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2 1/2 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 .
114 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 | |
| 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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| Hayes | CA | Square Head Bolt | Steel | Plain | 5/8-11 x 2 1/2 | 5/8-11 x 2 1/2 square hd bolt pln | 1 |
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| YANKEE | NH | Square Head Bolt | Grade A | Plain | 1/2-13 x 2 1/2 | 1/2-13 x 2-1/2 square head bolt astm a307 | 292 |
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| YANKEE | NH | Square Head Bolt | Steel | Plain | 5/8-11 x 2 1/2 | 5/8-11 x 2 1/2 square hd bolt | 7 |
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| Endries | WI | Square Head Bolt | Steel | Plain | 7/16-14 x 2 1/2 | 7/16-14x2-1/2 square head machine bolt plain | 350 |
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| Endries | WI | Square Head Bolt | Steel | Zinc/Clear | 7/16-14 x 2 1/2 | 7/16-14x2-1/2 square head machine bolt zinc | 250 |
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| Endries | WI | Square Head Bolt | Steel | Zinc/Clear | 3/8-16x2-1/2 square head machine bolt full thread zinc | 1702 |
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| Jackson | MS | Square Head Bolt | Grade 5 | Zinc/Clear | 5/8-11 x 2 1/2 | nc square bolt gr.5 | 8 |
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| Jackson | MS | Square Head Bolt | Grade 5 | Zinc/Clear | 3/4 x 2 1/2 | nc square bolt gr.5 | 12 |
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| Jackson | MS | Square Head Bolt | Grade 8 | Plain | 5/8-11 x 2 1/2 | square bolt gr. 8 | 1 |
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| Jackson | MS | Square Head Bolt | Grade 2 | Galvanized | 3/8-16 x 2 1/2 | square bolt hdg | 295 |
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| Jackson | MS | Square Head Bolt | Grade 2 | Plain | 1/2-13 x 2 1/2 | square bolt | 200 |
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| Jackson | MS | Square Head Bolt | Grade 2 | Plain | 5/8-11 x 2 1/2 | square bolt gr. 2 | 210 |
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| SWACO | OH | Square Head Bolt | Grade A | Plain | 7/8-9 x 2 1/2 | 7/8-9x2 1/2 a307 gr a square hd bolt pl | 20 |
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| SWACO | OH | Square Head Bolt | Grade A | Plain | 5/8-11 x 2 1/2 | 5/8-11x2 1/2 a307 gr a square hd bolt p | 50 |
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| CIF | IL | Square Head Bolt | 300 Stainless (A1,A2, 18-8,304,310 etc.) | Plain | 5/8-11 x 2 1/2 | 5/8-11 x 2 1/2 square head machine bolt 310 stainless steel | 109 |
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| R&S Indus | OR | Square Head Bolt | Steel | Galvanized | 3/4-10 x 2 1/2 | 3/4-10 x 2 1/2 machine bolt square head hdg | 90 |
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| CNB | IL | Square Head Bolt | Steel | Plain | 1/2-13 x 2 1/2 | 1/2-13 x 2 1/2 square head machine bolt plain | 251 |
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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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| ACCURATE | IL | Square Head Bolt | Steel | Plain | 1/2-13 x 2 1/2 | bolt plow #4 square | 50 |
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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 | 3/8-16 x 2 1/2 | bolt square machine | 1350 |
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| BHAM | AL | Square Head Bolt | Steel | Plain | 1/2-13 x 2 1/2 | 1/2-13 x 2 1/2 sq head bolt 1.25 thread | | 75 |
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| Komar | IL | Square Head Bolt | Ni-Cu Alloy (Monel, K-Monel, etc.) | Copper Plated | 3/8-16 x 2 1/2 | 3/8-16 x 2 1/2 square head machine bolt-copper flash/.00015 electroless nickel |
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| A-Plus Co | OR | Square Head Bolt | Steel | Black Oxide | 5/16-18 x 2 1/2 | 5/16-18 x 2 1/2 sq hd bolt black oxide | 50 |
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| Howe Fast | OH | Square Head Bolt | Steel | Zinc/Clear | 5/16-18 x 2 1/2 | square head set screw half dog point zinc | 250 |
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| Howe Fast | OH | Square Head Bolt | Steel | Zinc/Clear | 3/8-16 x 2 1/2 | square head set screws half dog point zinc | 300 |
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| Alma Bolt | MI | Square Head Bolt | Grade 8 | Plain | 3/4-10 x 2 1/2 | 3/4-10 x 2 1/2 | square head bolt grade 8 | 20 |
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| Alma Bolt | MI | Square Head Bolt | Grade 5 | Plain | 3/4-10 x 2 1/2 | 3/4-10 x 2 1/2 | square head bolt grade 5 | 16 |
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| Alma Bolt | MI | Square Head Bolt | Grade 2 | Plain | 3/8-16 x 2 1/2 | 3/8-16 x 2 1/2 | square head bolt grade 2 | 16 |
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| Alma Bolt | MI | Square Head Bolt | Grade 2 | Plain | 5/8-11 x 2 1/2 | 5/8-11 x 2 1/2 | square head bolt grade 2 | 88 |
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| Alma Bolt | MI | Square Head Bolt | Grade 2 | Plain | 3/4-10 x 2 1/2 | 3/4-10 x 2 1/2 | square head bolt grade 2 | 135 |
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| Alma Bolt | MI | Square Head Bolt | Steel | Galvanized | 1/2-13 x 2 1/2 | 1/2-13 x 2 1/2 | hdg sq mach bolt | 75 |
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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 | 7/8-9 x 2 1/2 | square bolt | 503 |
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| Alma Bolt | MI | Square Head Bolt | Grade 2 | Plain | 1/2-13 x 2 1/2 | 1/2-13 x 2 1/2 square head bolt grade 2 | 165 |
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| Liberty | IL | Square Head Bolt | Steel | Zinc/Yellow | 1/2-13 x 2 1/2 | square m/b & machine bolt & | 100 |
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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 | 3/8-16 x 2 1/2 | square m/b no mark m/b no mark | 967 |
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| Liberty | IL | Square Head Bolt | 300 Stainless (A1,A2, 18-8,304,310 etc.) | Plain | 1/2-13 x 2 1/2 | square m/b 18-8 s/s | 70 |
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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 | 12 |
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| Liberty | IL | Square Head Bolt | Steel | Plain | 3/4-10 x 2 1/2 | square m/b machine bolt | 15 |
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| Liberty | IL | Square Head Bolt | 316, 317, A4 Stainless | Plain | 1/2-13 x 2 1/2 | square m/b 316 stainless | 88 |
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| American | WI | Square Head Bolt | 300 Stainless (A1,A2, 18-8,304,310 etc.) | Plain | 5/8-11 x 2 1/2 | 5/8-11x2-1/2 nc square hd mach bolt #310 ss | 194 |
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| Empire | WA | Square Head Bolt | Steel | Plain | 1/2 x 2 1/2 | 1/2 x 2-1/2 square head bolt | 115 |
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| Komar | IL | Square Head Bolt | Ni-Cu Alloy (Monel, K-Monel, etc.) | Plain | 3/8-16 x 2 1/2 | 3/8-16 x 2 1/2 square head machine bolt-copper flash/.00015 electroless nickel |
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| Longhorn | TX | Square Head Bolt | Grade 2 | Galvanized | 5/16-18 x 2 1/2 | 5/16-18 x 2-1/2 sq hd bolt gr 2 gal | 304 |
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| Longhorn | TX | Square Head Bolt | Grade 5 | Plain | 5/8-11 x 2 1/2 | 5/8-11 x 2-1/2 square hd bolt gr 5 | 25 |
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| Raw Produ | NJ | Square Head Bolt | Steel | Galvanized | 1/2-13 x 2 1/2 | square head bolts hdg 1/2-13 x 2-1/2 | 500 |
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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 | Zinc/Yellow | 3/8-16 x 2 1/2 | square hd m/b zy | 1000 |
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| American | NY | Square Head Bolt | Steel | Plain | 7/8-9 x 2 1/2 | square m/b | 50 |
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| BIG BOLT | IL | Square Head Bolt | Grade 5 | Plain | 7/16-14 x 2 1/2 | bolt & c/s square boltsquare b18.2.1 | 890 |
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| BIG BOLT | IL | Square Head Bolt | Grade 5 | Plain | 1/2-13 x 2 1/2 | bolt & c/s square boltsquare fulthr b18.2.1 | 10800 |
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| BIG BOLT | IL | Square Head Bolt | 300 Stainless (A1,A2, 18-8,304,310 etc.) | Plain | 5/8-11 x 2 1/2 | 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 2 1/2 | bolt & c/s square boltsquare b18.2.1 | 5000 |
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| BIG BOLT | IL | Square Head Bolt | Grade 8 | Plain | 5/8-11 x 2 1/2 | bolt & c/s square boltsquare b18.2.1 | 14600 |
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| Fastener | OH | Square Head Bolt | Grade 5 | Plain | 1/2-13 x 2 1/2 | square head machine bolt 1/2-13x2 1/2 grade 5 plain | 20 |
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| Fastener | OH | Square Head Bolt | Grade 2 | Plain | 3/4-10 x 2 1/2 | square head bolt 3/4-10x2-1/2 grade 2 plain | 62 |
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| Ababa | CA | Square Head Bolt | Grade 8 | Plain | 3/4-10 x 2 1/2 | 3/4-10 x 2-1/2 square head bolt gr.8 plain b18.2.1 | 20 |
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| Ababa | CA | Square Head Bolt | Steel | Zinc/Clear | 5/8-11 x 2 1/2 | 5/8-11 x 2 1/2 sq hd blt steel znc b18.2.1 | 156 |
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| Ababa | CA | Square Head Bolt | Steel | Plain | 3/8-16 x 2 1/2 | 3/8-16 x 2 1/2 sq hd bolt steel pln b18.2.1 | 1 |
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| 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 | 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 | 1/4-20 x 2 1/2 | square m/b std thrd fsb astm a307 | 1,200 |
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| XL Screw | GA | Square Head Bolt | Steel | Plain | 3/8-16 x 2 1/2 | square m/b std thrd fsb astm a307 | 450 |
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| XL Screw | GA | Square Head Bolt | Steel | Plain | 5/16-18 x 2 1/2 | square m/b std thrd fsb astm a307 | 600 |
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| XL Screw | GA | Square Head Bolt | Steel | Plain | 1/2-13 x 2 1/2 | square m/b std thrd fsb astm a307 | 270 |
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| XL Screw | GA | Square Head Bolt | Steel | Plain | 5/8-11 x 2 1/2 | square m/b std thrd fsb astm a307 | 150 |
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| XL Screw | GA | Square Head Bolt | Steel | Plain | 3/4-10 x 2 1/2 | square m/b std thrd fsb astm a307 | 100 |
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| IPC | VA | Square Head Bolt | Steel | Zinc/Yellow | 3/4-10 x 2 1/2 | 3/4-10x2 1/2 partial thread square hd mach bolt steel zinc yellow must be partial thread | 500 |
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| IPC | VA | Square Head Bolt | Grade A | Zinc/Yellow | 5/8-11 x 2 1/2 | 5/8-11x2 1/2 square hd mach bolt a307 steel zinc yellow | 90 |
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| IPC | VA | Square Head Bolt | Grade 2 | Zinc/Clear | 3/8-16 x 2 1/2 | 3/8-16x2 1/2 square hd mach bolt grade 2 cr3 zinc-rohs | 4,000 |
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| IPC | VA | Square Head Bolt | Grade 2 | Plain | 1/2-13 x 2 1/2 | 1/2-13x2 1/2 square hd mach bolt grade 2 plain | 205 |
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| Delta | TX | Square Head Bolt | Steel | Plain | 5/8-11 x 2 1/2 | square hd bolt plain 5/8-11 x 2 1/2 | 62 |
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| Hodell | OH | Square Head Bolt | 300 Stainless (A1,A2, 18-8,304,310 etc.) | Plain | 3/4-10 x 2 1/2 | 3/4-10x2-1/2 square hd stsc cup pt 18-8 sst | 110 |
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| ISSCO | MO | Square Head Bolt | Grade 2 | Plain | 5/16-18 x 2 1/2 | 895 |
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| SIS | AZ | Square Head Bolt | Grade 5 | Galvanized | 5/8-11 x 2 1/2 | long (1-1/2 thread) square hd bolt gr.5 stl | 239 |
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| SIS | AZ | Square Head Bolt | Grade 5 | Galvanized | 3/4-10 x 2 1/2 | long (1-1/2 thread) square hd bolt gr.5 stl | 208 |
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| SIS | AZ | Square Head Bolt | Steel | Galvanized | 5/8-11 x 2 1/2 | square m/b 1015 hot dip | 311 |
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| B & K FAST | PA | Square Head Bolt | Steel | Plain | 3/4-10 x 2 1/2 | 3/4-10 x 2 1/2 square bolts plain b18.2.1 | 57 |
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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 | 3/8-16 x 2 1/2 | 3/8-16x2 1/2 square machine bolt plain | 7.500 |
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| Kanebridge | IL | Square Head Bolt | Steel | Plain | 1/2-13 x 2 1/2 | 1/2-13x2 1/2 square machine bolt plain | 3.750 |
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| Kanebridge | IL | Square Head Bolt | Steel | Plain | 5/8-11 x 2 1/2 | 5/8-11x2 1/2 square machine bolt plain | 2.500 |
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| Kanebridge | IL | Square Head Bolt | Steel | Plain | 3/4-10 x 2 1/2 | 3/4-10x2 1/2 square machine bolt plain | 1.500 |
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| SRF | AL | Square Head Bolt | Grade 2 | Galvanized | 3/8-16 x 2 1/2 | square hd bolt | 1,434 |
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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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| OBRIEN | OH | Square Head Bolt | Steel | Plain | 3/8-16 x 2 1/2 | square hd bolt | 338 |
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| OBRIEN | OH | Square Head Bolt | Steel | Plain | 7/8-9 x 2 1/2 | square hd bolt | 43 |
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| THRDFAST | FL | Square Head Bolt | Steel | Galvanized | 5/8-11 x 2 1/2 | square hd bolt hdg b18.2.1 | 100 |
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| THRDFAST | FL | Square Head Bolt | Steel | Plain | 3/8-16 x 2 1/2 | square hd bolt b18.2.1 | 3 |
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| THRDFAST | AL | Square Head Bolt | Steel | Galvanized | 5/8-11 x 2 1/2 | square hd bolt hdg b18.2.1 | 29 |
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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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| GUIDON | NJ | Square Head Bolt | Steel | Plain | 1/2-13 x 2 1/2 | square head machine bolt a307a | 125 |
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| FACCA | Ont | Square Head Bolt | Grade 2 | Plain | 5/8-11 x 2 1/2 | machine bolt square head (no nut) 5/8-11 unc x 2 1/2 long grade 2 low carbon steel plain ansi b18.2.1 b18.2.1 | 11,760 |
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| Wurth | IN | Square Head Bolt | Grade 5 | Plain | 3/4-10 x 2 1/2 | 3/4-10 x 2-1/2 square hd mach bolt gr5 less nut | 225 |
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| FMP | MA | Square Head Bolt | Steel | Zinc/Clear | 5/8-11 x 2 1/2 | square bolt |
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| FMP | MA | Square Head Bolt | Steel | Plain | 1/2-13 x 2 1/2 | square bolt |
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| FMP | MA | Square Head Bolt | Steel | Plain | 1-8 x 2 1/2 | square bolt | 28 |
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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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| Valley Nu | WA | Square Head Bolt | Steel | Plain | 5/8-11 x 2 1/2 | nc square bolt pl | 60 |
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| Valley Nu | WA | Square Head Bolt | Grade 5 | Plain | 3/4-10 x 2 1/2 | nc gr5 square bolt pl | 153 |
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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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| Valley Nu | WA | Square Head Bolt | Steel | Plain | 7/8-9 x 2 1/2 | nc square bolt pl | 35 |
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| ACCURATE | IL | Square Head Bolt | Steel | Zinc/Clear | 5/8-11 x 2 1/2 | square m/b | 600 |
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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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| ACCURATE | IL | Square Head Bolt | Steel | Plain | 3/4-10 x 2 1/2 | square m/b | 300 |
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| ACCURATE | IL | Square Head Bolt | Steel | Zinc/Clear | 1/2-13 x 2 1/2 | square m/b | 1,200 |
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| ACCURATE | IL | Square Head Bolt | Steel | Plain | 5/8-11 x 2 1/2 | 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 | Plain | 7/8-9 x 2 1/2 | square m/b | 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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| QFS | MI | Square Head Bolt | 300 Stainless (A1,A2, 18-8,304,310 etc.) | Plain | 1/2-13 x 2 1/2 | Square head set screw cup point STAINLESS STEEL | 50 |
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