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Square Head Bolts, All ASME Grades of Steel
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 .
No results for ASTM A449, but 200 ASTM A449 items displayed. For ASTM A449, click here.
| Buy Square Head Bolts from one of our FCH Network Members | ||||||||
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| Supplier | Loc | Type | Material | Finish | Size | Description | Qty | |
| 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 | 318 |
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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 | 33 |
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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 | Zinc/Clear | 5/16-18 x 1 1/4 | 5/16-18 x 1 1/4 square bolts zinc b18.2.1 | 17 |
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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 | 217 |
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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 | 62 |
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| B & K FAST | PA | Square Head Bolt | Grade 8 | Zinc/Yellow | 7/16-20 x 5 | 7/16-20 x 5 square bolts gr 8 z yellow b18.2.1 | 52 |
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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 | 3013 |
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| Set Screw | IL | Square Head Bolt | Steel | Plain | 1/2-13 x 1 | square knurled cup point heat treat r/c-45 per print | inquire |
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| Set Screw | IL | Square Head Bolt | Grade 8 | Plain | 1 1/8-7 x 15.0 | square bolt | inquire |
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| YANKEE | NH | Square Head Bolt | Steel | Plain | 5/16-18 x 3 | 5/16-18 x 3 square hd bolt | 136 |
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| YANKEE | NH | Square Head Bolt | Steel | Plain | 5/16-18 x 1 3/4 | 5/16-18 x 1-3/4 square head bolt | 342 |
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| YANKEE | NH | Square Head Bolt | Steel | Plain | 5/16-18 x 2 | 5/16-18 x 2 square hd bolt | 192 |
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| YANKEE | NH | Square Head Bolt | Steel | Plain | 3/8-16 x 4 | 3/8-16 x 4 square hd bolt | 364 |
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| YANKEE | NH | Square Head Bolt | Grade A | Plain | 1/2-13 x 1 1/2 | 1/2-13 x 1-1/2 square head bolt astm a307 | 106 |
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| YANKEE | NH | Square Head Bolt | Grade 5 | Plain | 1/2-13 x 1 1/2 | 1/2-13 x 1-1/2 square head bolt grade 5 plain finish | 53 |
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| YANKEE | NH | Square Head Bolt | Steel | Plain | 1/2-13 x 2 | 1/2-13 x 2 square hd bolt | 2 |
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| YANKEE | NH | Square Head Bolt | Grade A | Plain | 1/2-13 x 2 1/2 | 1/2-13 x 2-1/2 square head bolt astm a307 | 292 |
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| YANKEE | NH | Square Head Bolt | Steel | Plain | 1/2-13 x 3 1/2 | 1/2-13 x 3 1/2 square hd bolt | 120 |
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| YANKEE | NH | Square Head Bolt | Steel | Plain | 1/2-13 x 5 | 1/2-13 x 5 square hd bolt | 11 |
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| YANKEE | NH | Square Head Bolt | Steel | Plain | 5/8-11 x 2 | 5/8-11 x 2 square hd bolt | 19 |
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| YANKEE | NH | Square Head Bolt | Steel | Plain | 5/8-11 x 2 1/2 | 5/8-11 x 2 1/2 square hd bolt | 7 |
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| YANKEE | NH | Square Head Bolt | Steel | Plain | 5/8-11 x 4 | 5/8-11 x 4 square hd bolt | 20 |
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| YANKEE | NH | Square Head Bolt | Steel | Plain | 5/8-11 x 7 | 5/8-11 x 7 square hd bolt | 38 |
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| YANKEE | NH | Square Head Bolt | Steel | Plain | 3/4-10 x 2 1/4 | 3/4-10 x 2 1/4 square hd bolt | 70 |
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| YANKEE | NH | Square Head Bolt | Steel | Plain | 3/4-10 x 3 1/2 | 3/4-10 x 3 1/2 square hd bolt | 17 |
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| ACCURATE | IL | Square Head Bolt | Steel | Plain | 1/2-13 x 13 | bolt square machine | 200 |
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| ACCURATE | IL | Square Head Bolt | Steel | Plain | 1/2-13 x 6 1/2 | 1/2-13x6 1/2 bolt square machine plain | 150 |
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| ACCURATE | IL | Square Head Bolt | Grade 5 | Zinc/Clear | 5/8-11 x 3 1/4 | bolt square machine gr5 | 10 |
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| ACCURATE | IL | Square Head Bolt | Steel | Plain | 1-8 x 5 | bolt square machine | 30 |
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| ACCURATE | IL | Square Head Bolt | Steel | Plain | 1/4-20 x 2 1/2 | bolt square machine black | 400 |
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| ACCURATE | IL | Square Head Bolt | Steel | Plain | 1/4-20 x 3 1/4 | bolt square machine | 200 |
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| ACCURATE | IL | Square Head Bolt | Steel | Zinc/Clear | 1/4-20 x 3 1/4 | bolt square machine | 1500 |
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| ACCURATE | IL | Square Head Bolt | Steel | Zinc/Clear | 5/16-18 x 1 | bolt square machine | 2780 |
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| ACCURATE | IL | Square Head Bolt | Steel | Zinc/Clear | 3/8-16 x 2 1/4 | bolt square machine f/t | 932 |
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| ACCURATE | IL | Square Head Bolt | Steel | Zinc/Clear | 3/8-16 x 5 1/2 | bolt square machine | 1100 |
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| ACCURATE | IL | Square Head Bolt | Steel | Zinc/Clear | 7/16-14 x 4 3/4 | bolt square machine | 170 |
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| ACCURATE | IL | Square Head Bolt | Steel | Plain | 1/2-13 x 1 3/4 | bolt square machine | 600 |
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| ACCURATE | IL | Square Head Bolt | Steel | Plain | 5/8-11 x 8 1/2 | bolt square machine | 50 |
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| ACCURATE | IL | Square Head Bolt | Steel | Plain | 5/8-11 x 1 1/4 | bolt square machine | 540 |
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| ACCURATE | IL | Square Head Bolt | Steel | Zinc/Clear | 5/8-11 x 1 1/4 | bolt square machine | 215 |
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| ACCURATE | IL | Square Head Bolt | Steel | Plain | 7/8-9 x 1 1/2 | bolt square machine | 105 |
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| American | NY | Square Head Bolt | Grade 5 | Plain | 5/16-24 x 1 | 5/16-24 x 1 square bolt grade 5 | 2220 |
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| American | NY | Square Head Bolt | Grade 5 | Plain | 5/16-24 x 1 | 5/16-24 x 1 square bolt grade 5 plain | 672 |
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| American | NY | Square Head Bolt | Steel | Zinc/Clear | 3/8-16 x 6 | square m/b zp | 44 |
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| American | NY | Square Head Bolt | Steel | Plain | 5/6-18 x 5 1/2 | square bolt | 250 |
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| American | NY | Square Head Bolt | Steel | Plain | 1/4-20 x 5/8 | square m/b | 100 |
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| American | NY | Square Head Bolt | Steel | Plain | 5/16-18 x 2 1/2 | square m/b | 50 |
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| American | NY | Square Head Bolt | Steel | Cadmium | 5/16-18 x 3 | square bolt | 700 |
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| American | NY | Square Head Bolt | Steel | Plain | 5/16-18 x 4 | square bolt | 2450 |
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| American | NY | Square Head Bolt | Steel | Plain | 5/16-18 x 5 | square bolt | 900 |
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| American | NY | Square Head Bolt | Steel | Black Oxide | 1/4-20 x 3/4 | square m/b black ox | 5150 |
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| American | NY | Square Head Bolt | Steel | Black Oxide | 3/8-16 x 2 | square hd m/b black ox | 2380 |
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| American | NY | Square Head Bolt | Steel | Zinc/Clear | 3/8-16 x 2 1/4 | square hd m/b pl | 500 |
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| American | NY | Square Head Bolt | Steel | Zinc/Yellow | 3/8-16 x 2 1/2 | square hd m/b zy | 1000 |
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| American | NY | Square Head Bolt | Steel | Plain | 3/8-16 x 4 1/2 | square m/b | 50 |
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| American | NY | Square Head Bolt | Steel | Black Oxide | 3/8-16 x 4 1/2 | square hd m/b black ox | 10 |
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| American | NY | Square Head Bolt | Steel | Plain | 1/4-20 x 1 1/4 | square m/b | 10000 |
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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 | 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 | 1/2-13 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 | Grade 8 | Plain | 3/4-10 x 2 1/2 | 3/4-10 x 2-1/2 square head bolt gr.8 plain b18.2.1 | 30 |
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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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| Jackson | MS | Square Head Bolt | Grade 2 | Galvanized | 1/2-13 x 1 1/2 | square bolt hdg | 212 |
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| Jackson | MS | Square Head Bolt | Grade 2 | Plain | 1/2-13 x 1 1/4 | square bolt gr. 2 | 400 |
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| Jackson | MS | Square Head Bolt | Grade 2 | Plain | 1/2-13 x 4 1/2 | square bolt gr. 2 | 1 |
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| Jackson | MS | Square Head Bolt | Grade 2 | Plain | 3/4-10 x 3 1/2 | square bolt gr. 2 | 2 |
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| Jackson | MS | Square Head Bolt | Grade 2 | Plain | 1 1/8 x 4 | nc square bolt gr. 2 | 78 |
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| Jackson | MS | Square Head Bolt | Grade 2 | Zinc/Clear | 5/16 x 1 | nc square bolt gr. 2 | 107 |
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| Jackson | MS | Square Head Bolt | Grade 2 | Zinc/Clear | 5/16 x 1 1/2 | nc square bolt gr. 2 | 7 |
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| Jackson | MS | Square Head Bolt | Grade 2 | Zinc/Clear | 3/8 x 1 1/2 | nc square bolt gr. 2 | 2 |
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| Jackson | MS | Square Head Bolt | Grade 5 | Plain | 1/2-13 x 3 1/2 | square | 2 |
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| Jackson | MS | Square Head Bolt | Grade 5 | Plain | 1/2-13 x 4 | nc square bolt gr. 5 fastenel # 0168684 or equal | 167 |
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| Jackson | MS | Square Head Bolt | Grade 5 | Plain | 5/8-11 x 4 1/2 | nc square bolt gr. 5 f/t | 3 |
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| Jackson | MS | Square Head Bolt | Grade 5 | Plain | 3/4-10 x 4 1/2 | square | 25 |
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| Jackson | MS | Square Head Bolt | Grade 5 | Plain | 1-8 x 3 1/2 | square | 25 |
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| Jackson | MS | Square Head Bolt | Grade 5 | Zinc/Clear | 1/2-13 x 1 | nc square bolt gr.5 | 46 |
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| Jackson | MS | Square Head Bolt | Grade 5 | Zinc/Clear | 1/2-13 x 1 1/2 | nc square bolt gr.5 | 36 |
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| Jackson | MS | Square Head Bolt | Grade 5 | Zinc/Clear | 1/2-20 x 2 | nc square bolt gr.5 | 42 |
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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 | 6 |
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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 | 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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| 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 | 200 |
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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 | Phosphate | M3/8-16 x 1 1/2 | bolt and nut combo square 3/8-16x1-1/2 steel phosphate black | 200 |
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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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| CNB | IL | Square Head Bolt | Grade 2 | Plain | 1 1/4-7 x 13 | square m/b with 4 inches of thread per drawing b1023 item 3 | 5 |
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| CNB | IL | Square Head Bolt | Grade 2 | Plain | 1/4-20 x 1 1/2 | square m/b | 400 |
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| CNB | IL | Square Head Bolt | Grade 2 | Zinc/Clear | 1/4-20 x 1 1/2 | square m/b | 200 |
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| RCFast | AZ | Square Head Bolt | Grade 5 | Plain | 3/8-16 x 1/2 | per print (bolt, sq hd, gr5, l.h., smoothface, ) | inquire |
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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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