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5/8 Square Head Bolts (ASME B18. 2.1)
Square Head Bolts were once the most common form of bolt, until they were replaced by hex head bolts. They are covered under ANSI Standard B18.2.1 and are now most commonly used for aesthetic purposes to provide a rustic look .
116 results, (click on any line for more information)
| Buy Square Head Bolts from one of our FCH Network Members | ||||||||
|---|---|---|---|---|---|---|---|---|
| Supplier | Loc | Type | Material | Finish | Size | Description | Qty | |
| Ababa | CA | Square Head Bolt | Steel | Zinc/Clear | 5/8-11 x 2 | 5/8-11 x 2 sq hd blt steel znc b18.2.1 | 6 |
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| Ababa | CA | Square Head Bolt | Steel | Zinc/Clear | 5/8-11 x 2 1/2 | 5/8-11 x 2 1/2 sq hd blt steel znc b18.2.1 | 156 |
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| ASMC | IL | Square Head Bolt | Grade A | Galvanized | 5/8-11 x 3 | a307 gra square hd m/b low carb hdg b18.2.1 | 18 |
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| ASMC | IL | Square Head Bolt | Grade A | Plain | 5/8-11 x 7 | (pt) coarse a307 gra square hd m/b low carb b18.2.1 | 50 |
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| BIG BOLT | IL | Square Head Bolt | Grade 5 | Plain | 5/8-11 x 12 | bolt & c/s square boltsquare b18.2.1 | 700 |
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| BIG BOLT | IL | Square Head Bolt | Grade 8 | Plain | 5/8-11 x 12 | bolt & c/s square boltsquare b18.2.1 | 1000 |
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| BIG BOLT | IL | Square Head Bolt | Grade 5 | Plain | 5/8-11 x 4 1/2 | bolt & c/s square boltsquare b18.2.1 | 3316 |
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| BIG BOLT | IL | Square Head Bolt | Grade 5 | Plain | 5/8-11 x 3 1/2 | bolt & c/s square boltsquare b18.2.1 | 1318 |
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| BIG BOLT | IL | Square Head Bolt | Grade 8 | Plain | 5/8-11 x 14 | bolt & c/s square boltsquare b18.2.1 | 1000 |
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| BIG BOLT | IL | Square Head Bolt | Grade 5 | Plain | 5/8-11 x 7 | bolt & c/s square boltsquare b18.2.1 | 1382 |
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| BIG BOLT | IL | Square Head Bolt | Steel | Plain | 5/8-11 x 3 | bolt & c/s square bolt5/8-11x3square 2.5thd b18.2.1 | 8100 |
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| BIG BOLT | IL | Square Head Bolt | Grade 8 | Plain | 5/8-11 x 6 | bolt & c/s square boltsquare b18.2.1 | 200 |
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| BIG BOLT | IL | Square Head Bolt | Grade 8 | Plain | 5/8-11 x 8 | bolt & c/s square boltsquare b18.2.1 | 400 |
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| BIG BOLT | IL | Square Head Bolt | Grade 5 | Plain | 5/8-11 x 16 | bolt & c/s square boltsquare b18.2.1 | 500 |
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| BIG BOLT | IL | Square Head Bolt | Grade 5 | Plain | 5/8-11 x 5 | bolt & c/s square boltsquare b18.2.1 | 2100 |
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| BIG BOLT | IL | Square Head Bolt | Grade 5 | Plain | 5/8-11 x 3 | bolt & c/s square boltsquare b18.2.1 | 3000 |
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| BIG BOLT | IL | Square Head Bolt | 300 Stainless (A1,A2, 18-8,304,310 etc.) | Plain | 5/8-11 x 3 | bolt & c/s square bolt300 (a1 a2 18-8 304 310 etc.)square b18.2.1 | 500 |
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| BIG BOLT | IL | Square Head Bolt | Grade 5 | Plain | 5/8-11 x 14 | bolt & c/s square boltsquare b18.2.1 | 500 |
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| BIG BOLT | IL | Square Head Bolt | Grade 5 | Plain | 5/8-11 x 4 | bolt & c/s square boltsquare b18.2.1 | 1381 |
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| BIG BOLT | IL | Square Head Bolt | Grade 5 | Plain | 5/8-11 x 1 1/2 | bolt & c/s square boltsquare b18.2.1 | 15000 |
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| BIG BOLT | IL | Square Head Bolt | 300 Stainless (A1,A2, 18-8,304,310 etc.) | Plain | 5/8-11 x 2 1/2 | bolt & c/s square bolt300 (a1 a2 18-8 304 310 etc.)square b18.2.1 | 500 |
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| BIG BOLT | IL | Square Head Bolt | Steel | Plain | 5/8-11 x 1 | bolt & c/s square boltsquare b18.2.1 | 525 |
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| BIG BOLT | IL | Square Head Bolt | 300 Stainless (A1,A2, 18-8,304,310 etc.) | Plain | 5/8-18 x 10 | bolt & c/s square bolt300 (a1 a2 18-8 304 310 etc.)b18.2.1 | 500 |
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| BIG BOLT | IL | Square Head Bolt | 300 Stainless (A1,A2, 18-8,304,310 etc.) | Plain | 5/8-11 x 3 1/2 | bolt & c/s square bolt300 (a1 a2 18-8 304 310 etc.)square b18.2.1 | 500 |
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| JET FITTING | CA | Square Head Bolt | Grade A | Plain | 5/8-11 x 2 | 5/8-11x2 a307 gr a square hd bolt pln 747242 b18.2.1 | 25 |
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| JET FITTING | CA | Square Head Bolt | Grade A | Plain | 5/8-11 x 3 1/2 | 5/8-11x3 1/2 a307 gr a square hd bolt p 747248 b18.2.1 | 82 |
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| JET FITTING | CA | Square Head Bolt | Grade A | Plain | 5/8-11 x 2 1/2 | 5/8-11x2 1/2 a307 gr a square hd bolt p 747244 b18.2.1 | 50 |
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| QFC | TX | Square Head Bolt | Grade A | Galvanized | 5/8-11 x 31 | 5/8-11x31 square head bolt a307 hdg 6 thd b18.2.1 | 2 |
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| QFC | TX | Square Head Bolt | Grade A | Galvanized | 5/8-11 x 33 | 5/8-11x33 square head bolt a307 hdg 6 thd b18.2.1 | 3 |
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| QFC | TX | Square Head Bolt | Grade A | Galvanized | 5/8-11 x 34 | 5/8-11x34 square head bolt a307 hdg 6 thd b18.2.1 | 3 |
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| QFC | TX | Square Head Bolt | Grade A | Galvanized | 5/8-11 x 37 | 5/8-11x37 square head bolt a307 hdg 6 thd b18.2.1 | 3 |
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| QFC | TX | Square Head Bolt | Grade A | Galvanized | 5/8-11 x 38 | 5/8-11x38 square head bolt a307 hdg 6 thd b18.2.1 | 2 |
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| QFC | TX | Square Head Bolt | Grade A | Galvanized | 5/8-11 x 55 | 5/8-11x55 square head bolt a307 hdg 6 thd b18.2.1 | 2 |
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| QFC | TX | Square Head Bolt | Grade A | Galvanized | 5/8-11 x 56 | 5/8-11x56 square head bolt a307 hdg 6 thd b18.2.1 | 2 |
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| QFC | TX | Square Head Bolt | Grade A | Galvanized | 5/8-11 x 58 | 5/8-11x58 square head bolt a307 hdg 6 thd b18.2.1 | 2 |
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| QFC | TX | Square Head Bolt | Grade A | Galvanized | 5/8-11 x 63 | 5/8-11x63 square head bolt a307 hdg 6 thd b18.2.1 | 2 |
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| QFC | TX | Square Head Bolt | Grade A | Galvanized | 5/8-11 x 14 | 5/8-11x14 square hd bolt a307 hdg b18.2.1 | 20 |
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| Cascade | OR | Square Head Bolt | Steel | Plain | 5/8-11 x 7 | square m/b b18.2.1 | 13 |
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| Cascade | OR | Square Head Bolt | Steel | Plain | 5/8-11 x 8 | square m/b b18.2.1 | 24 |
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| B & K FAST | PA | Square Head Bolt | Steel | Galvanized | 5/8-11 x 4 | 5/8-11 x 4 galv square bolts b18.2.1 | 581 |
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| B & K FAST | PA | Square Head Bolt | Steel | Galvanized | 5/8-11 x 4 1/2 | 5/8-11 x 4 1/2 galv square bolts b18.2.1 | 23 |
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| B & K FAST | PA | Square Head Bolt | Steel | Plain | 5/8-11 x 1 1/4 | 5/8-11 x 1 1/4 square bolts plain b18.2.1 | 1852 |
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| B & K FAST | PA | Square Head Bolt | Steel | Plain | 5/8-11 x 3 1/2 | 5/8-11 x 3 1/2 square bolts plain b18.2.1 | 323 |
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| B & K FAST | PA | Square Head Bolt | Grade 5 | Plain | 5/8-11 x 5 | 5/8-11 x 5 square bolts gr 5 plain b18.2.1 | 10 |
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| B & K FAST | PA | Square Head Bolt | Steel | Plain | 5/8-11 x 5 | 5/8-11 x 5 square bolts plain b18.2.1 | 119 |
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| B & K FAST | PA | Square Head Bolt | Grade 8 | Plain | 5/8-11 x 5 1/2 | 5/8-11 x 5 1/2 square bolts gr 8 plain b18.2.1 | 7 |
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| B & K FAST | PA | Square Head Bolt | Steel | Plain | 5/8-11 x 6 | 5/8-11 x 6 square bolts plain b18.2.1 | 3 |
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| B & K FAST | PA | Square Head Bolt | Grade 5 | Plain | 5/8-11 x 6 1/2 | 5/8-11 x 6 1/2 square bolts full thread gr 5 plain b18.2.1 | 1 |
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| B & K FAST | PA | Square Head Bolt | Steel | Plain | 5/8-11 x 6 1/2 | 5/8-11 x 6 1/2 square bolts plain b18.2.1 | 600 |
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| B & K FAST | PA | Square Head Bolt | Steel | Plain | 5/8-11 x 7 1/2 | 5/8-11 x 7 1/2 square bolts plain b18.2.1 | 6 |
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| B & K FAST | PA | Square Head Bolt | Steel | Plain | 5/8-11 x 8 | 5/8-11 x 8 square bolts plain b18.2.1 | 154 |
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| B & K FAST | PA | Square Head Bolt | Steel | Plain | 5/8-11 x 8 1/2 | 5/8-11 x 8 1/2 square bolts plain b18.2.1 | 206 |
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| B & K FAST | PA | Square Head Bolt | Steel | Plain | 5/8-11 x 2 1/4 | 5/8-11 x 2 1/4 square bolts plain b18.2.1 | 1477 |
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| B & K FAST | PA | Square Head Bolt | Steel | Plain | 5/8-11 x 9 | 5/8-11 x 9 square bolts plain b18.2.1 | 10 |
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| B & K FAST | PA | Square Head Bolt | Steel | Plain | 5/8-11 x 3 | 5/8-11 x 3 square bolts plain b18.2.1 | 11 |
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| General F | MI | Square Head Bolt | Grade 8 | Plain | 5/8-18 x 2 1/4 | 5/8-18x2.25 square hd stop bolt gr8 b18.2.1 | 24,272 |
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| General F | MI | Square Head Bolt | Steel | Zinc/Clear | 5/8-11 x 2 1/2 | 5/8-11 x 2.5 sq hd bolt zinc b18.2.1 | 100 |
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| OSSCO | RI | Square Head Bolt | Steel | Plain | 5/8-11 x 1 1/4 | 5/8-11x1 1/4 square hd mach bolt b18.2.1 | 59 |
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| OSSCO | RI | Square Head Bolt | Steel | Plain | 5/8-11 x 2 | 5/8-11x2 square hd mach bolt b18.2.1 | 24 |
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| QFC | TX | Square Head Bolt | Grade A | Galvanized | 5/8-11 x 22 | 5/8-11 x 22 square head bolt a307 hdg 6 thd b18.2.1 | 3 |
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| QFC | TX | Square Head Bolt | Grade A | Galvanized | 5/8-11 x 21 | 5/8-11 x 21 square head bolt a307 hdg 6 thd b18.2.1 | 3 |
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| QFC | TX | Square Head Bolt | Grade A | Galvanized | 5/8-11 x 24 | 5/8-11 x 24 square head bolt a307 hdg 6 thd b18.2.1 | 4 |
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| QFC | TX | Square Head Bolt | Grade A | Galvanized | 5/8-11 x 23 | 5/8-11 x 23 square head bolt a307 hdg 6 thd b18.2.1 | 6 |
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| QFC | TX | Square Head Bolt | Grade A | Galvanized | 5/8-11 x 25 | 5/8-11 x 25 square head bolt a307 hdg 6 thd b18.2.1 | 2 |
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| QFC | TX | Square Head Bolt | Grade A | Galvanized | 5/8-11 x 27 | 5/8-11 x 27 square head bolt a307 hdg 6 thd b18.2.1 | 1 |
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| QFC | TX | Square Head Bolt | Grade A | Galvanized | 5/8-11 x 26 | 5/8-11 x 26 square head bolt a307 hdg 6 thd b18.2.1 | 3 |
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| QFC | TX | Square Head Bolt | Grade A | Galvanized | 5/8-11 x 32 | 5/8-11 x 32 square head bolt a307 hdg 6 thd b18.2.1 | 4 |
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| QFC | TX | Square Head Bolt | Grade A | Galvanized | 5/8-11 x 30 | 5/8-11 x 30 square head bolt a307 hdg 6 thd b18.2.1 | 1 |
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| QFC | TX | Square Head Bolt | Grade A | Galvanized | 5/8-11 x 35 | 5/8-11 x 35 square head bolt a307 hdg 6 thd b18.2.1 | 4 |
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| QFC | TX | Square Head Bolt | Grade A | Galvanized | 5/8-11 x 41 | 5/8-11 x 41 square head bolt a307 hdg 6 thd b18.2.1 | 5 |
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| QFC | TX | Square Head Bolt | Grade A | Galvanized | 5/8-11 x 39 | 5/8-11 x 39 square head bolt a307 hdg 6 thd b18.2.1 | 6 |
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| QFC | TX | Square Head Bolt | Grade A | Galvanized | 5/8-11 x 36 | 5/8-11 x 36 square head bolt a307 hdg 6 thd b18.2.1 | 1 |
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| Bostwick | IN | Square Head Bolt | Grade 5 | Plain | 5/8-11 x 2 | 5/8-11 x 2 square hd bolt gr 5 b18.2.1 | 12 |
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| Bostwick | IN | Square Head Bolt | Grade 5 | Plain | 5/8-11 x 1 1/2 | 5/8-11 x 1 1/2 square hd bolt gr 5 b18.2.1 | 9 |
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| JET FITTING | CA | Square Head Bolt | Grade A | Plain | 5/8-11 x 3 1/2 | 5/8-11x3-1/2 (pt) square bolt steel a307 plain b18.2.1 | 95 |
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| THRDFAST | FL | Square Head Bolt | Steel | Galvanized | 5/8-11 x 1 | square hd bolt hdg b18.2.1 | 291 |
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| THRDFAST | FL | Square Head Bolt | Steel | Galvanized | 5/8-11 x 2 1/2 | square hd bolt hdg b18.2.1 | 100 |
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| THRDFAST | FL | Square Head Bolt | Steel | Galvanized | 5/8-11 x 16 1/2 | square hd bolt hdg b18.2.1 | 47 |
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| THRDFAST | FL | Square Head Bolt | Steel | Plain | 5/8-11 x 18 | a-bolt w/nut & sq washer b18.2.1 | 5 |
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| THRDFAST | FL | Square Head Bolt | Steel | Plain | 5/8-11 x 3 | square hd bolt b18.2.1 | 3 |
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| THRDFAST | OK | Square Head Bolt | Steel | Galvanized | 5/8-11 x 4 | square hd bolt hdg b18.2.1 | 117 |
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| THRDFAST | OK | Square Head Bolt | Steel | Galvanized | 5/8-11 x 3 | square hd bolt hdg full thread b18.2.1 | 7 |
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| THRDFAST | OK | Square Head Bolt | Steel | Galvanized | 5/8-11 x 16 | square hd bolt hdg b18.2.1 | 2 |
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| THRDFAST | TN | Square Head Bolt | Grade B8M | Plain | 5/8-11 x 1 3/4 | a193 b8m sq bolt b18.2.1 | 5 |
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| THRDFAST | AL | Square Head Bolt | Steel | Galvanized | 5/8-11 x 8 | square hd bolt hdg b18.2.1 | 594 |
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| THRDFAST | AL | Square Head Bolt | Steel | Galvanized | 5/8-11 x 4 1/2 | square hd bolt hdg b18.2.1 | 98 |
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| THRDFAST | AL | Square Head Bolt | Steel | Galvanized | 5/8-11 x 2 1/2 | square hd bolt hdg b18.2.1 | 29 |
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| THRDFAST | AL | Square Head Bolt | Steel | Galvanized | 5/8-11 x 12 | square hd bolt rt6 hdg b18.2.1 | stock |
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| THRDFAST | AL | Square Head Bolt | Steel | Galvanized | 5/8-11 x 1 1/2 | square hd bolt hdg b18.2.1 | 10 |
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| THRDFAST | AL | Square Head Bolt | Steel | Galvanized | 5/8-11 x 22 | square hd bolt hdg b18.2.1 | 7 |
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| THRDFAST | AL | Square Head Bolt | Steel | Galvanized | 5/8-11 x 8 1/2 | hdg sq bolt w/nut b18.2.1 | 56 |
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| THRDFAST | AL | Square Head Bolt | Steel | Galvanized | 5/8-11 x 18 | square hd bolt rt6 hdg b18.2.1 | 3 |
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| THRDFAST | AL | Square Head Bolt | Steel | Galvanized | 5/8-11 x 8 | square hd bolt rt4 hdg w/nut b18.2.1 | 5 |
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| THRDFAST | AL | Square Head Bolt | Steel | Galvanized | 5/8-11 x 3 | square hd bolt hdg b18.2.1 | 5 |
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| KBS | TN | Square Head Bolt | Grade 8 | Plain | 5/8-11 x 3 | 5/8-11 x 3 square!machbolt gr-8 b18.2.1 | 156 |
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| KBS | TN | Square Head Bolt | Grade 5 | Plain | 5/8-11 x 3 1/2 | 5/8-11 x 3 1/2 square mach.bolt gr-5 b18.2.1 | 3 |
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| KBS | TN | Square Head Bolt | Steel | Galvanized | 5/8-11 x 2 | 5/8-11 x 2 square hd mach.bolt hdg! b18.2.1 | 260 |
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| THRDFAST | AL | Square Head Bolt | Steel | Galvanized | 5/8-11 x 16 | double arming bolt hdg w/4-sq nuts assm b18.2.1 | 152 |
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| THRDFAST | AL | Square Head Bolt | Steel | Galvanized | 5/8-11 x 14 | double arming bolt hdg w/4-sq nuts assm b18.2.1 | 23 |
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| THRDFAST | MS | Square Head Bolt | Steel | Plain | 5/8-11 x 3 | square hd bolt b18.2.1 | 15 |
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| THRDFAST | MS | Square Head Bolt | Steel | Galvanized | 5/8-11 x 2 | square hd bolt hdg b18.2.1 | 250 |
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| THRDFAST | FL | Square Head Bolt | Grade 8 | Plain | 5/8-11 x 9 3/4 | gr8 square hd bolt b18.2.1 | 1 |
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| THRDFAST | OK | Square Head Bolt | Steel | Plain | 5/8-11 x 3 | square hd bolt b18.2.1 | 1,641 |
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| WSB | KY | Square Head Bolt | Grade 2 | Plain | 5/8-11 x 1 1/2 | blt fullthread sqr gr2 (pl) 5/8-11x1 1/2 b18.2.1 | 1,283 |
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| All Size | TX | Square Head Bolt | Grade A | Plain | 5/8-11 x 3 | 5/8-11 x 3 a307 square head bolt plain b18.2.1 | 40 |
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| FACCA | Ont | Square Head Bolt | Grade 2 | Plain | 5/8-11 x 2 1/2 | machine bolt square head (no nut) 5/8-11 unc x 2 1/2 long grade 2 low carbon steel plain ansi b18.2.1 b18.2.1 | 11,760 |
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