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Square Head Bolts
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 .
3,147 Square Head Bolt, showing 200, (click on any line for more information)
| Buy Square Head Bolts from one of our FCH Network Members | ||||||||
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| Supplier | Loc | Type | Material | Finish | Size | Description | Qty | |
| Hayes | CA | Square Head Bolt | Grade 2 | Galvanized | 1-8 x 28 | 1-8x28 square head bolt gr.2 hdg | 1 |
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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 2 | 5/16-18 x 2 square hd bolt | 192 |
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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 | 160 |
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| YANKEE | NH | Square Head Bolt | Steel | Plain | 3/8-16 x 4 | 3/8-16 x 4 square hd bolt | 334 |
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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 | 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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| YANKEE | NH | Square Head Bolt | Steel | Plain | 3/4-10 x 4 | 3/4-10 x 4 square hd bolt | 35 |
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| YANKEE | NH | Square Head Bolt | Steel | Plain | 3/4-10 x 4 1/2 | 3/4-10 x 4 1/2 square hd bolt | 2 |
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| YANKEE | NH | Square Head Bolt | Steel | Plain | 3/4-10 x 6 | 3/4-10 x 6 square hd bolt | 26 |
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| YANKEE | NH | Square Head Bolt | Steel | Plain | 7/8-9 x 4 | 7/8-9 x 4 square hd bolt | 17 |
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| YANKEE | NH | Square Head Bolt | Grade 5 | Zinc/Clear | 5/8-11 x 7 | 5/8-11x7 square head bolt grade 5 steel zinc plated | 38 |
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| Weaver | WA | Square Head Bolt | Grade 5 | Plain | 5/8-11 x 2 3/4 gr5 square hd bolt plain | 13 |
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| Jackson | MS | Square Head Bolt | Grade 2 | Galvanized | 1/2-13 x 1 1/2 | square bolt hdg | 112 |
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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 | 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 | 82 |
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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 | 143 |
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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 | 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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| Jackson | MS | Square Head Bolt | Grade 5 | Zinc/Clear | 5/8-11 x 2 1/2 | nc square bolt gr.5 | 8 |
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| Jackson | MS | Square Head Bolt | Grade 5 | Zinc/Clear | 5/8-11 x 3 | nc square bolt gr.5 | 2 |
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| Jackson | MS | Square Head Bolt | Grade 5 | Zinc/Clear | 3/4 x 2 | nc square bolt gr.5 | 20 |
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| Jackson | MS | Square Head Bolt | Grade 5 | Zinc/Clear | 3/4 x 2 1/2 | nc square bolt gr.5 | 12 |
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| Jackson | MS | Square Head Bolt | Grade 8 | Plain | 5/8-11 x 2 1/2 | square bolt gr. 8 | 1 |
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| Jackson | MS | Square Head Bolt | Grade 8 | Plain | 3/4-10 x 3 1/2 | square bolt gr. 8 | 2 |
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| METRO IND | OH | Square Head Bolt | Steel | Plain | M14 x 125 | m14 x 125 sq. leveling bolt plate 25mm thick steel | 32 |
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| Jackson | MS | Square Head Bolt | Grade 5 | Plain | 1-8 x 11 square head grade 5 plain | 3 |
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| Jackson | MS | Square Head Bolt | Grade 5 | Plain | 1-8 x 12 square head grade 5 plain | 2 |
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| Jackson | MS | Square Head Bolt | Grade 8 | Plain | 1 1/4 x 12 square head bolt gr. 8 plain | 4 |
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| Weaver | WA | Square Head Bolt | Grade 5 | Plain | 5/8-11 x 3 1/2 | 5/8-11x3 1/2 gr5 square hd bolt plain | 14 |
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| Weaver | WA | Square Head Bolt | Grade 5 | Plain | 7/8-9 x 6 | 7/8-9x6 gr5 square hd bolt plain | 12 |
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| Weaver | WA | Square Head Bolt | Grade 5 | Plain | 1/2-13 x 3 3/4 | 1/2-13 x 3 3/4 gr5 square hd bolt plain | 25 |
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| Jackson | MS | Square Head Bolt | Grade 8 | Plain | 1 1/4 x 6 | square bolt gr. 8 | 20 |
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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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| ACCURATE | IL | Square Head Bolt | Steel | Plain | 1/2-13 x 6 1/2 | 1/2-13x6 1/2 bolt square machine plain | 80 |
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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 | 350 |
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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 | 3500 |
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| ACCURATE | IL | Square Head Bolt | Steel | Zinc/Clear | 3/8-16 x 2 1/4 | bolt square machine f/t | 1220 |
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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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| ACCURATE | IL | Square Head Bolt | Steel | Plain | 7/8-9 x 16 | bolt square machine | 2 |
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| ACCURATE | IL | Square Head Bolt | Steel | Plain | 7/8-9 x 1 3/4 | bolt square machine | 65 |
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| ACCURATE | IL | Square Head Bolt | Steel | Plain | 7/8-9 x 18 | bolt square machine | 4 |
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| ACCURATE | IL | Square Head Bolt | Steel | Plain | 7/8-9 x 3 1/4 | bolt square machine | 93 |
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| ACCURATE | IL | Square Head Bolt | Steel | Zinc/Clear | 7/8-9 x 3 1/4 | bolt square machine | 42 |
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| OneMonroe | NC | Square Head Bolt | Steel | Galvanized | 5/16-18 x 3 | 5/16-18 x 3 galvanized square head bolt | 250 |
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| OneMonroe | NC | Square Head Bolt | Grade A | Zinc/Clear | 5/16-18 x 3 | 5/16-18 x 3 a307a zinc finish square head bolts | 500 |
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| OneMonroe | NC | Square Head Bolt | Grade A | Plain | 1/2-13 x 1 1/2 | 1/2-13 x 1 1/2 a307a plain finish square head bolt | 124 |
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| OneMonroe | NC | Square Head Bolt | Grade A | Zinc/Clear | 1/2-13 x 1 3/4 | 1/2-13 x 1 3/4 square head bolt a307a zinc finish | 322 |
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| OneMonroe | NC | Square Head Bolt | Grade A | Plain | 5/8-11 x 3 1/2 | 5/8-11 x 3 1/2 a307a plain finish square head bolt | 74 |
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| OneMonroe | NC | Square Head Bolt | Grade A | Plain | 5/8-11 x 4 | 5/8-11 x 4 a307a plain finish square head bolt | 103 |
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| OneMonroe | NC | Square Head Bolt | Grade A | Plain | 3/4-10 x 4 | 3/4-10 x 4 a307a plain finish square head bolt | 65 |
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| OneMonroe | NC | Square Head Bolt | Grade A | Plain | 7/8-9 x 5 | 7/8-9 x 5 a307a plain finish square head bolt | 20 |
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| OneMonroe | NC | Square Head Bolt | Grade 2 | Plain | 1/2-13 x 3 1/2 | 1/2-13 x 3-1/2 sq hd gr2 pln. bolt | 25 |
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| OneMonroe | NC | Square Head Bolt | Steel | Plain | #6 | 6 square corner flush bolt | 1 |
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| OneMonroe | NC | Square Head Bolt | Steel | Plain | 5/16-18 x 3/4 | 5/16-18 x 3/4 sq hd c/s-pln | 40 |
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| OneMonroe | NC | Square Head Bolt | Steel | Plain | 1/2-13 x 4 | 1/2-13 x 4 sq hd c/s-pln | 119 |
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| OneMonroe | NC | Square Head Bolt | Steel | Plain | 5/8-11 x 12 | 5/8-11 x 12 sq hd c/s-plain | 36 |
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| OneMonroe | NC | Square Head Bolt | Steel | Plain | 5/8-11 x 12 | 5/8-11 x 12 sq hd c/s-hdg | 68 |
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| OneMonroe | NC | Square Head Bolt | Grade 5 | Plain | 3/4-10 x 4 | 3/4-10 x 4 sq hd c/s-gr 5-plain | 34 |
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| OneMonroe | NC | Square Head Bolt | Steel | Plain | 1-8 x 8 | 1-8 x 8 square t-bolt w/4 thread | 171 |
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| OneMonroe | NC | Square Head Bolt | Steel | Plain | 3/16 | packing graphited synthetic 3/16 square c/s (47 feet per pound) | 1.1 |
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| OneMonroe | MN | Square Head Bolt | 300 Stainless (A1,A2, 18-8,304,310 etc.) | Plain | 5/16-18 x 1 3/4 | 5/16-18 x 1-3/4 sq hd dog pt-s.s. | 50 |
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| OneMonroe | MN | Square Head Bolt | 300 Stainless (A1,A2, 18-8,304,310 etc.) | Plain | 5/16-18 x 1 3/4 | 5/16-18 x 1-3/4 sq hd dog pt-s.s. | 50 |
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| Future Fastener | TX | Square Head Bolt | Steel | Galvanized | 3/8-16 x 1 3/4 | 3/8-16x1-3/4 square head machine bolt hot dip galvanized | 1000 |
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| Jackson | MS | Square Head Bolt | Grade 8 | Plain | 5/8-11 x 4 1/2 | 5/8-11x4-1/2 square bolt gr. 8 | 1 |
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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 5 | square bolt | 700 |
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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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| American | NY | Square Head Bolt | Steel | Plain | 5/16-18 x 1 1/2 | square m/b | 100 |
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| American | NY | Square Head Bolt | Steel | Plain | 5/16-18 x 1 3/4 | square m/b f/t black | 60 |
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| American | NY | Square Head Bolt | Steel | Plain | 3/8-16 x 3 1/2 | square bolt | 150 |
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| American | NY | Square Head Bolt | Steel | Zinc/Clear | 1/2-13 x 1 1/2 | square m/b zp | 50 |
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| American | NY | Square Head Bolt | Steel | Zinc/Green | 1/2-13 x 2 | square m/b olive drab | 400 |
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| Jackson | MS | Square Head Bolt | Grade 5 | Plain | 3/4-10 x 4 1/2 | square | 13 |
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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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| 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 | 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 | 20 |
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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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| 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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| 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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| 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 | Grade 8 | Zinc/Yellow | 7/16-20 x 5 | 7/16-20 x 5 square bolts gr 8 z yellow b18.2.1 | 24 |
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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 | Grade 5 | Plain | 1/2-13 x 1 3/4 | 1/2-13 x 1 3/4 square bolts gr 5 plain b18.2.1 | 4 |
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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 |
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| 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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