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5/16-18 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 .
184 results, (click on any line for more information)
| Buy Square Head Bolts from one of our FCH Network Partners | ||||||||
|---|---|---|---|---|---|---|---|---|
| Supplier | Loc | Type | Material | Finish | Size | Description | Qty | |
| Zoro Tools Inc. | Square Head Bolt | Steel | Plain | 5/16-18 | 5/16-18 carbon steel square bolt die |
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| Buy Square Head Bolts from one of our FCH Network Members | ||||||||
| 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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| BHAM | AL | Square Head Bolt | Steel | Plain | 5/16-18 x 1 1/4 | 5/16-18 x 1 1/4 sq hd mach bolt b18.2.1 | 850 |
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| BHAM | AL | Square Head Bolt | Steel | Plain | 5/16-18 x 1 | 5/16-18 x 1 sq hd mach bolt b18.2.1 | 300 |
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| BHAM | AL | Square Head Bolt | Steel | Zinc/Clear | 5/16-18 x 1 1/4 | 5/16-18 x 1 1/4 sq. hd m/b zinc b18.2.1 | 372 |
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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 | 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 | 5/16-18 x 5 | square m/s bolt black | 450 |
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| American | NY | Square Head Bolt | Steel | Plain | 5/16-18 x 5 1/2 | square m/s bolt black | 500 |
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| American | NY | Square Head Bolt | Steel | Zinc/Yellow | 5/16-18 x 1 | square m/s bolt | 170 |
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| Hayes | CA | Square Head Bolt | Steel | Plain | 5/16-18 x 6 | 5/16-18 x 6 square hd bolt pln | 34 |
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| Hayes | CA | Square Head Bolt | Steel | Zinc/Clear | 5/16-18 x 5 1/2 | 5/16-18 x 5 1/2 square hd bolt zinc | 19 |
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| Hayes | CA | Square Head Bolt | Steel | Zinc/Clear | 5/16-18 x 6 | 5/16-18 x 6 square hd bolt zinc | 40 |
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| Hayes | CA | Square Head Bolt | Steel | Plain | 5/16-18 x 3 | 5/16-18 x 3 square hd bolt pln | 752 |
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| Hayes | CA | Square Head Bolt | 300 Stainless (A1,A2, 18-8,304,310 etc.) | Plain | 5/16-18 x 1 1/4 | 5/16-18 x 1 1/4 square hd bolt 18-8ss | 44 |
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| ZAL INDUS | CA | Square Head Bolt | Steel | Zinc/Clear | 5/16-18 x 1 1/2 | 5/16-18 x 1 1/2 sq hd mach bolt grade 2 pltd | 5,000 |
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| ZAL INDUS | CA | Square Head Bolt | Steel | Zinc/Clear | 5/16-18 x 1 1/4 | 5/16-18 x 1 1/4 sq hd mach bolt grade 2 pltd | 2,050 |
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| ZAL INDUS | CA | Square Head Bolt | Steel | Plain | 5/16-18 x 2 1/2 | 5/16-18 x 2 1/2 sq hd mach bolt | 553 |
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| ZAL INDUS | CA | Square Head Bolt | Steel | Zinc/Clear | 5/16-18 x 3/4 | 5/16-18 x 3/4 sq hd mach bolt grade 2 pltd | 100 |
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| QCS | OR | Square Head Bolt | Steel | Zinc/Clear | 5/16-18 x 1 3/8 | 5/16-18 x 1-3/8 square head c/s gold plated | 2200 |
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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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| Cal Fastenrs | CA | Square Head Bolt | Steel | Zinc/Clear | 5/16-18 x 1 | square hd mach bolt square hd bolt | 700 |
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| Cal Fastenrs | CA | Square Head Bolt | Steel | Zinc/Clear | 5/16-18 x 1 1/2 | square hd mach bolt emer excess | 825 |
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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 | Plain | 5/16-18 x 3/4 | bolt square machine | 50 |
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| ACCURATE | IL | Square Head Bolt | Steel | Zinc/Clear | 5/16-18 x 1 1/4 | bolt square machine | 4000 |
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| ACCURATE | IL | Square Head Bolt | Steel | Zinc/Clear | 5/16-18 x 1 1/2 | bolt square machine f/t | 350 |
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| ACCURATE | IL | Square Head Bolt | Steel | Zinc/Clear | 5/16-18 x 1 3/4 | bolt square machine | 300 |
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| ACCURATE | IL | Square Head Bolt | Steel | Zinc/Clear | 5/16-18 x 2 1/2 | bolt square machine | 1550 |
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| ACCURATE | IL | Square Head Bolt | Steel | Plain | 5/16-18 x 4 | bolt square machine | 43 |
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| ACCURATE | IL | Square Head Bolt | Steel | Zinc/Clear | 5/16-18 x 3 | bolt square machine f/t | 5925 |
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| ACCURATE | IL | Square Head Bolt | Steel | Zinc/Clear | 5/16-18 x 3 | bolt square machine | 1265 |
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| ACCURATE | IL | Square Head Bolt | Steel | Zinc/Clear | 5/16-18 x 7 | bolt square machine | 450 |
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| Century | FL | Square Head Bolt | Grade 2 | Plain | 5/16-18 x 3/4 | 5/16-18 x 3/4 square head bolt grade 2 | 1,776 |
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| Century | FL | Square Head Bolt | Steel | Plain | 5/16-18 x 1 1/4 | 5/16-18 x 1 1/4 square hd. bolt | 1800 |
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| Mansco | MI | Square Head Bolt | Steel | Zinc/Clear | 5/16-18 x 1 1/2 | square hd m/b triv znc | 400 |
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| ASMC | IL | Square Head Bolt | Grade A | Zinc/Clear | 5/16-18 x 1 3/4 | 5/16-18x1 3/4 a307 gra square hd machine bolt low carb zp | 1,100 |
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| ASMC | IL | Square Head Bolt | Grade A | Plain | 5/16-18 x 5 | (pt) coarse a307 gra square hd m/b low carb | 150 |
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| ASMC | IL | Square Head Bolt | Grade A | Plain | 5/16-18 x 6 | (pt) coarse a307 gra square hd m/b low carb | 275 |
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| ASMC | IL | Square Head Bolt | Grade A | Plain | 5/16-18 x 3 | (pt) coarse a307 gra square hd m/b low carb | 48 |
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| ASMC | IL | Square Head Bolt | Grade A | Zinc/Clear | 5/16-18 x 3 1/2 | a307 gra square hd m/b low carb zp | 600 |
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| ASMC | IL | Square Head Bolt | Grade A | Galvanized | 5/16-18 x 1 1/4 | a307 gra square hd m/b low carb hdg | 800 |
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| ASMC | IL | Square Head Bolt | Steel | Zinc/Clear | 5/16-18 x 3/4 | coarse square hd m/b low carb zp | 725 |
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| ASMC | IL | Square Head Bolt | Grade A | Galvanized | 5/16-18 x 3/4 | a307 gra square hd m/b low carb hdg b18.2.1 | 1,550 |
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| ASMC | IL | Square Head Bolt | Grade A | Zinc/Clear | 5/16-18 x 1 | a307 gra square hd m/b low carb zp | 650 |
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| ASMC | IL | Square Head Bolt | Grade A | Plain | 5/16-18 x 3 1/2 | (pt) coarse a307 gra square hd m/b low carb | 450 |
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| ASMC | IL | Square Head Bolt | Grade A | Galvanized | 5/16-18 x 1 | a307 gra square hd m/b low carb hdg | 1,180 |
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| ASMC | IL | Square Head Bolt | Grade A | Zinc/Clear | 5/16-18 x 1 1/4 | a307 gra square hd m/b low carb zp | 565 |
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| ASMC | IL | Square Head Bolt | Grade A | Galvanized | 5/16-18 x 2 | a307 gra square hd m/b low carb hdg | 800 |
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| ASMC | IL | Square Head Bolt | Grade A | Galvanized | 5/16-18 x 1 1/2 | a307 gra square hd m/b low carb hdg b18.2.1 | 800 |
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| ASMC | IL | Square Head Bolt | Grade A | Galvanized | 5/16-18 x 2 1/2 | a307 gra square hd m/b low carb hdg b18.2.1 | 450 |
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| Future Fastener | TX | Square Head Bolt | Grade 2 | Galvanized | 5/16-18 x 1 | 5/16-18 x 1 g2 (sq head mch bolt) galv | 581 |
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| Jackson | MS | Square Head Bolt | Grade 2 | Plain | 5/16-18 x 3 | square bolt gr. 2 | 204 |
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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 | 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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| SRF | AL | Square Head Bolt | Grade 2 | Plain | 5/16-18 x 1 | square hd bolt | - |
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| SRF | AL | Square Head Bolt | Grade 2 | Plain | 5/16-18 x 3 1/2 | square hd bolt | - |
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| SRF | AL | Square Head Bolt | Grade 2 | Plain | 5/16-18 x 4 | square hd bolt | - |
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| SRF | AL | Square Head Bolt | Grade 2 | Plain | 5/16-18 x 5 | square hd bolt | 17 |
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| SRF | AL | Square Head Bolt | Grade 2 | Plain | 5/16-18 x 3/4 | square hd bolt | 66 |
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| WDMB | IA | Square Head Bolt | 300 Stainless (A1,A2, 18-8,304,310 etc.) | Plain | 5/16-18 x 1 9/16 | blt u sq (18 8) 5/16-18x1 9/16 drw | 330 |
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| WDMB | IA | Square Head Bolt | 300 Stainless (A1,A2, 18-8,304,310 etc.) | Plain | 5/16-18 x 2 | blt u sq (18 8) 5/16-18x2 drw | 84 |
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| WDMB | IA | Square Head Bolt | Steel | Zinc/Clear | 5/16-18 x 2 | blt u sqr st (zn) 5/16-18x2 drw | 130 |
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| ACF | CA | Square Head Bolt | Grade 2 | Zinc/Clear | 5/16-18 x 3/4 | 5/16-18x3/4 square head bolt gr2 z/p rohs | 360 |
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| Delta | TX | Square Head Bolt | Steel | Zinc/Clear | 5/16-18 x 1 1/2 | square hd bolt | 1512 |
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| Hodell | OH | Square Head Bolt | Steel | Galvanized | 5/16-18 x 1 1/2 | square hd mach bolt hdg | 281 |
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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 | 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 | 5/16-18 x 6 | bolt & c/s square boltsquare b18.2.1 | 4700 |
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| BIG BOLT | IL | Square Head Bolt | 300 Stainless (A1,A2, 18-8,304,310 etc.) | Plain | 5/16-18 x 4 | bolt & c/s square bolt300 (a1 a2 18-8 304 310 etc.)square b18.2.1 | 1500 |
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| BIG BOLT | IL | Square Head Bolt | Grade 5 | Plain | 5/16-18 x 2 | bolt & c/s square boltsquare b18.2.1 | 5000 |
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| BIG BOLT | IL | Square Head Bolt | Steel | Plain | 5/16-18 x 14 | bolt & c/s square boltsquare b18.2.1 | 500 |
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| BIG BOLT | IL | Square Head Bolt | 300 Stainless (A1,A2, 18-8,304,310 etc.) | Plain | 5/16-18 x 6 | bolt & c/s square bolt300 (a1 a2 18-8 304 310 etc.)square b18.2.1 | 500 |
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| BIG BOLT | IL | Square Head Bolt | Grade 5 | Plain | 5/16-18 x 3/4 | bolt & c/s square boltsquare b18.2.1 | 5500 |
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| BIG BOLT | IL | Square Head Bolt | Grade 5 | Plain | 5/16-18 x 4 | bolt & c/s square boltsquare b18.2.1 | 34100 |
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| BIG BOLT | IL | Square Head Bolt | Grade 5 | Plain | 5/16-18 x 1 | bolt & c/s square boltsquare b18.2.1 | 5000 |
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| BIG BOLT | IL | Square Head Bolt | Steel | Plain | 5/16-18 x 16 | bolt & c/s square boltsquare b18.2.1 | 1000 |
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| BIG BOLT | IL | Square Head Bolt | Steel | Plain | 5/16-18 x 12 | bolt & c/s square boltsquare b18.2.1 | 1000 |
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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 | bolt & c/s square bolt300 (a1 a2 18-8 304 310 etc.)square b18.2.1 | 500 |
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| BIG BOLT | IL | Square Head Bolt | Grade 8 | Zinc/Clear | 5/16-18 x 2 3/4 | bolt & c/s square boltsquare b18.2.1 | 1580 |
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| BIG BOLT | IL | Square Head Bolt | Grade 5 | Plain | 5/16-18 x 3 | bolt & c/s square boltsquare b18.2.1 | 2900 |
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| BIG BOLT | IL | Square Head Bolt | Steel | Plain | 5/16-18 x 10 | bolt & c/s square boltsquare b18.2.1 | 1000 |
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| ASMC | IL | Square Head Bolt | Grade A | Plain | 5/16-18 x 1 | (ft) coarse a307 gra square hd m/b low carb | 150 |
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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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| Palmer Bolt | OH | Square Head Bolt | Steel | Zinc/Clear | 5/16-18 x 1 3/8 | square mach bolt | 1,272 |
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| MidStates | MI | Square Head Bolt | Grade 2 | Plain | 5/16-18 x 4 1/2 | 5/16-18 x 4 1/2 square hd bolt gr 2 pln | 272 |
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| KBS | TN | Square Head Bolt | Steel | Plain | 5/16-18 x 1 1/2 | 5/16-18 x 1 1/2 square hd mach.bolt b18.2.1 | 220 |
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| THRDFAST | MS | Square Head Bolt | Steel | Plain | 5/16-18 x 2 1/4 | square hd bolt b18.2.1 | 80 |
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| THRDFAST | MS | Square Head Bolt | Steel | Plain | 5/16-18 x 2 1/2 | square hd bolt b18.2.1 | 100 |
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| THRDFAST | MS | Square Head Bolt | Steel | Plain | 5/16-18 x 3/4 | square hd bolt b18.2.1 | 80 |
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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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| Liberty | IL | Square Head Bolt | Steel | Zinc/Clear | 5/16-18 x 4 | square m/b f/t m/b f/tead | 450 |
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| Liberty | IL | Square Head Bolt | Steel | Zinc/Clear | 5/16-18 x 2 1/2 | square m/b machine bolt | 2,350 |
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| Liberty | IL | Square Head Bolt | Steel | Zinc/Clear | 5/16-18 x 4 | square m/b machine bolt | 205 |
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| Liberty | IL | Square Head Bolt | Grade 5 | Zinc/Yellow | 5/16-18 x 3/4 | square m/b | 500 |
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| Liberty | IL | Square Head Bolt | Steel | Zinc/Clear | 5/16-18 x 1 1/2 | square bolt | 900 |
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| Liberty | IL | Square Head Bolt | Steel | Plain | 5/16-18 x 3 1/2 | square hd m/b 7/8 tl 7/8 tl | 500 |
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| Liberty | IL | Square Head Bolt | Steel | Plain | 5/16-18 x 4 1/2 | 5/16-18x4-1/2 square m/b 1 5/6 tl m/b 1 5/6 tl | 180 |
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| Liberty | IL | Square Head Bolt | 300 Stainless (A1,A2, 18-8,304,310 etc.) | Plain | 5/16-18 x 2 1/2 | square m/b 18-8 st m/b 18-8 st | 40 |
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| Liberty | IL | Square Head Bolt | Steel | Plain | 5/16-18 x 10 | square m/b machine bolt | 173 |
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| ISSCO | MO | Square Head Bolt | Grade 2 | Plain | 5/16-18 x 2 1/2 | 895 |
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| ISSCO | MO | Square Head Bolt | Grade 2 | Plain | 5/16-18 x 3 | 1060 |
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| GUIDON | NJ | Square Head Bolt | Steel | Tin | 5/16-18 x 1 | 5/16-18 X 1 SQUARE HEAD BATTERY BOLT, TIN ZINC PER GMW 3200 | 18,000 |
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| AFI | FL | Square Head Bolt | Steel | Plain | 5/16-18 x 1 | 5/16-18x1 sq hd bolt st | 4760 |
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| ASMC | IL | Square Head Bolt | Grade A | Plain | 5/16-18 x 2 1/2 | (pt) coarse a307 gra square hd m/b low carb | 100 |
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| XL Screw | GA | Square Head Bolt | Steel | Plain | 5/16-18 x 1 3/4 | f/t square hd m/b astm a307 | 800 |
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| XL Screw | GA | Square Head Bolt | Steel | Plain | 5/16-18 x 1 1/4 | f/t square hd m/b astm a307 | 1,100 |
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| XL Screw | GA | Square Head Bolt | Steel | Plain | 5/16-18 x 3 | f/t square hd m/b astm a307 | 500 |
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| XL Screw | GA | Square Head Bolt | Steel | Plain | 5/16-18 x 1 | f/t square hd m/b astm a307 | 1,300 |
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| XL Screw | GA | Square Head Bolt | Steel | Plain | 5/16-18 x 4 | f/t square hd m/b astm a307 | 400 |
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| XL Screw | GA | Square Head Bolt | Steel | Plain | 5/16-18 x 3/4 | f/t square hd m/b astm a307 | 1,500 |
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| XL Screw | GA | Square Head Bolt | Steel | Plain | 5/16-18 x 2 | f/t square hd m/b astm a307 | 700 |
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| XL Screw | GA | Square Head Bolt | Steel | Plain | 5/16-18 x 1 1/2 | f/t square hd m/b astm a307 | 1,000 |
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| XL Screw | GA | Square Head Bolt | Steel | Plain | 5/16-18 x 2 1/2 | f/t square hd m/b astm a307 | 600 |
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| XL Screw | GA | Square Head Bolt | Steel | Plain | 5/16-18 x 1 1/4 | square m/b std thrd fsb astm a307 | 1,100 |
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| XL Screw | GA | Square Head Bolt | Steel | Plain | 5/16-18 x 1 3/4 | square m/b std thrd fsb astm a307 | 800 |
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| XL Screw | GA | Square Head Bolt | Steel | Plain | 5/16-18 x 2 | square m/b std thrd fsb astm a307 | 700 |
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| XL Screw | GA | Square Head Bolt | Steel | Plain | 5/16-18 x 3 | square m/b std thrd fsb astm a307 | 500 |
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| XL Screw | GA | Square Head Bolt | Steel | Plain | 5/16-18 x 6 | square m/b std thrd fsb astm a307 | 300 |
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| XL Screw | GA | Square Head Bolt | Steel | Plain | 5/16-18 x 4 | square m/b std thrd fsb astm a307 | 400 |
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| XL Screw | GA | Square Head Bolt | Steel | Plain | 5/16-18 x 5 | square m/b std thrd fsb astm a307 | 350 |
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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 | 200 |
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| ASMC | IL | Grade A | Plain | 5/16-18 x 1 1/4 | (ft) coarse a307 gra square hd m/b low carb | 46 |
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| ASMC | IL | Square Head Bolt | Grade A | Plain | 5/16-18 x 1 3/4 | (pt) coarse a307 gra square hd m/b low carb | 50 |
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| MasFasCorp | NV | Square Head Bolt | Grade 2 | Plain | 5/16-18 x 2 1/2 | square bolt | inquire |
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| Kanebridge | IL | Square Head Bolt | Steel | Plain | 5/16-18 x 3/4 | 5/16-18x3/4 square machine bolt plain | 20,000 |
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| Kanebridge | IL | Square Head Bolt | Steel | Plain | 5/16-18 x 1 | 5/16-18x1 square machine bolt plain | 20,000 |
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| Kanebridge | IL | Square Head Bolt | Steel | Plain | 5/16-18 x 1 1/4 | 5/16-18x1 1/4 square machine bolt plain | 17.500 |
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| Kanebridge | IL | Square Head Bolt | Steel | Plain | 5/16-18 x 1 1/2 | 5/16-18x1 1/2 square machine bolt plain | 15,000 |
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| Kanebridge | IL | Square Head Bolt | Steel | Plain | 5/16-18 x 2 | 5/16-18x2 square machine bolt plain | 12.500 |
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| Kanebridge | IL | Square Head Bolt | Steel | Plain | 5/16-18 x 2 1/2 | 5/16-18x2 1/2 square machine bolt plain | 12.500 |
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| Kanebridge | IL | Square Head Bolt | Steel | Plain | 5/16-18 x 3 | 5/16-18x3 square machine bolt plain | 10,000 |
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| Kanebridge | IL | Square Head Bolt | Steel | Plain | 5/16-18 x 3 1/4 | 5/16-18x3 1/4 square machine bolt plain | 7.500 |
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| Kanebridge | IL | Square Head Bolt | Steel | Plain | 5/16-18 x 4 | 5/16-18x4 square machine bolt plain | 7.500 |
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| Delta Secondary | IL | Square Head Bolt | Grade 2 | Plain | 5/16-18 x 5/8 | 41500 |
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| Delta Secondary | IL | Square Head Bolt | Grade 2 | Plain | 5/16-18 x 1 | 3190 |
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| FasSpcMfg | FL | Square Head Bolt | 316, 317, A4 Stainless | Plain | 5/16-18 x 1 1/2 | square m/b 316 stainless | 1 |
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| FasSpcMfg | FL | Square Head Bolt | 316, 317, A4 Stainless | Plain | 5/16-18 x 2 | square m/b 316 stainless | 2 |
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| Valley Nu | WA | Square Head Bolt | Steel | Plain | 5/16-18 x 6 | nc square bolt pl | 9 |
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| Valley Nu | WA | Square Head Bolt | Steel | Plain | 5/16-18 x 2 3/4 | nc square bolt pl | 8 |
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| Valley Nu | WA | Square Head Bolt | Steel | Plain | 5/16-18 x 5 | nc square bolt pl | 12 |
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| Valley Nu | WA | Square Head Bolt | Steel | Plain | 5/16-18 x 3 | nc square bolt pl | 12 |
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| Valley Nu | WA | Square Head Bolt | Steel | Plain | 5/16-18 x 5 1/2 | nc square bolt pl | 11 |
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| Valley Nu | WA | Square Head Bolt | Steel | Plain | 5/16-18 x 4 | nc square bolt pl | 4 |
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| Valley Nu | WA | Square Head Bolt | Steel | Plain | 5/16-18 x 2 1/2 | nc square bolt pl | 1 |
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| Alma Bolt | MI | Square Head Bolt | Grade 2 | Plain | 5/16-18 x 2 1/2 | square bolt | 479 |
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| Alma Bolt | MI | Square Head Bolt | Grade 2 | Plain | 5/16-18 x 3/4 | square bolt | 1313 |
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| Alma Bolt | MI | Square Head Bolt | Grade 2 | Plain | 5/16-18 x 1 1/2 | square bolt | 757 |
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| Alma Bolt | MI | Square Head Bolt | Grade 2 | Plain | 5/16-18 x 1 | square bolt | 1086 |
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| Alma Bolt | MI | Square Head Bolt | Grade 2 | Plain | 5/16-18 x 1 1/4 | square bolt | 914 |
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| ACCURATE | IL | Square Head Bolt | Steel | Zinc/Clear | 5/16-18 x 6 1/2 | square m/b | 25 |
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| ACCURATE | IL | Square Head Bolt | Steel | Zinc/Clear | 5/16-18 x 1 3/4 | square m/b | 3,000 |
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| ACCURATE | IL | Square Head Bolt | Steel | Zinc/Clear | 5/16-18 x 3 | square m/b | 300 |
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| ACCURATE | IL | Square Head Bolt | Steel | Zinc/Clear | 5/16-18 x 5 1/2 | square m/b | 600 |
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| ACCURATE | IL | Square Head Bolt | Steel | Zinc/Clear | 5/16-18 x 3 1/2 | square m/b | 5,000 |
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| ACCURATE | IL | Square Head Bolt | Steel | Zinc/Clear | 5/16-18 x 2 1/4 | square m/b | 1,600 |
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| ACCURATE | IL | Square Head Bolt | Steel | Zinc/Clear | 5/16-18 x 7 | square m/b | 916 |
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| ACCURATE | IL | Square Head Bolt | Steel | Zinc/Clear | 5/16-18 x 6 | square m/b | 300 |
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| ACCURATE | IL | Square Head Bolt | Steel | Zinc/Clear | 5/16-18 x 5 | square m/b | 1,000 |
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| ACCURATE | IL | Square Head Bolt | Steel | Zinc/Clear | 5/16-18 x 2 1/2 | square m/b | 1,200 |
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| ACCURATE | IL | Square Head Bolt | Steel | Zinc/Clear | 5/16-18 x 1 | square m/b | 22,000 |
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| ACCURATE | IL | Square Head Bolt | Steel | Zinc/Clear | 5/16-18 x 3 | square fulthr m/b | 3,000 |
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| ACCURATE | IL | Square Head Bolt | Steel | Zinc/Clear | 5/16-18 x 4 1/4 | square m/b | 1,200 |
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| ACCURATE | IL | Square Head Bolt | Steel | Zinc/Clear | 5/16-18 x 1 1/4 | square m/b | 5,000 |
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| ACCURATE | IL | Square Head Bolt | Steel | Zinc/Clear | 5/16-18 x 1 1/2 | square fulthr m/b | 1,000 |
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| ACCURATE | IL | Square Head Bolt | Steel | Zinc/Clear | 5/16-18 x 4 1/2 | square m/b | 200 |
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| AALL | NJ | Square Head Bolt | Steel | Plain | 5/16-18 x 1 1/4 | square m/b, | 50 |
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| QFS | MI | Square Head Bolt | 300 Stainless (A1,A2, 18-8,304,310 etc.) | Plain | 5/16-18 x 2 | Square head set screw cup point STAINLESS STEEL | 150 |
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