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1 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 .
133 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 | Grade 8 | Plain | 1-8 x 16 | bolt & c/s square boltsquare b18.2.1 | 150 |
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| BIG BOLT | IL | Square Head Bolt | Grade 5 | Plain | 1-8 x 16 | bolt & c/s square boltsquare b18.2.1 | 400 |
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| B & K FAST | PA | Square Head Bolt | 300 Stainless (A1,A2, 18-8,304,310 etc.) | Plain | 1-8 x 18 | 1-8 x 18 square bolts t-304 stainless b18.2.1 | 1 |
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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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| BIG BOLT | IL | Square Head Bolt | Grade 5 | Plain | 1-14 x 18 | bolt & c/s square boltb18.2.1 | 400 |
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| FMP | MA | Square Head Bolt | Steel | Plain | 1-8 x 2 | square bolt | 4 |
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| Hayes | CA | Square Head Bolt | Steel | Zinc/Clear | 1-8 x 2 | 1-8 x 2 square hd bolt zinc | 58 |
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| THRDFAST | AL | Square Head Bolt | Steel | Galvanized | 1-8 x 20 | square hd bolt hdg b18.2.1 | 19 |
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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 | 1-14 x 20 | bolt & c/s square boltb18.2.1 | 400 |
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| BIG BOLT | IL | Square Head Bolt | Grade 8 | Plain | 1-8 x 20 | bolt & c/s square boltsquare b18.2.1 | 150 |
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| FMP | MA | Square Head Bolt | Steel | Plain | 1-8 x 2 1/2 | square bolt | 28 |
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| ACCURATE | IL | Square Head Bolt | Steel | Plain | 1-8 x 2 1/2 | square m/b | 35 |
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| ASFCORP | MI | Square Head Bolt | Grade A | Plain | 1-8 x 2 1/2 | 1-8 x 2 1/2 sq hd blt a307 gr a pkg | 10 |
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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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| 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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| THRDFAST | AL | Square Head Bolt | Steel | Galvanized | 1-8 x 28 | square hd bolt hdg b18.2.1 | 4 |
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| Valley Nu | WA | Square Head Bolt | Steel | Galvanized | 1-8 x 3 | nc square bolt hdg | 20 |
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| XL Screw | GA | Square Head Bolt | Steel | Plain | 1-8 x 3 | square m/b std thrd fsb astm a307 | 50 |
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| ACCURATE | IL | Square Head Bolt | Steel | Plain | 1-8 x 3 | square m/b | 65 |
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| SWACO | OH | Square Head Bolt | Grade A | Plain | 1-8 x 3 | 1-8x3 a307 gr a square hd bolt pln | 40 |
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| BIG BOLT | IL | Square Head Bolt | Grade 5 | Plain | 1-14 x 30 | bolt & c/s square boltb18.2.1 | 400 |
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| Jackson | MS | Square Head Bolt | Grade 5 | Plain | 1-8 x 3 1/2 | square | 25 |
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| B & K FAST | PA | Square Head Bolt | Grade 8 | Plain | 1-8 x 3 1/2 | 1-8 x 3 1/2 square bolts gr 8 plain b18.2.1 | 2 |
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| B & K FAST | PA | Square Head Bolt | Steel | Plain | 1-8 x 3 1/2 | 1-8 x 3 1/2 square bolts plain b18.2.1 | 305 |
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| CIF | IL | Square Head Bolt | 300 Stainless (A1,A2, 18-8,304,310 etc.) | Plain | 1-8 x 3 1/2 | 1-8x3 1/2 square head machine bolt 18-8 s/s steel (3) (3) (3) () | 3 |
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| CIF | IL | Square Head Bolt | Grade 2 | Plain | 1-8 x 3 1/2 | 1-8x3 1/2 square head machine bolt grade 2 plain (58) (58) (58) () | 58 |
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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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| Liberty | IL | Square Head Bolt | Steel | Zinc/Yellow | 1-8 x 3 1/2 | square m/b & machine bolt & | 50 |
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| XL Screw | GA | Square Head Bolt | Steel | Plain | 1-8 x 3 1/2 | square m/b std thrd fsb astm a307 | 40 |
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| American | NY | Square Head Bolt | Steel | Plain | 1-8 x 3 3/4 | square m/b | 50 |
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| MastBolt | OH | Square Head Bolt | Grade 5 | Plain | 1 x 3 3/4 | 1 x 3-3/4 gr.5 square head thin hd with standard thread dr@3-3/8 w/9/32 hole | 1000 |
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| MastBolt | OH | Square Head Bolt | Grade 5 | Plain | 1 x 3 3/4 | 1 x 3-3/4 gr.5 square head thin hd with standard thread dr@3-3/8 w/9/32 hole | 1000 pcs |
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| MastBolt | OH | Square Head Bolt | Grade 5 | Plain | 1 x 3 3/4 | 1 x 3-3/4 gr.5 square head thin hd with standard thread dr@3-3/8 w/9/32 hole | 1000 pcs |
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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 | 3 |
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| Endries | WI | Square Head Bolt | Steel | Zinc/Clear | 1-8 x 4 | 1-8x4 square head machine bolt zinc | 105 |
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| BHAM | AL | Square Head Bolt | Grade 8 | Plain | 1-8 x 4 | square hd m/b | 12 |
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| MastBolt | OH | Square Head Bolt | Grade 8 | Plain | 1 x 4 | 1 x 4 square head switch bolt gr.8 with 2-1/4 thread | 45 pcs |
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| Jackson | MS | Square Head Bolt | Grade 5 | Plain | 1-8 x 4 | square | 25 |
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| THRDFAST | AL | Square Head Bolt | Steel | Galvanized | 1-8 x 4 | square hd bolt hdg b18.2.1 | 13 |
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| MastBolt | OH | Square Head Bolt | Grade 8 | Plain | 1 x 4 | 1 x 4 square head switch bolt gr.8 with 2-1/4 thread | 45 |
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| XL Screw | GA | Square Head Bolt | Steel | Plain | 1-8 x 4 | square m/b std thrd fsb astm a307 | 40 |
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| Arden | WI | Square Head Bolt | Grade 2 | Zinc/Clear | 1-8 x 4 | 1-8x4 square hd bolt gr2 zc | inquire |
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| United St | IL | Square Head Bolt | Grade 5 | Plain | 1-8 x 4 1/4 | square thin head | 1,885 |
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| United St | IL | Square Head Bolt | Grade 8 | Plain | 1-8 x 4 1/4 x 3 7/8 | square head | 392 |
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| Valley Nu | WA | Square Head Bolt | Grade 8 | Plain | 1-8 x 4 1/2 | nc gr8 square hd bolt | 10 |
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| ISSCO | MO | Square Head Bolt | Grade 8 | Plain | 1-14 x 4 1/2 | 52 |
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| XL Screw | GA | Square Head Bolt | Steel | Plain | 1-8 x 4 1/2 | square m/b std thrd fsb astm a307 | 35 |
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| ACCURATE | IL | Square Head Bolt | Steel | Plain | 1-8 x 4 1/2 | square m/b | 100 |
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| Northern | MN | Square Head Bolt | Steel | Plain | 1-8 x 4 1/2 | 1-8x4-1/2 #5 square hd bolt | 130 |
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| Bostwick | IN | Square Head Bolt | Grade 8 | Plain | 1-14 x 4 1/2 | 1-14 x 4-1/2 square head bolt grade 8 b18.2.1 | 12 |
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| United St | IL | Square Head Bolt | Grade 5 | Plain | 1-8 x 4 3/4 | square head dr 4-1/4 | 521 |
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| BIG BOLT | IL | Square Head Bolt | Grade 5 | Plain | 1-14 x 4 3/4 | bolt & c/s square boltb18.2.1 | 1350 |
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| ACCURATE | IL | Square Head Bolt | Steel | Plain | 1-8 x 5 | bolt square machine | 30 |
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| B & K FAST | PA | Square Head Bolt | Grade 5 | Plain | 1-8 x 5 | 1-8 x 5 square bolt gr 5 plain b18.2.1 | 12 |
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| B & K FAST | PA | Square Head Bolt | Steel | Plain | 1-8 x 5 | 1-8 x 5 square bolts plain b18.2.1 | 295 |
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| OBRIEN | OH | Square Head Bolt | Steel | Plain | 1-8 x 5 | square hd bolt | 15 |
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| ISSCO | MO | Square Head Bolt | Grade 2 | Plain | 1-8 x 5 | 90 |
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| THRDFAST | AL | Square Head Bolt | Steel | Galvanized | 1-8 x 5 | square hd bolt hdg b18.2.1 | 58 |
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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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| XL Screw | GA | Square Head Bolt | Steel | Plain | 1-8 x 5 | square m/b std thrd fsb astm a307 | 35 |
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| ACCURATE | IL | Square Head Bolt | Steel | Plain | 1-8 x 5 | square m/b | 100 |
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| Bostwick | IN | Square Head Bolt | Grade 8 | Plain | 1-14 x 5 | 1-14 x 5 square head bolt grade 8 b18.2.1 | 30 |
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| MastBolt | OH | Square Head Bolt | Grade 5 | Plain | 1 x 5 3/8 | 1 x 5-3/8 thin head gr 5 heat treated with 2-1/2 thread dr.@ 4-5/8 an 4-7/8 w/9/32 hole | 400 |
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| ACCURATE | IL | Square Head Bolt | Steel | Plain | 1-8 x 5 1/2 | bolt square machine | 18 |
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| Purchase | MO | Square Head Bolt | Grade A | Plain | 1-8 x 5 1/2 | 1-8 x 5 1/2 square machine bolt 307a plain | 10 |
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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 5 1/2 | 1-8 x 5 1/2 square mach bolt gr-8 b18.2.1 | 40 |
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| XL Screw | GA | Square Head Bolt | Steel | Plain | 1-8 x 5 1/2 | square m/b std thrd fsb astm a307 | 30 |
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| ACCURATE | IL | Square Head Bolt | Steel | Plain | 1-8 x 5 1/2 | square m/b | 50 |
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| Hayes | CA | Square Head Bolt | Steel | Plain | 1-8 x 5 1/2 | 1-8 x 5 1/2 square hd bolt pln | 8 |
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| Valley Nu | WA | Square Head Bolt | Grade A36 | Galvanized | 1-8 x 5 1/2 | f1554 gr36 sq bolt 5nc hdg | 46 |
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| American | NY | Square Head Bolt | Steel | Plain | 1-8 x 6 | square m/b | 100 |
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| ACCURATE | IL | Square Head Bolt | Steel | Plain | 1-8 x 6 | bolt square machine | 18 |
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| ISSCO | MO | Square Head Bolt | Grade 8 | Plain | 1-14 x 6 | 21 |
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| SRF | AL | Square Head Bolt | Grade 5 | Plain | 1-8 x 6 | square hd bolt | 3 |
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| SIS | AZ | Square Head Bolt | Steel | Plain | 1-8 x 6 | square bolt | 15 |
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| J&L | IN | Square Head Bolt | Grade B7 | Plain | 1-8 x 6 | b7 square hd m/b | 48 |
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| MidStates | MI | Square Head Bolt | Grade 5 | Plain | 1-8 x 6 | 80 |
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| ASMC | IL | Square Head Bolt | Grade A | Plain | 1-8 x 6 | (pt) coarse a307 gra square hd m/b low carb | 20 |
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| Kanebridge | IL | Square Head Bolt | Steel | Plain | 1-8 x 6 | 1-8x6 square machine bolt plain | 0.500 |
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| JET Indus | WI | Square Head Bolt | Grade B7 | Cadmium | 1-8 x 6 | b7 square head bolt 1-8x6 cadmium plated | 8 |
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| XL Screw | GA | Square Head Bolt | Steel | Plain | 1-8 x 6 | square m/b std thrd fsb astm a307 | 30 |
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| ACCURATE | IL | Square Head Bolt | Steel | Plain | 1-8 x 6 | square m/b | 250 |
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| NutsBolts | NE | Square Head Bolt | Grade B7 | Plain | 1-8 x 6 | 1-8x6 a193-b7 sq head machine bolt |
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| ACCURATE | IL | Square Head Bolt | Steel | Plain | 1-8 x 6 1/2 | bolt square machine | 14 |
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| ISSCO | MO | Square Head Bolt | Grade 2 | Plain | 1-14 x 6 1/2 | 32 |
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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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| XL Screw | GA | Square Head Bolt | Steel | Plain | 1-8 x 6 1/2 | square m/b std thrd fsb astm a307 | 25 |
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| ACCURATE | IL | Square Head Bolt | Steel | Plain | 1-8 x 6 1/2 | square m/b | 30 |
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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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| ACCURATE | IL | Square Head Bolt | Steel | Plain | 1-8 x 7 | bolt square machine | 67 |
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| SRF | AL | Square Head Bolt | Grade 8 | Plain | 1-8 x 7 | square hd bolt | 4 |
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| Kanebridge | IL | Square Head Bolt | Steel | Plain | 1-8 x 7 | 1-8x7 square machine bolt plain | 0.250 |
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| Liberty | IL | Square Head Bolt | 300 Stainless (A1,A2, 18-8,304,310 etc.) | Plain | 1-8 x 7 | square machine bo lt 304s/s lt 304s/s | 4 |
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| XL Screw | GA | Square Head Bolt | Steel | Plain | 1-8 x 7 | square m/b std thrd fsb astm a307 | 25 |
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| ACCURATE | IL | Square Head Bolt | Steel | Plain | 1-8 x 7 | square m/b | 90 |
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| OSSCO | RI | Square Head Bolt | Steel | Plain | 1-8 x 7 | 1-8x7 square hd mach bolt b18.2.1 | 3 |
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| ISSCO | MO | Square Head Bolt | Grade 2 | Plain | 1-8 x 7 1/2 | 105 |
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| MidStates | MI | Square Head Bolt | Grade 2 | Plain | 1-8 x 7 1/2 | 1-8 x 7 1/2 square hd bolt gr 2 pln | 4 |
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| American | NY | Square Head Bolt | Steel | Plain | 1-8 x 8 | square m/b black | 60 |
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| ACCURATE | IL | Square Head Bolt | Steel | Plain | 1-8 x 8 | bolt square machine | 28 |
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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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| Jackson | MS | Square Head Bolt | Grade 5 | Plain | 1-8 x 8 | square | 2 |
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| FastWare | Sask | Square Head Bolt | Grade 8 | Zinc/Yellow | 1-8 x 8 | nc square m/b | 39 |
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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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| BIG BOLT | IL | Square Head Bolt | Grade 5 | Plain | 1-8 x 8 | bolt & c/s square boltsquare b18.2.1 | 750 |
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| BIG BOLT | IL | Square Head Bolt | Grade 8 | Plain | 1-8 x 8 | bolt & c/s square boltsquare b18.2.1 | 350 |
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| XL Screw | GA | Square Head Bolt | Steel | Plain | 1-8 x 8 | square m/b std thrd fsb astm a307 | 20 |
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| SWACO | OH | Square Head Bolt | Grade A | Plain | 1-8 x 8 | 1-8x8 a307 gr a square hd bolt pln | 14 |
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| CIF | IL | Square Head Bolt | Grade 5 | Plain | 1-8 x 8 1/2 | 1-8x8 1/2 square head machine bolt grade 5 plain (4) (4) | 4 |
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| ACCURATE | IL | Square Head Bolt | Steel | Plain | 1-8 x 8 1/2 | square m/b | 70 |
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| Kanebridge | IL | Square Head Bolt | Steel | Plain | 1-8 x 9 | 1-8x9 square machine bolt plain | 0.500 |
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| ACCURATE | IL | Square Head Bolt | Steel | Plain | 1-8 x 10 | bolt square machine | 44 |
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| NutsBolts | NE | Square Head Bolt | Grade B7 | Plain | 1-8 x 10 | 1-8 x 10 a193-b7 sq head machine bolt | 33 |
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| BIG BOLT | IL | Square Head Bolt | Grade 5 | Plain | 1-8 x 10 | bolt & c/s square boltsquare b18.2.1 | 930 |
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| Kanebridge | IL | Square Head Bolt | Steel | Plain | 1-8 x 10 | 1-8x10 square machine bolt plain | 0.250 |
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| XL Screw | GA | Square Head Bolt | Steel | Plain | 1-8 x 10 | square m/b std thrd fsb astm a307 | 20 |
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| ACCURATE | IL | Square Head Bolt | Steel | Plain | 1-8 x 10 | square m/b | 60 |
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| NutsBolts | NE | Square Head Bolt | Grade B7 | Plain | 1-8 x 11 | 1-8x11 b7 sq head bolt plain a193 5 thread | 3 |
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| THRDFAST | AL | Square Head Bolt | Steel | Galvanized | 1-8 x 12 | square hd bolt rt6 hdg b18.2.1 | stock |
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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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| BIG BOLT | IL | Square Head Bolt | Grade 8 | Plain | 1-8 x 12 | bolt & c/s square boltsquare b18.2.1 | 200 |
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| XL Screw | GA | Square Head Bolt | Steel | Plain | 1-8 x 12 | square m/b std thrd fsb astm a307 | 15 |
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| ACCURATE | IL | Square Head Bolt | Steel | Plain | 1-8 x 12 | square m/b | 50 |
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| Valley Nu | WA | Square Head Bolt | Steel | Plain | 1-8 x 12 | nc square bolt pl | 6 |
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| Jackson | MS | Square Head Bolt | Grade 5 | Plain | 1-8 x 13 | square | 2 |
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| BIG BOLT | IL | Square Head Bolt | Grade 5 | Plain | 1-14 x 14 | bolt & c/s square boltb18.2.1 | 400 |
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| ACCURATE | IL | Square Head Bolt | Steel | Plain | 1-8 x 15 | bolt square machine | 20 |
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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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| ACCURATE | IL | Square Head Bolt | Steel | Plain | 1-8 x 15 | square m/b | 55 |
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| Jackson | MS | Square Head Bolt | Grade 5 | Plain | 1-8 x 11 square head grade 5 plain | 2 |
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| Jackson | MS | Square Head Bolt | Grade 5 | Plain | 1-8 x 12 square head grade 5 plain | 3 |
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