | hex coupling nut a563 gra (1/2x1 3/4) | inquire |
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| RCFast | AZ | Coupling Nut | Steel | Galvanized | 5/16-18 | hex coupling nut a563 hdg (1/2x1 3/4) | inquire |
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| Standard | MA | Coupling Nut | 300 Stainless (A1,A2, 18-8,304,310 etc.) | Plain | 5/16-18 | 5/16-18 coupling nut 18-8 stainless steel b18.2.2 | inquire |
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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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| 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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| 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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| 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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| Northern | MN | Coupling Nut | Steel | Black Oxide | 5/16-18 | nc coupler nut black rie4037a | 349 |
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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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| AFI | FL | Coupling Nut | Steel | Zinc/Clear | 5/16-18 x 1 1/2 | 5/16-18x1-1/8-1/2 hex coupling nut st zn | 600 |
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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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| GLF | OH | Coupling Nut | Steel | Zinc/Clear | 5/16-18 x 1 3/4 x 5/8 | waf hex coupling nut zc nut | 98 |
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| GLF | OH | Coupling Nut | Steel | Zinc/Clear | 5/16-18 x 1 3/4 x 1/2 | waf hex coupling nut zc nut | 402 |
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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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| Komar | MO | Coupling Nut | Steel | Zinc/Clear | 5/16-18 x 1 1/8 | lg. coupling nut | 50 |
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| Komar | MO | Coupling Nut | Steel | Zinc/Clear | 5/16-18 x 1 | lg. coupling nut 1/2 dia | 2800 |
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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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| Timberline | CO | Coupling Nut | Steel | Zinc/Clear | 5/16-18 x 1 3/4 | rod cpl nut zn 5/16-18 x 1-3/4 | 620 |
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| Timberline | CO | Coupling Nut | Steel | Zinc/Clear | 5/16-18 x 1 3/4 | rod cpl nut zn 5/16-18 x 1-3/4 | 2 |
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| Timberline | CO | Coupling Nut | Steel | Zinc/Clear | 5/16-18 x 1 3/4 | rod cpl nut zn 5/16-18 x 1-3/4 | 286 |
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| Alma Bolt | MI | Coupling Nut | Steel | Plain | 5/16-18 | heavy(5/8 afx1 3/4) coupling nut | 2056 |
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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 | 1413 |
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| Alma Bolt | MI | Coupling Nut | Steel | Zinc/Clear | 5/16-18 | (5/8afx1 3/4lg) coupling nut | 300 |
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