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4 inch length 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 .
136 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 | |
| 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 | 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 4 | 3/4-10 x 4 square hd bolt | 35 |
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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 | Steel | Plain | 1/2-13 x 4 | square bolt finish | 163 |
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| Mansco | MI | Square Head Bolt | Grade 8 | Plain | 1/2-13 x 4 | square hd m/b gr8 25/box | 26 |
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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 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 2 | Plain | 5/8-11 x 4 | square bolt gr. 2 | 51 |
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| Jackson | MS | Square Head Bolt | Grade 5 | Plain | 1-8 x 4 | square | 25 |
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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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| GLF | OH | Square Head Bolt | Steel | Plain | 3/4-10 x 4 | 3/4-10x4 square hd bolt stl pln b18.2.1 () () () | 53 |
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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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| SunPack | FL | Square Head Bolt | Grade A | Zinc/Clear | 3/4-10 x 4 | 3/4-10x4 a307 square head bolt pt zinc | 30 |
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| Hayes | CA | Square Head Bolt | Steel | Plain | 3/4-10 x 4 | 3/4-10 x 4 square hd bolt pln | 3 |
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| Hayes | CA | Square Head Bolt | Steel | Galvanized | 1/2-13 x 4 | 1/2-13 x 4 square hd bolt hdg | 4 |
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| Hayes | CA | Square Head Bolt | Steel | Zinc/Clear | 1/2-13 x 4 | 1/2-13 x 4 square hd bolt zinc | 19 |
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| Cal Fastenrs | CA | Square Head Bolt | Steel | Plain | 1/2-13 x 4 | square hd mach bolt square uare head | 100 |
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| ASMC | IL | Square Head Bolt | Grade A | Galvanized | 3/8-16 x 4 | a307 gra square hd m/b low carb hdg b18.2.1 | 275 |
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| ASMC | IL | Square Head Bolt | Grade A | Zinc/Clear | 7/8-9 x 4 | a307 gra square hd m/b low carb zp b18.2.1 | 24 |
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| ASMC | IL | Square Head Bolt | Grade A | Galvanized | 7/8-9 x 4 | a307 gra square hd m/b low carb hdg | 19 |
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| ASMC | IL | Square Head Bolt | Grade A | Plain | 3/4-10 x 4 | (pt) coarse a307 gra square hd m/b low carb | 61 |
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| ASMC | IL | Square Head Bolt | Grade A | Zinc/Clear | 1/4-20 x 4 | 1/4-20x4 a307 gra square hd machine bolt low carb zp | 600 |
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| ASMC | IL | Square Head Bolt | Grade A | Plain | 5/8-11 x 4 | (pt) coarse a307 gra square hd m/b low carb | 105 |
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| ASMC | IL | Square Head Bolt | Grade A | Galvanized | 1/4-20 x 4 | a307 gra square hd m/b low carb hdg b18.2.1 | 500 |
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| ASMC | IL | Square Head Bolt | Grade A | Zinc/Clear | 3/4-10 x 4 | a307 gra square hd m/b low carb zp b18.2.1 | 40 |
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| ASMC | IL | Square Head Bolt | Grade A | Plain | 3/8-16 x 4 | (pt) coarse a307 gra square hd m/b low carb b18.2.1 | 150 |
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| Endries | WI | Square Head Bolt | Grade A | Plain | 5/8-11x4 a307 grade a square head machine bolt plain | 108 |
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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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| MTP | CA | Square Head Bolt | Steel | Plain | 5/8 x 4 | 5/8 x 4 a307-gr.a pln square head bolt | stock |
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| ACCURATE | IL | Square Head Bolt | Steel | Plain | 7/8-9 x 4 | 7/8-9x4 bolt square machine plain | 26 |
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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 | Plain | 1/2-13 x 4 | bolt square machine | 848 |
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| ACCURATE | IL | Square Head Bolt | Steel | Plain | 3/4-10 x 4 | bolt square machine | 133 |
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| ACCURATE | IL | Square Head Bolt | Steel | Plain | 3/8-16 x 4 | bolt square machine | 17 |
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| ACCURATE | IL | Square Head Bolt | Steel | Zinc/Clear | 5/8-11 x 4 | bolt square machine | 489 |
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| ACCURATE | IL | Square Head Bolt | Steel | Plain | 1 1/8-7 x 4 | bolt square machine | 140 |
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| ACCURATE | IL | Square Head Bolt | Steel | Plain | 1 1/4-7 x 4 | bolt square machine | 19 |
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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 | Plain | 5/8-11 x 4 | square hd m/b | 58 |
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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 | Steel | Plain | 3/8-16 x 4 | square m/b 1 9/16tl bolt 1 9/16tl | 297 |
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| Liberty | IL | Square Head Bolt | Grade 5 | Plain | 3/4-10 x 4 | square m/b f/t bolt f/tead | 30 |
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| Liberty | IL | Square Head Bolt | Steel | Plain | 1/2-13 x 4 | square m/b bolt | 175 |
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| Liberty | IL | Square Head Bolt | Steel | Zinc/Yellow | 1/2-13 x 4 | square m/b & bolt & | 112 |
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| Liberty | IL | Square Head Bolt | Steel | Plain | 1 1/8-7 x 4 | square m/b 2.5 thread length | 25 |
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| Komar | MO | Square Head Bolt | Grade 5 | Plain | 5/8-11 x 4 square head machine bolt grade 5 | 12 |
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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 | 1/2-13 x 4 | square m/b | 438 |
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| American | NY | Square Head Bolt | Steel | Plain | 1/4-20 x 4 | square m/b | 5900 |
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| Alma Bolt | MI | Square Head Bolt | Grade 2 | Plain | 1/2-13 x 4 | square bolt | 531 |
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| Alma Bolt | MI | Square Head Bolt | Grade 2 | Plain | 7/8-9 x 4 | square bolt | 375 |
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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 4 | square m/b std thrd fsb astm a307 | 400 |
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| XL Screw | GA | Square Head Bolt | Steel | Plain | 3/8-16 x 4 | square m/b std thrd fsb astm a307 | 250 |
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| XL Screw | GA | Square Head Bolt | Steel | Plain | 1/2-13 x 4 | square m/b std thrd fsb astm a307 | 190 |
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| XL Screw | GA | Square Head Bolt | Steel | Plain | 5/8-11 x 4 | square m/b std thrd fsb astm a307 | 110 |
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| XL Screw | GA | Square Head Bolt | Steel | Plain | 3/4-10 x 4 | square m/b std thrd fsb astm a307 | 70 |
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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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| XL Screw | GA | Square Head Bolt | Steel | Zinc/Clear | 3/4-10 x 4 | square hd m/b std thrd fsb astm a307 zp | 70 |
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| SWACO | OH | Square Head Bolt | Grade A | Plain | 1/4-20 x 4 | 1/4-20x4 a307 gr a square hd bolt pln | 589 |
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| Empire | WA | Square Head Bolt | Grade 5 | Plain | 3/8 x 4 | 3/8 x 4 gr 5 square head bolt | 1 |
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| MidStates | MI | Square Head Bolt | Class 12.9 | Plain | 3/4-16 x 4 | sq head set screw cup pt | 63 |
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| WDMB | IA | Square Head Bolt | 300 Stainless (A1,A2, 18-8,304,310 etc.) | Plain | 3/8-16 x 4 x 4 7/16 | bolt u sq (18 8) 3/8-16x4x4 7/16 drw (W0S0) (W0S0) (W0S0) | 396 |
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| WDMB | IA | Square Head Bolt | Grade 8 | Plain | 3/4-16 x 4 x 11 1/2 | bolt u sqr gr8.1 po 3/4-16x4x11 1/2 spc (W0B0) (W0B0) (W0B0) | 141 |
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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 | 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 8 | Plain | 3/4-10 x 4 | bolt & c/s square boltsquare b18.2.1 | 600 |
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| BIG BOLT | IL | Square Head Bolt | Grade 8 | Zinc/Yellow | 3/4-16 x 4 | bolt & c/s square boltfulthr b18.2.1 | 500 |
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| BIG BOLT | IL | Square Head Bolt | Grade 8 | Plain | 7/16-14 x 4 | bolt & c/s square boltsquare b18.2.1 | 1000 |
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| BIG BOLT | IL | Square Head Bolt | Steel | Plain | 1 3/8-6 x 4 | bolt & c/s square boltb18.2.1 | 1312 |
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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 8 | Plain | 1/2-13 x 4 | bolt & c/s square boltsquare b18.2.1 | 4000 |
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| BIG BOLT | IL | Square Head Bolt | Grade 5 | Plain | 5/8-11 x 4 | bolt & c/s square boltsquare b18.2.1 | 1381 |
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| BIG BOLT | IL | Square Head Bolt | Grade 5 | Plain | 1/2-13 x 4 | bolt & c/s square boltsquare b18.2.1 | 870 |
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| BIG BOLT | IL | Square Head Bolt | Grade 8 | Plain | 7/16-20 x 4 | bolt & c/s square boltsquare b18.2.1 | 1000 |
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| BIG BOLT | IL | Square Head Bolt | Grade 5 | Plain | 1/4-20 x 4 | bolt & c/s square boltsquare b18.2.1 | 6000 |
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| JET FITTING | CA | Square Head Bolt | Grade A | Plain | 1/4-20 x 4 | 1/4-20x4 a307 gr a square hd bolt pln 747023 b18.2.1 | 589 |
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| WDMB | IA | Square Head Bolt | Grade 5 | Zinc/Yellow | bolt sqr grade 5 (zy) 5/16-18x4 (W000) | 50 |
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| WDMB | IA | Square Head Bolt | Grade A | Plain | 9 x 4 | blt-sqr-a307 a-(pl)-7/8_9x4 (W0V0) | 250 |
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| SunPack | FL | Square Head Bolt | Grade A | Zinc/Clear | 3/4-10 x 4 | 3/4-10 x 4 a307 square head bolt pt zinc | 30 |
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| ISSCO | MO | Square Head Bolt | Grade 2 | Plain | 7/8-9 x 4 | 819 |
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| ISSCO | MO | Square Head Bolt | Grade 2 | Plain | 3/8-16 x 4 | 650 |
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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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| 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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| 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 | 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 | 7/8-9 x 4 | 7/8-9 x 4 square bolts plain b18.2.1 | 1 |
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| B & K FAST | PA | Square Head Bolt | Steel | Plain | 3/4-10 x 4 | 3/4-10 x 4 square bolts plain b18.2.1 | 17 |
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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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| 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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| Kanebridge | IL | Square Head Bolt | Steel | Plain | 1/2-13 x 4 | 1/2-13x4 square machine bolt plain | 2.500 |
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| Kanebridge | IL | Square Head Bolt | Steel | Plain | 5/8-11 x 4 | 5/8-11x4 square machine bolt plain | 1.875 |
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| Kanebridge | IL | Square Head Bolt | Steel | Plain | 7/8-9 x 4 | 7/8-9x4 square machine bolt plain | 0.750 |
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| BHAM | TX | Square Head Bolt | Steel | Galvanized | 3/8-16 x 4 | 3/8-16x4 square head bolt hdg b18.2.1 | 43 |
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| OSSCO | RI | Square Head Bolt | Steel | Plain | 1 1/4-7 x 4 | 1 1/4-7x4 square hd mach bolt b18.2.1 | 3 |
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| OSSCO | RI | Square Head Bolt | Steel | Galvanized | 1/4-20 x 4 | 1/4-20x4 square hd mach bolt h.d.g. b18.2.1 | 8 |
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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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| BoltCraft | NE | Square Head Bolt | Steel | Zinc/Clear | 5/8-11 x 4 | 5/8-11 x 4 square head machine bolt zinc 125/ctn | inquire |
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| ZAL INDUS | CA | Square Head Bolt | Steel | Plain | 1/2-13 x 4 | 1/2-13 x 4 sq hd mach bolt | 308 |
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| ZAL INDUS | CA | Square Head Bolt | Steel | Plain | 5/8-11 x 4 | 5/8-11 x 4 sq hd mach bolt | 86 |
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| FastWare | Sask | Square Head Bolt | Grade 8 | Zinc/Yellow | 3/4-10 x 4 | nc square m/b 1 3/4 tl | 1,155 |
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| SRF | AL | Square Head Bolt | Grade 2 | Plain | 1/4-20 x 4 | square hd bolt | 5 |
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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 | 1/2-13 x 4 | square hd bolt | - |
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| SRF | AL | Square Head Bolt | Grade 8 | Plain | 5/8-11 x 4 | square hd bolt | - |
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| SRF | AL | Square Head Bolt | Steel | Plain | 3/4-10 x 4 | t-bolt square neck | 100 |
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| CNB | IL | Square Head Bolt | Grade 2 | Plain | 1/2-13 x 4 | square m/m gr. 2 | 100 |
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| THRDFAST | OK | Square Head Bolt | Steel | Galvanized | 7/8-9 x 4 | square hd bolt hdg b18.2.1 | 215 |
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| THRDFAST | OK | Square Head Bolt | Steel | Galvanized | 5/8-11 x 4 | square hd bolt hdg b18.2.1 | 117 |
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| THRDFAST | TN | Square Head Bolt | Steel | Galvanized | 3/8-16 x 4 | square hd bolt hdg b18.2.1 | 174 |
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| SIS | AZ | Square Head Bolt | Grade 5 | Galvanized | 5/8-11 x 4 | f/t square bolt gr.5 | 21 |
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| SIS | AZ | Square Head Bolt | Grade 5 | Galvanized | 3/4-10 x 4 | long (4 thread) square hd bolt gr.5 | 1306 |
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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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| THRDFAST | AL | Square Head Bolt | Steel | Galvanized | 7/8-9 x 4 | square hd bolt hdg b18.2.1 | 10 |
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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 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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| KBS | TN | Square Head Bolt | Grade 8 | Plain | 3/4-10 x 4 | 3/4-10 x 4 square mach bolt gr-8 b18.2.1 | 219 |
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| KBS | TN | Square Head Bolt | Steel | Plain | 7/8-9 x 4 | 7/8-9 x 4 square hd mach.bolt b18.2.1 | 123 |
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| THRDFAST | FL | Square Head Bolt | Grade 8 | Plain | 3/4-10 x 4 | gr8 square hd bolt b18.2.1 | 17 |
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| FMP | MA | Square Head Bolt | Steel | Plain | 1/4-20 x 4 | square bolt | 700 |
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| FMP | MA | Square Head Bolt | Steel | Plain | 5/8 x 4 | square lag/s | 1700 |
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| FMP | MA | Square Head Bolt | Steel | Plain | 3/4-10 x 4 | square bolt | 8 |
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| Valley Nu | WA | Square Head Bolt | Steel | Zinc/Black | 1/2-13 x 4 | nc square bolt zb | 108 |
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| Valley Nu | WA | Square Head Bolt | Steel | Plain | 7/8-9 x 4 | nc square bolt pl | 30 |
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| Valley Nu | WA | Square Head Bolt | Grade 5 | Plain | 7/8-9 x 4 | nc gr5 square bolt pl | 9 |
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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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| ACCURATE | IL | Square Head Bolt | Steel | Plain | 3/4-10 x 4 | square m/b | 400 |
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| ACCURATE | IL | Square Head Bolt | Steel | Zinc/Clear | 5/8-11 x 4 | square m/b | 300 |
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| ACCURATE | IL | Square Head Bolt | Steel | Zinc/Clear | 1/2-13 x 4 | square fulthr m/b | 1,600 |
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| ACCURATE | IL | Square Head Bolt | Steel | Zinc/Clear | 1/2-13 x 4 | square m/b | 1,600 |
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| ACCURATE | IL | Square Head Bolt | Steel | Zinc/Clear | 1/4-20 x 4 | square m/b | 1,500 |
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| ACCURATE | IL | Square Head Bolt | Steel | Plain | 1 1/4-7 x 4 | square m/b | 50 |
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| ACCURATE | IL | Square Head Bolt | Steel | Plain | 1 1/8-7 x 4 | square m/b | 140 |
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| ACCURATE | IL | Square Head Bolt | Steel | Zinc/Clear | 7/16-14 x 4 | square m/b | 225 |
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| QFS | MI | Square Head Bolt | 300 Stainless (A1,A2, 18-8,304,310 etc.) | Plain | 3/8-16 x 4 | Square head set screw cup point STAINLESS STEEL | 75 |
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