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Square Head Bolts, Steel or Grade A (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 .
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| Buy Square Head Bolts from one of our FCH Network Members | ||||||||
|---|---|---|---|---|---|---|---|---|
| Supplier | Loc | Type | Material | Finish | Size | Description | Qty | |
| GLF | OH | Square Head Bolt | Grade A | Plain | 3/8-16 x 3 | 3/8-16x3 square hd bolt a307 stl pln b18.2.1 () () () | 28 |
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| GLF | OH | Square Head Bolt | Steel | Plain | 3/4-10 x 4 | 3/4-10x4 square hd bolt stl pln b18.2.1 () () () | 31 |
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| GLF | OH | Square Head Bolt | Grade A | Plain | 1-8 x 4 | 1-8x4 square hd bolt a307 stl pln b18.2.1 () | 2 |
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| GLF | OH | Square Head Bolt | Steel | Plain | 1/2-13 x 5 1/2 | 1/2-13x5-1/2 square hd bolt stl pln b18.2.1 () | 310 |
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| GLF | OH | Square Head Bolt | Grade A | Plain | 3/4-10 x 6 1/2 | 3/4-10x6-1/2 square hd bolt a307 stl pln b18.2.1 () | 1 |
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| GLF | OH | Square Head Bolt | Grade A | Plain | 1 1/4-7 x 10 | 1-1/4-7x10 square hd bolt a307 stl pln b18.2.1 () | 40 |
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| Ababa | CA | Square Head Bolt | Steel | Plain | 3/8-16 x 5 1/2 | 3/8-16 x 5-1/2 sq hd bolt steel pln b18.2.1 | 189 |
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| Ababa | CA | Square Head Bolt | Steel | Plain | 1/2-13 x 4 | 1/2-13 x 4 sq hd bolt steel pln b18.2.1 | 1 |
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| Ababa | CA | Square Head Bolt | Steel | Zinc/Clear | 3/4-10 x 2 3/4 | 3/4-10 x 2 3/4 sq hd bolt steel znc b18.2.1 | 127 |
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| 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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| Ababa | CA | Square Head Bolt | Steel | Plain | 1/4-20 x 1 1/2 | 1/4-20 x 1 1/2 sq hd blt steel pln b18.2.1 | 200 |
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| Ababa | CA | Square Head Bolt | Steel | Zinc/Clear | 1/4-20 x 2 | 1/4-20 x 2 sq hd blt full thrd steel znc b18.2.1 | 1390 |
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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 | Plain | 1/2-13 x 1 | (ft) coarse a307 gra square hd m/b low carb b18.2.1 | 260 |
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| ASMC | IL | Square Head Bolt | Grade A | Galvanized | 3/8-16 x 4 | a307 gra square hd m/b low carb hdg b18.2.1 | 275 |
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| ASMC | IL | Square Head Bolt | Grade A | Plain | 1/2-13 x 3 | (pt) coarse a307 gra square hd m/b low carb b18.2.1 | 25 |
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| ASMC | IL | Square Head Bolt | Grade A | Plain | 1/2-13 x 5 | (pt) coarse a307 gra square hd m/b low carb b18.2.1 | 10 |
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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 | Zinc/Clear | 7/8-9 x 4 | a307 gra square hd m/b low carb zp b18.2.1 | 24 |
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| Ababa | CA | Square Head Bolt | Steel | Plain | 3/8-16 x 2 1/2 | 3/8-16 x 2 1/2 sq hd bolt steel pln b18.2.1 | 1 |
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| Ababa | CA | Square Head Bolt | Steel | Plain | 1/4-20 x 2 | 1/4-20 x 2 sq hd blt full thrd steel pln b18.2.1 | 2190 |
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| QFC | TX | Square Head Bolt | Grade A | Galvanized | 3/8-16 x 3/4 | 3/8-16x3/4 square head bolt a307 hdg b18.2.1 | 987 |
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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 | 3/4-10 x 13 | 3/4-10x13 sq. head bolt a307 hdg b18.2.1 | 14 |
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| QFC | TX | Square Head Bolt | Grade A | Galvanized | 3/4-10 x 12 | 3/4-10x12 sq. head bolt a307 hdg b18.2.1 | 22 |
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| QFC | TX | Square Head Bolt | Grade A | Galvanized | 3/4-10 x 14 | 3/4-10x14 sq. hd bolt hdg a307 6 thd b18.2.1 | 30 |
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| QFC | TX | Square Head Bolt | Grade A | Galvanized | 3/4-10 x 15 | 3/4-10x15 square head bolt a307 hdg b18.2.1 | 30 |
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| QFC | TX | Square Head Bolt | Grade A | Galvanized | 3/4-10 x 16 | 3/4-10x16 square head bolt a307 hdg 6 thd b18.2.1 | 237 |
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| QFC | TX | Square Head Bolt | Grade A | Galvanized | 3/4-10 x 16 | 3/4-10x16 square head bolt a307 hdg 6 thd b18.2.1 | 20 |
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| QFC | TX | Square Head Bolt | Grade A | Galvanized | 3/4-10 x 17 | 3/4-10x17 square head bolt a307 hdg 6 thd b18.2.1 | 37 |
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| QFC | TX | Square Head Bolt | Grade A | Galvanized | 3/4-10 x 18 | 3/4-10x18 square head bolt a307 hdg 6 thd b18.2.1 | 56 |
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| QFC | TX | Square Head Bolt | Grade A | Galvanized | 3/4-10 x 19 | 3/4-10x19 sq. head bolt a307 hdg 6 thd b18.2.1 | 40 |
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| QFC | TX | Square Head Bolt | Grade A | Galvanized | 3/4-10 x 20 | 3/4-10x20 square head bolt a307 hdg 6 thd b18.2.1 | 6 |
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| Cascade | OR | Square Head Bolt | Steel | Plain | 3/4-10 x 3 1/2 | square m/b b18.2.1 | 57 |
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| Cascade | OR | Square Head Bolt | Steel | Plain | 7/8-9 x 12 | square m/b b18.2.1 | 9 |
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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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| Cascade | OR | Square Head Bolt | Steel | Plain | 1/4-20 x 1 | square m/b b18.2.1 | 800 |
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| B & K FAST | PA | Square Head Bolt | Steel | Galvanized | 1/4-20 x 1 | 1/4-20 x 1 galv square bolts b18.2.1 | 79 |
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| B & K FAST | PA | Square Head Bolt | Steel | Galvanized | 1/4-20 x 1 1/2 | 1/4-20 x 1 1/2 galv square bolts b18.2.1 | 53 |
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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 | Galvanized | 3/4-10 x 7 1/2 | 3/4-10 x 7 1/2 galv square bolts b18.2.1 | 4 |
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| B & K FAST | PA | Square Head Bolt | Steel | Galvanized | 3/4-10 x 14 | 3/4-10 x 14 galv square bolts b18.2.1 | 1 |
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| B & K FAST | PA | Square Head Bolt | Steel | Galvanized | 7/8-9 x 16 | 7/8-9 x 16 galv square bolts 6 thread b18.2.1 | 32 |
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| B & K FAST | PA | Square Head Bolt | Steel | Plain | 1/4-20 x 5 1/2 | 1/4-20 x 5 1/2 square bolts plain b18.2.1 | 20 |
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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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| B & K FAST | PA | Square Head Bolt | Steel | Plain | 3/8-16 x 1 1/4 | 3/8-16 x 1 1/4 square bolts plain b18.2.1 | 6 |
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| B & K FAST | PA | Square Head Bolt | Steel | Zinc/Clear | 3/8-16 x 1 1/4 | 3/8-16 x 1 1/4 square bolts zinc b18.2.1 | 854 |
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| B & K FAST | PA | Square Head Bolt | Steel | Plain | 3/8-16 x 2 | 3/8-16 x 2 square bolts plain b18.2.1 | 215 |
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| B & K FAST | PA | Square Head Bolt | Steel | Plain | 3/8-16 x 7 1/2 | 3/8-16 x 7 1/2 square bolts plain b18.2.1 | 2 |
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| B & K FAST | PA | Square Head Bolt | Steel | Plain | 1/2-13 x 1 1/4 | 1/2-13 x 1 1/4 square bolts plain b18.2.1 | 2788 |
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| B & K FAST | PA | Square Head Bolt | Steel | Plain | 1/2-13 x 1 1/2 | 1/2-13 x 1 1/2 square bolts plain b18.2.1 | 323 |
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| B & K FAST | PA | Square Head Bolt | Steel | Plain | 1/2-13 x 1 3/4 | 1/2-13 x 1 3/4 square bolts plain full thread b18.2.1 | 1 |
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| B & K FAST | PA | Square Head Bolt | Steel | Plain | 1/2-13 x 2 | 1/2-13 x 2 square bolts plain b18.2.1 | 197 | < ul>Contact_Supplier |
| B & K FAST | PA | Square Head Bolt | Steel | Plain | 1/2-13 x 3 | 1/2-13 x 3 square bolts plain b18.2.1 | 244 |
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| B & K FAST | PA | Square Head Bolt | Steel | Plain | 1/2-13 x 3 1/4 | 1/2-13 x 3 1/4 square bolts plain b18.2.1 | 495 |
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| B & K FAST | PA | Square Head Bolt | Steel | Plain | 1/2-13 x 3 1/2 | 1/2-13 x 3 1/2 square bolts plain b18.2.1 | 8 |
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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 | Steel | Plain | 1/2-13 x 1 | 1/2-13x1 square machine bolts steel plain b18.2.1 | 450 |
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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 | Grade A | Plain | 3/8-16 x 1 3/4 | 3/8-16x1-3/4 (pt) square bolt steel a307 plain b18.2.1 | 250 |
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| JET FITTING | CA | Square Head Bolt | Grade A | Plain | 3/8-16 x 2 3/4 | 3/8-16x2 3/4 (pt) bolts square head bolts a307 grade a square head bolt plain (inch) b18.2.1 | 400 |
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| JET FITTING | CA | Square Head Bolt | Grade A | Plain | 3/8-16 x 5 | 3/8-16x5 (pt) bolts square head bolts a307 grade a square head bolt plain (inch) b18.2.1 | 150 |
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| JET FITTING | CA | Square Head Bolt | Grade A | Plain | 1/2-13 x 3 1/2 | 1/2-13x3-1/2 (pt) square bolt steel a307 plain b18.2.1 | 54 |
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| JET FITTING | CA | Square Head Bolt | Grade A | Plain | 1/2-13 x 7 | 1/2-13x7 (pt) square bolt steel a307 plain 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 (pt) square bolt steel a307 plain b18.2.1 | 95 |
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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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| 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 | Plain | 1/2-13 x 3 1/2 | square hd bolt b18.2.1 | 145 |
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| THRDFAST | FL | Square Head Bolt | Steel | Galvanized | 1/2-13 x 1 1/4 | square hd bolt hdg b18.2.1 | 112 |
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| THRDFAST | FL | Square Head Bolt | Steel | Galvanized | 3/8-16 x 11 | square hd bolt hdg b18.2.1 | 108 |
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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 | Galvanized | 3/4-10 x 3 | square hd bolt hdg b18.2.1 | 20 |
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| THRDFAST | FL | Square Head Bolt | Steel | Plain | 3/8-16 x 2 1/2 | square hd bolt b18.2.1 | 3 |
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| THRDFAST | FL | Square Head Bolt | Steel | Galvanized | 7/8-9 x 42 | square hd bolt rt6 hdg b18.2.1 | stock |
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| THRDFAST | FL | Square Head Bolt | Steel | Galvanized | 3/4-10 x 16 | square hd bolt hdg b18.2.1 | 24 |
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| THRDFAST | FL | Square Head Bolt | Steel | Galvanized | 7/8-9 x 18 | square hd bolt rt6 hdg b18.2.1 | 10 |
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| THRDFAST | FL | Square Head Bolt | Steel | Plain | 1/2-13 x 3 1/2 | square hd bolt b18.2.1 | 8 |
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| THRDFAST | FL | Square Head Bolt | Steel | Galvanized | 7/8-9 x 22 | square hd bolt hdg b18.2.1 | 5 |
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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 | 1 1/8-7 x 4 1/2 | square hd bolt b18.2.1 | 4 |
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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 | FL | Square Head Bolt | Steel | Galvanized | 7/8-9 x 42 | square hd bolt rt6 hdg b18.2.1 | 3 |
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| THRDFAST | FL | Square Head Bolt | Steel | Galvanized | 7/8-9 x 46 | square hd bolt rt6 hdg b18.2.1 | 3 |
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| THRDFAST | FL | Square Head Bolt | Steel | Plain | 1 1/4-7 x 10 | square hd bolt b18.2.1 | 2 |
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| THRDFAST | FL | Square Head Bolt | Steel | Galvanized | 7/8-9 x 44 | square hd bolt rt6 hdg b18.2.1 | 2 |
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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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