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1/4 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 .
135 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 | Steel | Plain | 1/4-20 x 7/16 | bolt & c/s square boltsquare b18.2.1 | 1000 |
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| ZAL INDUS | CA | Square Head Bolt | Grade 2 | Zinc/Clear | 1/4-20 x 1/2 | 1/4-20 x 1/2 sq hd mach bolt grade 2 pltd | 8,483 |
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| AFI | FL | Square Head Bolt | Steel | Zinc/Clear | 1/4-20 x 1/2 | 1/4-20x1/2 sq hd cup pt st zn () () | 1000 |
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| American | NY | Square Head Bolt | Steel | Plain | 1/4-20 x 5/8 | square m/b | 100 |
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| American | NY | Square Head Bolt | Steel | Black Oxide | 1/4-20 x 3/4 | square m/b black ox | 5150 |
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| ISSCO | MO | Square Head Bolt | Grade 2 | Zinc/Clear | 1/4-20 x 3/4 | 6800 |
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| QFS | MI | Square Head Bolt | 300 Stainless (A1,A2, 18-8,304,310 etc.) | Plain | 1/4-20 x 3/4 | Square head set screw cup point | 12 |
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| ASMC | IL | Square Head Bolt | Grade A | Galvanized | 1/4-20 x 3/4 | a307 gra square hd m/b low carb hdg | 550 |
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| Alma Bolt | MI | Square Head Bolt | Grade 2 | Plain | 1/4-20 x 3/4 | square bolt | 3710 |
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| ASMC | IL | Square Head Bolt | Grade A | Zinc/Clear | 1/4-20 x 3/4 | a307 gra square hd m/b low carb zp | 2,750 |
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| UNEEDA | NJ | Square Head Bolt | Steel | Plain | 1/4-20 x 7/8 | sq. mach bolt st | 1900 |
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| B & K FAST | PA | Square Head Bolt | Steel | Galvanized | 1/4-20 x 1 | 1/4-20 x 1 galv square bolts b18.2.1 | 79 |
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| ACF | CA | Square Head Bolt | 300 Stainless (A1,A2, 18-8,304,310 etc.) | Plain | 1/4-20 x 1 | 1/4-20x1 s/s square head bolt with groove ( print ) | 33 |
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| HBBOLT | CA | Square Head Bolt | Steel | Plain | 1/4-20 x 1 | square hd mb | 500 |
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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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| IRF | NC | Square Head Bolt | Steel | Zinc/Clear | 1/4-20 x 1 | blt stve trs w sq nut stl | 9600 |
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| GUIDON | NJ | Square Head Bolt | Steel | Zinc/Clear | 1/4-20 x 1 | square head machine bolt a307a | 600 |
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| SRF | AL | Square Head Bolt | Grade 2 | Plain | 1/4-20 x 1 | square hd bolt | 12 |
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| FMP | MA | Square Head Bolt | Steel | Plain | 1/4-20 x 1 | square bolt | 140 |
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| WSB | KY | Square Head Bolt | Grade 2 | Zinc/Clear | 1/4-20 x 1 | blt sqr gr2 (zn) 1/4-20x1 b18.2.1 | 7,994 |
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| ZAL INDUS | CA | Square Head Bolt | Grade 2 | Plain | 1/4-20 x 1 | 1/4-20 x 1 sq hd mach bolt grade 2 | 2,250 |
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| ASMC | IL | Square Head Bolt | Grade A | Zinc/Clear | 1/4-20 x 1 | a307 gra square hd m/b low carb zp | 2,333 |
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| BIG BOLT | IL | Square Head Bolt | Grade 5 | Plain | 1/4-20 x 1 | bolt & c/s square boltsquare b18.2.1 | 1200 |
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| Kanebridge | IL | Square Head Bolt | Steel | Plain | 1/4-20 x 1 | 1/4-20x1 square machine bolt plain | 37.500 |
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| XL Screw | GA | Square Head Bolt | Steel | Plain | 1/4-20 x 1 | f/t square hd m/b astm a307 | 2,000 |
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| XL Screw | GA | Square Head Bolt | Steel | Plain | 1/4-20 x 1 | square m/b std thrd fsb astm a307 | 2,000 |
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| ASMC | IL | Square Head Bolt | Grade A | Plain | 1/4-20 x 1 | (ft) coarse a307 gra square hd m/b low carb | 500 |
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| Mansco | MI | Square Head Bolt | Steel | Zinc/Clear | 1/4-20 x 1 | 1/4-20 x 1 square hd machine bolt triv znc w/nylon patch | 2175 |
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| American | NY | Square Head Bolt | Steel | Plain | 1/4-20 x 1 1/4 | square m/b | 10000 |
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| SRF | AL | Square Head Bolt | Grade 2 | Plain | 1/4-20 x 1 1/4 | square hd bolt | - |
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| ASMC | IL | Square Head Bolt | Grade A | Zinc/Clear | 1/4-20 x 1 1/4 | a307 gra square hd m/b low carb zp | 850 |
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| ASMC | IL | Square Head Bolt | Grade A | Plain | 1/4-20 x 1 1/4 | (pt) coarse a307 gra square hd m/b low carb | 1,500 |
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| ASMC | IL | Square Head Bolt | Grade A | Galvanized | 1/4-20 x 1 1/4 | a307 gra square hd m/b low carb hdg b18.2.1 | 1,325 |
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| Kanebridge | IL | Square Head Bolt | Steel | Plain | 1/4-20 x 1 1/4 | 1/4-20x1 1/4 square machine bolt plain | 25,000 |
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| XL Screw | GA | Square Head Bolt | Steel | Plain | 1/4-20 x 1 1/4 | f/t square hd m/b astm a307 | 1,800 |
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| XL Screw | GA | Square Head Bolt | Steel | Plain | 1/4-20 x 1 1/4 | square m/b std thrd fsb astm a307 | 1,800 |
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| ISSCO | MO | Square Head Bolt | Grade 2 | Plain | 1/4-20 x 1 3/8 | 3450 |
| |
| CNB | IL | Square Head Bolt | Grade 2 | Plain | 1/4-20 x 1 1/2 | square m/b | 400 |
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| CNB | IL | Square Head Bolt | Grade 2 | Zinc/Clear | 1/4-20 x 1 1/2 | square m/b | 200 |
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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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| B & K FAST | PA | Square Head Bolt | Steel | Galvanized | 1/4-20 x 1 1/2 | 1/4-20 x 1 1/2 galv square bolts b18.2.1 | 53 |
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| MESAFAST | CA | Square Head Bolt | Steel | Plain | 1/4-20 x 1 1/2 | square bolt | 100.0 |
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| ISSCO | MO | Square Head Bolt | 300 Stainless (A1,A2, 18-8,304,310 etc.) | Plain | 1/4-28 x 1 1/2 | 18-8 | 120 |
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| ASMC | IL | Square Head Bolt | Grade A | Zinc/Clear | 1/4-20 x 1 1/2 | a307 gra square hd m/b low carb zp | 1,850 |
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| Liberty | IL | Square Head Bolt | Steel | Plain | 1/4-20 x 1 1/2 | square m/b machine bolt | 670 |
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| Liberty | IL | Square Head Bolt | Steel | Zinc/Clear | 1/4-20 x 1 1/2 | square m/b machine bolt | 990 |
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| XL Screw | GA | Square Head Bolt | Steel | Plain | 1/4-20 x 1 1/2 | f/t square hd m/b astm a307 | 1,500 |
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| XL Screw | GA | Square Head Bolt | Steel | Plain | 1/4-20 x 1 1/2 | square m/b std thrd fsb astm a307 | 1,500 |
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| ASMC | IL | Square Head Bolt | Grade A | Plain | 1/4-20 x 1 1/2 | (pt) coarse a307 gra square hd m/b low carb | 88 |
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| ASMC | IL | Square Head Bolt | Grade A | Galvanized | 1/4-20 x 1 1/2 | a307 gra square hd m/b low carb hdg | 3,309 |
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| BIG BOLT | IL | Square Head Bolt | Steel | Plain | 1/4-20 x 16 | bolt & c/s square boltsquare b18.2.1 | 1000 |
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| QFC | TX | Square Head Bolt | Grade A36 | Galvanized | 1/4 x 1 3/4 x 1 3/4 | 1/4 x 1 3/4 x 1 3/4 sq. ring fill plate a36 hdg (for 5/8 bolt) AS36849 b18.2.1 | 4 |
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| SRF | AL | Square Head Bolt | Grade 2 | Plain | 1/4-20 x 1 3/4 | square hd bolt | 69 |
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| IPC | VA | Square Head Bolt | Grade A | Plain | 1/4-20 x 1 3/4 | 1/4-20x1 3/4 square hd mach bolt a307 gr a steel grade 2 acceptable | 200 |
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| ACCURATE | IL | Square Head Bolt | Steel | Zinc/Clear | 1/4-20 x 1 3/4 | square m/b | 1,000 |
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| Hayes | CA | Square Head Bolt | Steel | Plain | 1/4-20 x 1 3/4 | 1/4-20 x 1 3/4 square hd bolt pln | 49 |
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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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| Ababa | CA | Square Head Bolt | Steel | Zinc/Clear | 1/4-20 x 2 | 1/4-20 x 2 sq hd blt full thrd steel znc b18.2.1 | 200 |
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| SRF | AL | Square Head Bolt | Grade 2 | Zinc/Clear | 1/4-20 x 2 | square hd bolt | - |
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| QFS | MI | Square Head Bolt | 300 Stainless (A1,A2, 18-8,304,310 etc.) | Plain | 1/4-20 x 2 | Square head set screw cup point STAINLESS STEEL | 19 |
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| ASMC | IL | Square Head Bolt | Grade A | Zinc/Clear | 1/4-20 x 2 | a307 gra square hd m/b low carb zp | 1,250 |
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| ZAL INDUS | CA | Square Head Bolt | Steel | Zinc/Clear | 1/4-20 x 2 | 1/4-20 x 2 sq hd mach bolt pltd | 1,700 |
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| BIG BOLT | IL | Square Head Bolt | Grade 5 | Plain | 1/4-20 x 2 | bolt & c/s square boltsquare b18.2.1 | 6000 |
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| Kanebridge | IL | Square Head Bolt | Steel | Plain | 1/4-20 x 2 | 1/4-20x2 square machine bolt plain | 20,000 |
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| XL Screw | GA | Square Head Bolt | Steel | Plain | 1/4-20 x 2 | f/t square hd m/b astm a307 | 1,300 |
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| XL Screw | GA | Square Head Bolt | Steel | Plain | 1/4-20 x 2 | square m/b std thrd fsb astm a307 | 1,300 |
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| ASMC | IL | Square Head Bolt | Grade A | Galvanized | 1/4-20 x 2 | a307 gra square hd m/b low carb hdg | 150 |
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| ASMC | IL | Square Head Bolt | Grade A | Plain | 1/4-20 x 2 | (pt) coarse a307 gra square hd m/b low carb | 350 |
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| ACCURATE | IL | Square Head Bolt | Steel | Zinc/Clear | 1/4-20 x 2 | square m/b | 300 |
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| Hayes | CA | Square Head Bolt | Steel | Plain | 1/4-20 x 2 | 1/4-20 x 2 square hd bolt pln | 76 |
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| Valley Nu | WA | Square Head Bolt | Steel | Zinc/Black | 1/4-20 x 2 | nc square bolt zb | 84 |
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| MidStates | MI | Square Head Bolt | Grade 2 | Plain | 1/4-20 x 2 1/4 | 1/4-20 x 2 1/4 square hd bolt gr 2 pln | 380 |
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| ACCURATE | IL | Square Head Bolt | Steel | Zinc/Clear | 1/4-20 x 2 1/4 | square m/b | 1,300 |
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| ACCURATE | IL | Square Head Bolt | Steel | Plain | 1/4-20 x 2 1/2 | bolt square machine black | 350 |
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| Liberty | IL | Square Head Bolt | Grade 5 | Zinc/Black | 1/4-20 x 2 1/2 | square m/b gr.5 f/t black bolt gr.5 f/t black | 2,389 |
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| XL Screw | GA | Square Head Bolt | Steel | Plain | 1/4-20 x 2 1/2 | f/t square hd m/b astm a307 | 1,200 |
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| XL Screw | GA | Square Head Bolt | Steel | Plain | 1/4-20 x 2 1/2 | square m/b std thrd fsb astm a307 | 1,200 |
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| ACCURATE | IL | Square Head Bolt | Steel | Zinc/Clear | 1/4-20 x 2 1/2 | square m/b | 600 |
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| ASMC | IL | Square Head Bolt | Grade A | Galvanized | 1/4-20 x 2 1/2 | a307 gra square hd m/b low carb hdg b18.2.1 | 1,200 |
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| Hayes | CA | Square Head Bolt | Steel | Plain | 1/4-20 x 2 1/2 | 1/4-20 x 2 1/2 square hd bolt pln | 385 |
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| ASMC | IL | Square Head Bolt | Grade A | Plain | 1/4-20 x 2 1/2 | 1/4-20x2 1/2 (pt) coarse a307 gra square hd machine bolt low carb pln b18.2.1 | 200 |
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| Valley Nu | WA | Square Head Bolt | Steel | Plain | 1/4-20 x 2 1/2 | nc square bolt pl | 2 |
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| Liberty | IL | Square Head Bolt | Steel | Plain | 1/4-20 x 2 3/4 | square m/b machine bolt | 1,500 |
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| American | NY | Square Head Bolt | Steel | Plain | 1/4-20 x 3 | square m/s bolt | 100 |
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| ACCURATE | IL | Square Head Bolt | Steel | Plain | 1/4-20 x 3 | bolt square machine | 150 |
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| SRF | AL | Square Head Bolt | Grade 2 | Plain | 1/4-20 x 3 | square hd bolt | 9 |
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| ASMC | IL | Square Head Bolt | Grade A | Plain | 1/4-20 x 3 | (pt) coarse a307 gra square hd m/b low carb | 33 |
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| BIG BOLT | IL | Square Head Bolt | Grade 5 | Plain | 1/4-20 x 3 | bolt & c/s square boltsquare b18.2.1 | 6000 |
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| XL Screw | GA | Square Head Bolt | Steel | Plain | 1/4-20 x 3 | f/t square hd m/b astm a307 | 1,000 |
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| XL Screw | GA | Square Head Bolt | Steel | Plain | 1/4-20 x 3 | square m/b std thrd fsb astm a307 | 1,000 |
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| ACCURATE | IL | Square Head Bolt | Steel | Zinc/Clear | 1/4-20 x 3 | square fulthr m/b | 500 |
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| ASMC | IL | Square Head Bolt | Grade A | Galvanized | 1/4-20 x 3 | a307 gra square hd m/b low carb hdg b18.2.1 | 128 |
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| Hayes | CA | Square Head Bolt | Steel | Plain | 1/4-20 x 3 | 1/4-20 x 3 square hd bolt pln | 50 |
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| Valley Nu | WA | Square Head Bolt | Steel | Zinc/Black | 1/4-20 x 3 | nc square bolt zb | 56 |
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| ACCURATE | IL | Square Head Bolt | Steel | Plain | 1/4-20 x 3 1/4 | bolt square machine | 200 |
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| ACCURATE | IL | Square Head Bolt | Steel | Zinc/Clear | 1/4-20 x 3 1/4 | bolt square machine | 1500 |
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| ACCURATE | IL | Square Head Bolt | Steel | Zinc/Clear | 1/4-20 x 3 1/4 | square m/b | 1,700 |
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| FMP | MA | Square Head Bolt | Steel | Plain | 1/4-20 x 3 1/2 | square bolt | 750 |
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| ZAL INDUS | CA | Square Head Bolt | Steel | Plain | 1/4-20 x 3 1/2 | 1/4-20 x 3 1/2 sq hd mach bolt | 2,500 |
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| Alma Bolt | MI | Square Head Bolt | Grade 2 | Plain | 1/4-20 x 3 1/2 | square bolt | 4184 |
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| ACCURATE | IL | Square Head Bolt | Steel | Zinc/Clear | 1/4-20 x 3 1/2 | square m/b | 600 |
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| ASMC | IL | Square Head Bolt | Grade A | Galvanized | 1/4-20 x 3 1/2 | a307 gra square hd m/b low carb hdg b18.2.1 | 350 |
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| Valley Nu | WA | Square Head Bolt | Steel | Plain | 1/4-20 x 3 1/2 | nc square bolt pl | 11 |
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| American | NY | Square Head Bolt | Steel | Plain | 1/4-20 x 4 | square m/b | 5900 |
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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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| 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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| FMP | MA | Square Head Bolt | Steel | Plain | 1/4-20 x 4 | square bolt | 700 |
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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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| ACCURATE | IL | Square Head Bolt | Steel | Zinc/Clear | 1/4-20 x 4 | square m/b | 1,500 |
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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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| 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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| 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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| 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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| American | NY | Square Head Bolt | Steel | Zinc/Clear | 1/4-20 x 4 1/2 | square bolt pl | 100 |
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| MidStates | MI | Square Head Bolt | Grade 2 | Zinc/Clear | 1/4-20 x 4 1/2 | square hd bolt znc | 176 |
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| FMP | MA | Square Head Bolt | Steel | Plain | 1/4-20 x 4 1/2 | square bolt | 25 |
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| Liberty | IL | Square Head Bolt | Steel | Plain | 1/4-20 x 4 1/2 | square hd mach bolt | 200 |
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| ACCURATE | IL | Square Head Bolt | Steel | Zinc/Clear | 1/4-20 x 4 1/2 | square m/b | 1,000 |
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| SRF | AL | Square Head Bolt | Grade 2 | Plain | 1/4-20 x 5 | square hd bolt | 25 |
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| BIG BOLT | IL | Square Head Bolt | Grade 5 | Plain | 1/4-20 x 5 | bolt & c/s square boltsquare b18.2.1 | 6000 |
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| ACCURATE | IL | Square Head Bolt | Steel | Zinc/Clear | 1/4-20 x 5 | square m/b | 1,200 |
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| Valley Nu | WA | Square Head Bolt | Steel | Plain | 1/4-20 x 5 | nc square bolt pl | 7 |
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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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| ACCURATE | IL | Square Head Bolt | Steel | Zinc/Clear | 1/4-20 x 5 1/2 | square m/b | 3,225 |
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| ACCURATE | IL | Square Head Bolt | Steel | Zinc/Clear | 1/4-20 x 6 | square m/b | 575 |
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| Hayes | CA | Square Head Bolt | Steel | Zinc/Clear | 1/4-20 x 6 | 1/4-20 x 6 square hd bolt zinc | 81 |
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| ACCURATE | IL | Square Head Bolt | Steel | Zinc/Clear | 1/4-20 x 6 1/2 | square m/b | 100 |
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| Valley Nu | WA | Square Head Bolt | Steel | Plain | 1/4-20 x 6 1/2 | nc square bolt pl | 9 |
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| BIG BOLT | IL | Square Head Bolt | Steel | Plain | 1/4-20 x 8 | bolt & c/s square boltsquare b18.2.1 | 1000 |
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| MidStates | MI | Square Head Bolt | Grade 2 | Plain | 1/4-20 x 8 | 1/4-20 x 8in square hd bolt gr 2 pln | 154 |
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| BIG BOLT | IL | Square Head Bolt | Steel | Plain | 1/4-20 x 10 | bolt & c/s square boltsquare b18.2.1 | 1000 |
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| BIG BOLT | IL | Square Head Bolt | Steel | Plain | 1/4-20 x 12 | bolt & c/s square boltsquare b18.2.1 | 1000 |
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| BIG BOLT | IL | Square Head Bolt | Steel | Plain | 1/4-2 0 x 14 | bolt & c/s square boltsquare b18.2.1 | 1000 |
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| Valley Nu | WA | Square Head Bolt | Steel | Galvanized | 1/4 | square hd plug usa | 67 |
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| Valley Nu | WA | Square Head Bolt | Steel | Plain | 1/4 | square hd plug | 11 |
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