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5/16 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 .
36 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 | |
| BIG BOLT | IL | Square Head Bolt | 300 Stainless (A1,A2, 18-8,304,310 etc.) | Plain | 5/16-18 x 3 1/2 | bolt & c/s square bolt300 (a1 a2 18-8 304 310 etc.)square b18.2.1 | 1000 |
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| BIG BOLT | IL | Square Head Bolt | Steel | Plain | 5/16-18 x 9 1/2 | bolt & c/s square boltsquare b18.2.1 | 3398 |
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| BIG BOLT | IL | Square Head Bolt | Grade 5 | Plain | 5/16-18 x 6 | bolt & c/s square boltsquare b18.2.1 | 4700 |
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| BIG BOLT | IL | Square Head Bolt | 300 Stainless (A1,A2, 18-8,304,310 etc.) | Plain | 5/16-18 x 4 | bolt & c/s square bolt300 (a1 a2 18-8 304 310 etc.)square b18.2.1 | 1500 |
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| BIG BOLT | IL | Square Head Bolt | Grade 5 | Plain | 5/16-18 x 2 | bolt & c/s square boltsquare b18.2.1 | 5000 |
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| BIG BOLT | IL | Square Head Bolt | Steel | Plain | 5/16-18 x 14 | bolt & c/s square boltsquare b18.2.1 | 500 |
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| BIG BOLT | IL | Square Head Bolt | 300 Stainless (A1,A2, 18-8,304,310 etc.) | Plain | 5/16-18 x 6 | 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 | 5/16-18 x 3/4 | bolt & c/s square boltsquare b18.2.1 | 5500 |
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| BIG BOLT | IL | Square Head Bolt | Grade 5 | Plain | 5/16-18 x 4 | bolt & c/s square boltsquare b18.2.1 | 34100 |
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| BIG BOLT | IL | Square Head Bolt | Grade 5 | Plain | 5/16-18 x 1 | bolt & c/s square boltsquare b18.2.1 | 5000 |
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| BIG BOLT | IL | Square Head Bolt | Steel | Plain | 5/16-18 x 16 | bolt & c/s square boltsquare b18.2.1 | 1000 |
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| BIG BOLT | IL | Square Head Bolt | Steel | Plain | 5/16-18 x 12 | bolt & c/s square boltsquare b18.2.1 | 1000 |
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| BIG BOLT | IL | Square Head Bolt | 300 Stainless (A1,A2, 18-8,304,310 etc.) | Plain | 5/16-18 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 8 | Zinc/Clear | 5/16-18 x 2 3/4 | bolt & c/s square boltsquare b18.2.1 | 1580 |
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| BIG BOLT | IL | Square Head Bolt | Grade 5 | Plain | 5/16-18 x 3 | bolt & c/s square boltsquare b18.2.1 | 2900 |
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| BIG BOLT | IL | Square Head Bolt | Steel | Plain | 5/16-18 x 10 | bolt & c/s square boltsquare b18.2.1 | 1000 |
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| BIG BOLT | IL | Square Head Bolt | Grade 5 | Plain | 5/16-18 x 2 1/2 | bolt & c/s square boltsquare b18.2.1 | 5000 |
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| BIG BOLT | IL | Square Head Bolt | Steel | Plain | 5/16-18 x 16 | bolt & c/s square boltsquare b18.2.1 | 500 |
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| BIG BOLT | IL | Square Head Bolt | Grade 5 | Plain | 5/16-18 x 5 | bolt & c/s square boltsquare b18.2.1 | 5000 |
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| ASMC | IL | Square Head Bolt | Grade A | Galvanized | 5/16-18 x 3 | a307 gra square hd m/b low carb hdg b18.2.1 | 150 |
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| ASMC | IL | Square Head Bolt | Grade A | Galvanized | 5/16-18 x 3/4 | a307 gra square hd m/b low carb hdg b18.2.1 | 1,400 |
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| ASMC | IL | Square Head Bolt | Grade A | Galvanized | 5/16-18 x 1 1/2 | a307 gra square hd m/b low carb hdg b18.2.1 | 625 |
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| ASMC | IL | Square Head Bolt | Grade A | Galvanized | 5/16-18 x 2 1/2 | a307 gra square hd m/b low carb hdg b18.2.1 | 350 |
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| JET FITTING | CA | Square Head Bolt | Grade A | Plain | 5/16-18 x 3 1/2 | 5/16-18x3 1/2 a307 gr a square hd bolt 747061 b18.2.1 | 320 |
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| JET FITTING | CA | Square Head Bolt | Grade A | Plain | 5/16-18 x 3/4 | 5/16-18x3/4 a307 gr a square hd bolt pl 747046 b18.2.1 | 600 |
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| B & K FAST | PA | Square Head Bolt | Steel | Plain | 5/16-18 x 1 1/2 | 5/16-18 x 1 1/2 square bolts plain b18.2.1 | 1126 |
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| OSSCO | RI | Square Head Bolt | Steel | Plain | 5/16-18 x 1 1/2 | 5/16-18x1 1/2 square hd mach bolt b18.2.1 | 29 |
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| OSSCO | RI | Square Head Bolt | Steel | Zinc/Clear | 5/16-18 x 3 | 5/16-18x3 square hd mach bolt plated b18.2.1 | 400 |
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| JET FITTING | CA | Square Head Bolt | Steel | Plain | 5/16-18 x 3/4 | bolt square 5/1618x3/4 s b18.2.1 | 600 |
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| JET FITTING | CA | Square Head Bolt | Grade A | Plain | 5/16-18 x 3 1/2 | 5/16-18x3-1/2 (pt) square bolt steel a307 plain b18.2.1 | 500 |
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| JET FITTING | CA | Square Head Bolt | Steel | Black Oxide | 5/16-18 x 3/4 | bolt square 5/16-18x3/4 steel black oxide and wax b18.2.1 | 2000 |
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| KBS | TN | Square Head Bolt | Steel | Plain | 5/16-18 x 1 1/2 | 5/16-18 x 1 1/2 square hd mach.bolt b18.2.1 | 220 |
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| THRDFAST | MS | Square Head Bolt | Steel | Plain | 5/16-18 x 2 1/4 | square hd bolt b18.2.1 | 80 |
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| THRDFAST | MS | Square Head Bolt | Steel | Plain | 5/16-18 x 2 1/2 | square hd bolt b18.2.1 | 100 |
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| THRDFAST | MS | Square Head Bolt | Steel | Plain | 5/16-18 x 3/4 | square hd bolt b18.2.1 | 80 |
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| WSB | KY | Square Head Bolt | Steel | Plain | 5/16-18 x 7 1/4 | blt bnt sq st 5/16-18x7.25 b18.2.1 | 32 |
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