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Square Head Bolts, Plain (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 5 | Plain | 3/4-10 x 3 | 3/4-10x3 square hd bolt grade 5 stl pln b18.2.1 () () () | 79 |
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| GLF | OH | Square Head Bolt | Grade 8 | Plain | 3/4-10 x 3 | 3/4-10x3 square hd bolt grade 8 stl pln b18.2.1 () () () | 5 |
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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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| BHAM | AL | Square Head Bolt | Steel | Plain | 3/4-10 x 8 | 3/4-10x8 square head m/b plain b18.2.1 | 40 |
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| BHAM | AL | Square Head Bolt | Steel | Plain | 7/8-9 x 4 1/2 | 7/8-9x4 1/2 square head bolt b18.2.1 | 5 |
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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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| 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 | Grade 5 | Plain | 1-8 x 20 | bolt & c/s square boltsquare b18.2.1 | 400 |
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| BIG BOLT | IL | Square Head Bolt | Grade 5 | Plain | 3/4-16 x 16 | bolt & c/s square boltb18.2.1 | 700 |
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| BIG BOLT | IL | Square Head Bolt | Grade 8 | Plain | 1 1/4-7 x 16 | bolt & c/s square boltsquare b18.2.1 | 500 |
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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 | 3/8-16 x 12 | bolt & c/s square boltsquare b18.2.1 | 500 |
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| BIG BOLT | IL | Square Head Bolt | Grade 5 | Plain | 7/16-14 x 2 1/2 | bolt & c/s square boltsquare b18.2.1 | 890 |
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| BIG BOLT | IL | Square Head Bolt | Grade 5 | Plain | 3/8-16 x 4 | 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 12 | bolt & c/s square boltsquare b18.2.1 | 700 |
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| BIG BOLT | IL | Square Head Bolt | Grade 8 | Plain | 3/8-16 x 10 | bolt & c/s square boltsquare b18.2.1 | 500 |
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| BIG BOLT | IL | Square Head Bolt | Grade 5 | Plain | 1 1/8-7 x 16 | bolt & c/s square boltsquare b18.2.1 b18.2.1 | 400 |
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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 8 | Plain | 3/4-10 x 8 | bolt & c/s square boltsquare b18.2.1 | 800 |
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| BIG BOLT | IL | Square Head Bolt | Grade 5 | Plain | 3/4-16 x 20 | bolt & c/s square boltb18.2.1 | 1100 |
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| BIG BOLT | IL | Square Head Bolt | Steel | Plain | 3/4-10 x 20 | bolt & c/s square boltsquare b18.2.1 | 200 |
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| BIG BOLT | IL | Square Head Bolt | Grade 8 | Plain | 7/16-14 x 5 | bolt & c/s square boltsquare b18.2.1 | 2500 |
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| BIG BOLT | IL | Square Head Bolt | Grade 5 | Plain | 7/8-9 x 14 | bolt & c/s square boltsquare b18.2.1 | 566 |
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| BIG BOLT | IL | Square Head Bolt | Grade 5 | Plain | 1/2-13 x 6 | bolt & c/s square boltsquare b18.2.1 | 10000 |
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| BIG BOLT | IL | Square Head Bolt | Grade 8 | Plain | 7/16-14 x 3 1/2 | bolt & c/s square boltsquare b18.2.1 | 1000 |
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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 | 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 | 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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| 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 | 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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| 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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| 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 | 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 | 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 | 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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| 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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| B & K FAST | PA | Square Head Bolt | Steel | Plain | 1/2-13 x 4 | 1/2-13 x 4 square bolts plain b18.2.1 | 708 |
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| B & K FAST | PA | Square Head Bolt | Steel | Plain | 1/2-13 x 6 | 1/2-13 x 6 square bolts plain b18.2.1 | 467 |
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| B & K FAST | PA | Square Head Bolt | Steel | Plain | 1/2-13 x 6 | 1/2-13 x 6 square bolts plain full thread b18.2.1 | 120 |
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| B & K FAST | PA | Square Head Bolt | Steel | Plain | 1/2-13 x 19 | 1/2-13 x 19 square bolts plain b18.2.1 | 38 |
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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 | 7/8-9 x 3 1/2 | 7/8-9 x 3 1/2 square bolts plain b18.2.1 | 523 |
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| B & K FAST | PA | Square Head Bolt | Steel | Plain | 7/8-9 x 4 | 7/8-9 x 4 square bolts plain b18.2.1 | 1 |
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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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| 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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| 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 | Grade 5 | Plain | 3/8-16 x 2 | gr5 square hd bolt b18.2.1 | 10 |
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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 | 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 | 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 | Plain | 1 1/4-7 x 10 | square hd bolt b18.2.1 | 2 |
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| THRDFAST | OK | Square Head Bolt | Steel | Plain | 1/2-13 x 1 3/4 | square hd bolt b18.2.1 | 480 |
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| THRDFAST | OK | Square Head Bolt | Steel | Plain | 1/2-13 x 2 | square hd bolt b18.2.1 | 430 |
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| THRDFAST | OK | Square Head Bolt | Steel | Plain | 1/2-13 x 1 1/4 | square hd bolt b18.2.1 | 400 |
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| THRDFAST | TN | Square Head Bolt | Steel | Plain | 1/2-13 x 1 3/4 | square hd bolt b18.2.1 | 50 |
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| THRDFAST | TN | Square Head Bolt | Steel | Plain | 3/4-10 x 17 | square hd bolt b18.2.1 | 6 |
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| THRDFAST | TN | Square Head Bolt | Grade 5 | Plain | 1-8 x 8 | gr5 square hd bolt b18.2.1 | 3 |
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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 | Grade 8 | Plain | 3/4 | nf-16x3 1/2 gr8 square hd bolt b18.2.1 | 400 |
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| THRDFAST | AL | Square Head Bolt | Silicon Bronze | Plain | 1/2-13 x 2 | sili brnz sq bolt b18.2.1 | 22 |
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| THRDFAST | AL | Square Head Bolt | Steel | Plain | 1 1/4-7 x 11 | square hd bolt b18.2.1 | 3 |
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| KBS | TN | Square Head Bolt | Grade 8 | Plain | 1-8 x 18 | 1-8 x 18 square mach bolt gr-8 b18.2.1 | 28 |
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| KBS | TN | Square Head Bolt | Grade 8 | Plain | 1-8 x 5 | 1-8 x 5 square mach bolt gr-8 b18.2.1 | 52 |
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| KBS | TN | Square Head Bolt | Grade 8 | Plain | 1-8 x 15 | 1-8 x 15 square!machbolt gr-8 b18.2.1 | 2 |
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| KBS | TN | Square Head Bolt | Grade 8 | Plain | 1-8 x 3 1/2 | 1-8 x 3 1/2 square mach bolt gr-8 b18.2.1 | 20 |
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| KBS | TN | Square Head Bolt | Grade 8 | Plain | 1-8 x 12 | 1-8 x 12 square mach bolt gr-8 b18.2.1 | 26 |
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| KBS | TN | Square Head Bolt | Steel | Plain | 1-8 x 2 3/4 | 1-8 x 2 3/4 square hd mach.bolt b18.2.1 | 5 |
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| KBS | TN | Square Head Bolt | Grade 8 | Plain | 1 1/8-7 x 10 | 1-1/8-7 x 10 inch square mach bolt gr-8 b18.2.1 | 4 |
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| KBS | TN | Square Head Bolt | Grade 8 | Plain | 1-8 x 6 1/2 | 1-8 x 6 1/2 square!machbolt gr-8 b18.2.1 | 55 |
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| KBS | TN | Square Head Bolt | Grade 8 | Plain | 1-8 x 6 3/4 | 1-8 x 6 3/4 square mach bolt gr-8 b18.2.1 | 10 |
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| KBS | TN | Square Head Bolt | Grade 8 | Plain | 1 1/8-7 x 5 1/2 | 1-1/8-7 x 5 1/2 square!machbolt gr-8 b18.2.1 | 15 |
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| KBS | TN | Square Head Bolt | Grade 5 | Plain | 1-8 x 5 1/2 | 1-8 x 5 1/2 square mach.bolt gr-5 b18.2.1 | 12 |
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| KBS | TN | Square Head Bolt | Grade 8 | Plain | 1-8 x 8 | 1-8 x 8 square!machbolt gr-8 b18.2.1 | 52 |
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| KBS | TN | Square Head Bolt | Grade 5 | Plain | 1 1/4-7 x 14 | 1-1/4-7 x 14 square mach.bolt gr-5 b18.2.1 | 2 |
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| KBS | TN | Square Head Bolt | Grade 8 | Plain | 1 1/4-7 x 4 1/2 | 1-1/4-7 x 4 1/2 square!machbolt gr-8 b18.2.1 | 90 |
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| KBS | TN | Square Head Bolt | Grade 8 | Plain | 1 1/4-7 x 10 | 1-1/4-7 x 10 inch square!machbolt gr-8 b18.2.1 | 26 |
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| KBS | TN | Square Head Bolt | Grade 8 | Plain | 1 1/4-7 x 4 | 1-1/4-7 x 4 square!machbolt gr-8 b18.2.1 | 50 |
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| KBS | TN | Square Head Bolt | Grade 8 | Plain | 1 1/4-7 x 16 | 1-1/4-7 x 16 square!machbolt gr-8 b18.2.1 | 23 |
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| KBS | TN | Square Head Bolt | Grade 8 | Plain | 1 1/4-7 x 12 | 1-1/4-7 x 12 square!machbolt gr-8 b18.2.1 | 10 |
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| KBS | TN | Square Head Bolt | Grade 8 | Plain | 1 1/4-7 x 5 1/2 | 1-1/4-7 x 5 1/2 square!machbolt gr-8 b18.2.1 | 50 |
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| KBS | TN | Square Head Bolt | Grade 5 | Plain | 1 1/4-7 x 4 | 1-1/4-7 x 4 square mach.bolt gr-5 b18.2.1 | 10 |
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| WSB | KY | Square Head Bolt | Steel | Plain | 3/8-16 x 1 1/4 | blt sqr sbrz (pl) 3/8-16x1 1/4 b18.2.1 | 682 |
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| WSB | KY | Square Head Bolt | Steel | Plain | x 2 1/4 | blt sqr si brz (pl) 3/8 16x2 1/4 b18.2.1 | 50 |
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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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| WSB | KY | Square Head Bolt | 300 Stainless (A1,A2, 18-8,304,310 etc.) | Plain | 1/2-13 x 2 | blt sqr (18-8) 1/2-13x2 b18.2.1 | 47 |
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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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| 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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