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5/16 Square Nuts
Square Nuts are just four-sided nuts, but compared to standard hex nuts, square nuts have a greater surface in contact with the part being fastened, and therefore provide greater resistance to loosening. Square nuts are typically mated with square-headed bolts.
122 results, (click on any line for more information)
| Buy Square Nuts from one of our FCH Network Members | ||||||||
|---|---|---|---|---|---|---|---|---|
| Supplier | Loc | Type | Material | Finish | Size | Description | Qty | |
| TSF | TX | Square Nut | Grade A | Plain | 5/16-18 | square heavy nut low carbon steel gr a plain 5/16-18 | 600 |
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| Jay-Cee | MI | Square Nut | Steel | Phosphate | 5/16-18 | 5/16-18 square machine screw nut black phos | 34590 |
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| Ababa | CA | Square Nut | 300 Stainless (A1,A2, 18-8,304,310 etc.) | Plain | 5/16-18 | 5/16-18 sq nut s/s b18.2.2 | 1684 |
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| Ababa | CA | Square Nut | Steel | Zinc/Clear | 5/16-18 | 5/16-18 sq nut stl znc b18.2.2 | 1200 |
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| Ababa | CA | Square Nut | Steel | Plain | 5/16-18 | 5/16-18 sq nut stl pln b18.2.2 | 600 |
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| YANKEE | NH | Square Nut | Steel | Plain | 5/16-18 | 5/16-18 square nut (9/16 wide) plain steel | 99 |
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| Weaver | WA | Square Nut | Steel | Plain | 5/16-18 | 5/16-18 square nut plain | 14434 |
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| Weaver | WA | Square Nut | 300 Stainless (A1,A2, 18-8,304,310 etc.) | Plain | 5/16-18 | 5/16-18 square nut 18-8 ss | 33 |
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| Weaver | WA | Square Nut | Steel | Zinc/Clear | 5/16-18 | 5/16-18 square nut zinc | 11679 |
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| ACCURATE | IL | Square Nut | Steel | Plain | 5/16-18 | square nut regular | 1200 |
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| OneMonroe | NC | Square Nut | 300 Stainless (A1,A2, 18-8,304,310 etc.) | Plain | 5/16-18 | 5/16-18 18-8 stainless steel square nut | 27 |
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| OneMonroe | NC | Square Nut | Steel | Plain | 5/16-18 | 5/16-18 plain finish square nut | 400 |
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| American | NY | Square Nut | Steel | Zinc/Clear | 5/16-18 | square nut zp | 8200 |
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| American | NY | Square Nut | Steel | Plain | 5/16-18 x 9/16 x 7/32 | square nut | 566 |
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| B & K FAST | PA | Square Nut | Steel | Plain | 5/16-18 | 5/16-18 square nuts plain b18.2.2 | 46832 |
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| B & K FAST | PA | Square Nut | Steel | Zinc/Clear | 5/16-18 | 5/16-18 square nuts zinc b18.2.2 | 6105 |
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| QFC | TX | Square Nut | Steel | Zinc/Clear | 5/16-18 | 5/16-18 square nut zinc b18.2.2 | 5430 |
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| WDMB | IA | Square Nut | Grade 2 | Zinc/Clear | 5/16-18 | nut sq grade 2 (zn) 5/16-18 (W000) | 1,000 |
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| MESAFAST | CA | Square Nut | Steel | Zinc/Clear | 5/16-18 | square nut | 97.0 |
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| ACF | CA | Square Nut | Steel | Plain | 5/16-18 | 5/16-18 square nut plain | 56 |
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| ACF | CA | Square Nut | Steel | Zinc/Clear | 5/16-18 | 5/16-18 square nut z/p (250 pak) | 150 |
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| ACF | CA | Square Nut | Steel | Zinc/Clear | 5/16-18 | 5/16-18 square nut z/p rohs | 70 |
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| SWACO | OH | Square Nut | Steel | Zinc/Clear | 5/16-18 | 5/16-18 sq nut stl zinc | 346 |
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| Wurth | Ont | Square Nut | Grade 2 | Zinc/Clear | 5/16-18 | nut sq gr2 (zn) 5/16-18 b18.2.2 | 151 |
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| Purchase | MO | Square Nut | Steel | Zinc/Clear | 5/16-18 | 5/16-18 square nut regular stl. zinc | 2500 |
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| Wurth Ada | MN | Square Nut | Grade 2 | Zinc/Yellow | 5/16-18 | nut sq grade 2 (zy) 5/16-18 | 1,900 |
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| Wurth Ada | MN | Square Nut | 300 Stainless (A1,A2, 18-8,304,310 etc.) | Plain | 5/16-18 | nut sq s/s (18 8) (pl) 5/16-18 | 333 |
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| Wurth Ada | MN | Square Nut | Grade 2 | Zinc/Clear | 5/16-18 | nut sq grade 2 (zn) 5/16-18 | 405 |
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| MFS | KS | Square Nut | Steel | Zinc/Clear | 5/16-18 | square nut | 2153 |
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| THRDFAST | FL | Square Nut | Steel | Zinc/Clear | 5/16-18 | square nut b18.2.2 | 1,286 |
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| American | NY | Square Nut | Steel | Phosphate | 5/16-18 x 1/2 | square nut parkerized NSQ-.31X.50PARKER | 144 |
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| THRDFAST | FL | Square Nut | Steel | Galvanized | 5/16-18 | square nut hdg b18.2.2 | 416 |
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| NAPPCO | TX | Square Nut | Steel | Zinc/Clear | 5/16-18 | 5/16-18 square nuts zp rohs | 1500 |
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| NAPPCO | TX | Square Nut | Steel | Zinc/Black | 5/16-18 | square nut steel black zinc 5/16-18 | 600 |
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| NAPPCO | TX | Square Nut | Steel | Plain | 5/16-18 | square nut steel 5/16-18 | 3460 |
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| BAYFASTCO | FL | Square Nut | Steel | Zinc/Clear | 5/16-18 | square nut | 20948 |
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| OBRIEN | OH | Square Nut | Steel | Zinc/Clear | 5/16-18 | square nut | 2500 |
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| OBRIEN | OH | Square Nut | 300 Stainless (A1,A2, 18-8,304,310 etc.) | Plain | 5/16-18 | regualr pattern square nut 18-8 304 | 188 |
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| Liberty | IL | Square Nut | Grade 5 | Zinc/Black | 5/16-18 | 5/16-18 regular square nut j995 grade 5 zinc black rohs | 550 |
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| IRF | NJ | Square Nut | Steel | Zinc/Yellow | 5/16-18 | machine sc square nut stlelw | 8351 |
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| IRF | NJ | Square Nut | Steel | Zinc/Clear | 5/16-18 | regular style square nut stl nickel & sealer | 1299 |
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| SeattleNB | WA | Square Nut | 300 Stainless (A1,A2, 18-8,304,310 etc.) | Plain | 5/16-18 | square nut 18-8 ss | 1,000 |
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| ISSCO | MO | Square Nut | Steel | Zinc/Black | 5/16-18 | square | 6700 |
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| ISSCO | MO | Square Nut | Steel | Zinc/Black | 5/16-18 | regular | 9850 |
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| Lippin | CA | Square Nut | Steel | Zinc/Clear | 5/16-18 | 5/16-18 square nut zinc | 4254 |
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| SRF | AL | Square Nut | 300 Stainless (A1,A2, 18-8,304,310 etc.) | Plain | 5/16-18 | square nut s/s | - |
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| GUIDON | NJ | Square Nut | Steel | Zinc/Yellow | 5/16-18 | machine screw pattern | 1,490 |
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| BoltCraft | NE | Square Nut | Steel | Zinc/Clear | 5/16-18 | 5/16-18 square nut zinc | inquire |
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| NutsBolts | NE | Square Nut | Steel | Zinc/Clear | 5/16-18 | 5/16-18 square nut zp | 340 |
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| BHAM | FL | Square Nut | Steel | Zinc/Clear | 5/16-18 | reg. square nuts zn | 1,158 |
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| Future Fastener | TX | Square Nut | 300 Stainless (A1,A2, 18-8,304,310 etc.) | Plain | 5/16-18 | 5/16-18 square nut ss | 22 |
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| Delta | TX | Square Nut | Steel | Zinc/Clear | 5/16-18 | fin square nut zinc 5/16-18 | 1535 |
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| Delta | TX | Square Nut | Steel | Plain | 5/16-18 | fin square nut plain 5/16-18 | 8493 |
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| Delta | TX | Square Nut | 300 Stainless (A1,A2, 18-8,304,310 etc.) | Plain | 5/16-18 | fin square nut 18-8 sst 5/16-18 | 56 |
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| FMP | MA | Square Nut | Steel | Zinc/Clear | 5/16-18 | square m/s nut | 1150 |
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| FMP | MA | Square Nut | Steel | Plain | 5/16-18 | square m/s nut | 16300 |
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| FMP | MA | Square Nut | Brass | Plain | 5/16-18 | square m/s nut | 500 |
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| BHAM | AL | Square Nut | Steel | Zinc/Clear | 5/16-18 | 5/16-18 reg. square nuts zn | 330 |
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| Komar | IL | Square Nut | Steel | Zinc/Clear | 5/16-18 | 5/16-18 reg square nut(9/16x17/64) zinc | 1500 |
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| FastWare | Sask | Square Nut | Grade 2 | Plain | 5/16-18 | nc square nut | 15 |
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| Alma Bolt | MI | Square Nut | Steel | Plain | 5/16-18 | square nut | 168 |
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| MAINSOURC | NH | Square Nut | Steel | Plain | 5/16-18 | square nut stl | 600 |
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| MAINSOURC | NH | Square Nut | Steel | Plain | 5/16-18 | square nut stl z/clr | 1427 |
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| MTP | CA | Square Nut | 300 Stainless (A1,A2, 18-8,304,310 etc.) | Plain | 5/16-18 | 5/16-18 s.s square nuts | 500 |
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| Kanebridge | IL | Square Nut | Steel | Zinc/Clear | 5/16-18 | 5/16-18 regular square nut zinc | 25,000 |
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| Liberty | IL | Square Nut | Steel | Zinc/Clear | 5/16-18 | regular square nut zinc | 1,845 |
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| Liberty | IL | Square Nut | Steel | Zinc/Yellow | 5/16-18 | regular square nut & & | 1,000 |
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| HBBOLT | CA | Square Nut | Steel | Zinc/Clear | 5/16-18 | square nut | 1,372 |
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| IPC | VA | Square Nut | Steel | Zinc/Clear | 5/16-18 | 5/16-18 square nut steel cr3 zinc-rohs rohs compliant | 1,396 |
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| XL Screw | GA | Square Nut | Steel | Zinc/Clear | 5/16-18 | regular square nuts zp | 2,500 |
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| XL Screw | GA | Square Nut | Steel | Plain | 5/16-18 | regular square nuts | 2,500 |
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| A-Plus Co | OR | Square Nut | Plain | 5/16-18 | 5/16-18 sq nut nc | 194 |
| |
| Endries | WI | Square Nut | Steel | Zinc/Clear | 5/16-18 square nut hex chromium free 96 hr salt spray zinc | 594 |
| |
| ACCURATE | IL | Square Nut | Steel | Zinc/Clear | 5/16-18 | 5/16-18 mch sc square nuts | 13,000 |
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| Kanebridge | IL | Square Nut | Steel | Galvanized | 5/16-18 | 5/16-18 square nut regular galvanized | 10,000 |
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| Hayes | CA | Square Nut | Steel | Plain | 5/16-18 | 5/16-18 square nut pln | 47 |
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| Hayes | CA | Square Nut | Steel | Zinc/Clear | 5/16-18 | 5/16-18 square nut zinc | 63 |
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| Wurth Ind | D.F. | Square Nut | Steel | Zinc/Clear | 5/16-18 | 5/16-18 square nut zn | - |
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| Endries | WI | Square Nut | Steel | Zinc/Clear | 5/16-18 | 5/16-18 square nut trivalent clear zinc | 1050 |
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| OSSCO | RI | Square Nut | Steel | Plain | 5/16-18 | 5/16-18 square nut b18.2.2 | 4,567 |
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| Mansco | MI | Square Nut | Steel | Zinc/Black | 5/16-18 | 5/16-18 reg square nut blk znc .562 a/f .250 thk | 1500 |
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| BHAM | AL | Square Nut | 300 Stainless (A1,A2, 18-8,304,310 etc.) | Plain | 5/16-18 | 5/16-18 sq nut 300 ser ss b18.2.2 | 15 |
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| Brikksen | FL | Square Nut | 316, 317, A4 Stainless | Plain | 5/16-18 | 5/16-18 square finish nut 316 ss | inquire |
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| Brikksen | FL | Square Nut | 316, 317, A4 Stainless | Plain | 5/16-18 | 5/16-18 square finish nut 316 ss | inquire |
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| Brikksen | FL | Square Nut | 316, 317, A4 Stainless | Plain | 5/16-18 | 5/16-18 square finish nut 316 ss | 16000 |
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| Alma Bolt | MI | Square Nut | Grade 5 | Plain | 5/16-18 | 5/16-18 grade 5 | square nut | 76 |
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| Brikksen | FL | Square Nut | 300 Stainless (A1,A2, 18-8,304,310 etc.) | Plain | 5/16-18 | 5/16-18 square ms nut ss 7/32 hgt | inquire |
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| Brikksen | FL | Square Nut | 300 Stainless (A1,A2, 18-8,304,310 etc.) | Plain | 5/16-18 | 5/16-18 square ms nut ss 7/32 hgt | inquire |
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| GLF | OH | Square Nut | Steel | Plain | 5/16-18 | 5/16-18 sq nut stl pln | 1300 |
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| OneMonroe | MA | Square Nut | Steel | Plain | 5/16-18 | 5/16-18 plain finish square nut | 400 |
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| Brikksen | FL | Square Nut | 316, 317, A4 Stainless | Plain | 5/16-18 | 5/16-18 square finish nut 316 ss | inquire |
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| Brikksen | FL | Square Nut | 316, 317, A4 Stainless | Plain | 5/16-18 | 5/16-18 square finish nut 316 ss | 2000 |
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| Brikksen | FL | Square Nut | 300 Stainless (A1,A2, 18-8,304,310 etc.) | Plain | 5/16-18 | 5/16-18 square ms nut ss 7/32 hgt | inquire |
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| Brikksen | FL | Square Nut | 316, 317, A4 Stainless | Plain | 5/16-18 | 5/16-18 square finish nut 316 ss | inquire |
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| Brikksen | FL | Square Nut | 300 Stainless (A1,A2, 18-8,304,310 etc.) | Plain | 5/16-18 | 5/16-18 square ms nut ss 7/32 hgt | inquire |
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| Accutite | CA | Square Nut | 300 Stainless (A1,A2, 18-8,304,310 etc.) | Plain | 5/16-18 | 5/16-18 reg. sq nut stainless steel 18-8 thickness .225 max | 8200 |
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| AFI | FL | Square Nut | Steel | Zinc/Clear | 5/16-18 | 5/16-18 square nut st zn () () | 1200 |
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| Valley Nu | WA | Square Nut | Steel | Zinc/Black | 5/16-18 | nc regular square nut zb | 190 |
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| Brikksen | FL | Square Nut | 300 Stainless (A1,A2, 18-8,304,310 etc.) | Plain | 5/16-18 | 5/16-18 square ms nut ss 7/32 hgt | inquire |
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| Raw Produ | NJ | Square Nut | Steel | Zinc/Clear | 5/16-18 | square nuts zinc 5/16-18 | 2036 |
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| Brikksen | FL | Square Nut | 300 Stainless (A1,A2, 18-8,304,310 etc.) | Plain | 5/16-18 | 5/16-18 square ms nut ss 7/32 hgt | inquire |
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| Brikksen | FL | Square Nut | 300 Stainless (A1,A2, 18-8,304,310 etc.) | Plain | 5/16-18 | 5/16-18 square ms nut ss 7/32 hgt | 18000 |
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| Brikksen | FL | Square Nut | 316, 317, A4 Stainless | Plain | 5/16-18 | 5/16-18 square finish nut 316 ss | 7000 |
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| Empire | WA | Square Nut | Steel | Zinc/Clear | 5/16-18 | 5/16-18 nc reg square nut zp | 2300 |
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| Brikksen | FL | Square Nut | 300 Stainless (A1,A2, 18-8,304,310 etc.) | Plain | 5/16-18 | 5/16-18 square ms nut ss 7/32 hgt | inquire |
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| THRDFAST | AL | Square Nut | 300 Stainless (A1,A2, 18-8,304,310 etc.) | Plain | 5/16-18 | 18-8 ss square nut b18.2.2 | 14 |
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| Raw Produ | NJ | Square Nut | 300 Stainless (A1,A2, 18-8,304,310 etc.) | Plain | 5/16-18 | square nuts 304 ss 5/16-18 | 960 |
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| SWACO | OH | Square Nut | Steel | Plain | 5/16-18 | 5/16-18 4-projections short pilot square weld nuts c1010 steel plain | 1556 |
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| Century | FL | Square Nut | Steel | Plain | 5/16-18 | 5/16-18 reg square nut q2b steel | 2500 |
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| Raw Produ | NJ | Square Nut | Grade 2 | Galvanized | 5/16-18 | square nuts hdg grade 2-5/16-18 | 2567 |
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| GLF | OH | Square Nut | Steel | Zinc/Clear | 5/16-18 | 5/16-18 sq nut stl zc | 850 |
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| Olander | CA | Square Nut | 300 Stainless (A1,A2, 18-8,304,310 etc.) | Plain | 5/16-18 | 5/16-18 sq nut sst rohs () | 3500 |
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| Raw Produ | NJ | Square Nut | 316, 317, A4 Stainless | Plain | 5/16-18 | square nuts 316 ss 5/16-18 | 383 |
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| Wurth Ind | IN | Square Nut | 300 Stainless (A1,A2, 18-8,304,310 etc.) | Plain | 5/16-18 | regular square nut 5/16-18 300 stainless (a1,a2, 18-8,304,310 etc.) plain | 9985 |
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| Brikksen | FL | Square Nut | 316, 317, A4 Stainless | Plain | 5/16-18 | 5/16-18 square finish nut 316 ss | inquire |
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| Raw Produ | NJ | Square Nut | 300 Stainless (A1,A2, 18-8,304,310 etc.) | Plain | 5/16-24 | square nuts 304 ss 5/16-24 | 44 |
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| Jackson | MS | Square Nut | Steel | Zinc/Clear | 5/16 | nc square nut | 6639 |
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| QFC | TX | Square Nut | Steel | Plain | 5/16 | 5/16nc plain square nut 321032 b18.2.2 | 152 |
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| ACF | CA | Square Nut | Grade 5 | Zinc/Clear | 5/16-18 9/16 x 17/64 | 5/16-18 gr5 square nut 9/16x17/64 z/p rohs | 1000 |
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| Jackson | MS | Square Nut | 300 Stainless (A1,A2, 18-8,304,310 etc.) | Plain | 5/16 | nc 18-8 304 square nut | 177 |
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| QFC | TX | Square Nut | 300 Stainless (A1,A2, 18-8,304,310 etc.) | Plain | 5/16 | 5/16nc square nut st/st b18.2.2 | 60 |
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| QFC | TX | Square Nut | Steel | Zinc/Clear | 5/16 | 5/16nc bzp square nut b18.2.2 | 150 |
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