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3 1/2 inch length Square Head Bolts (ASME B18. 2.1)

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 .

26 results, (click on any line for more information)
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SupplierLocTypeMaterialFinishSizeDescriptionQty 
BIG BOLTILSquare Head Bolt300 Stainless (A1,A2, 18-8,304,310 etc.)Plain5/16-18 x 3 1/2bolt & c/s square bolt300 (a1 a2 18-8 304 310 etc.)square b18.2.11000
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BIG BOLTILSquare Head BoltGrade 8Plain7/16-14 x 3 1/2bolt & c/s square boltsquare b18.2.11000
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BIG BOLTILSquare Head BoltGrade 5Plain5/8-11 x 3 1/2bolt & c/s square boltsquare b18.2.11318
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BIG BOLTILSquare Head BoltGrade 8Plain7/16-20 x 3 1/2bolt & c/s square boltsquare b18.2.11000
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BIG BOLTILSquare Head Bolt300 Stainless (A1,A2, 18-8,304,310 etc.)Plain5/8-11 x 3 1/2bolt & c/s square bolt300 (a1 a2 18-8 304 310 etc.)square b18.2.1500
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ASMCILSquare Head BoltGrade AGalvanized1/4-20 x 3 1/2a307 gra square hd m/b low carb hdg b18.2.1350
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ASMCILSquare Head BoltGrade AGalvanized3/8-16 x 3 1/2a307 gra square hd m/b low carb hdg b18.2.1250
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ASMCILSquare Head BoltGrade AZinc/Clear3/4-10 x 3 1/2a307 gra square hd m/b low carb zp b18.2.160
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JET FITTINGCASquare Head BoltGrade APlain5/8-11 x 3 1/25/8-11x3 1/2 a307 gr a square hd bolt p 747248 b18.2.182
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JET FITTINGCASquare Head BoltGrade APlain5/16-18 x 3 1/25/16-18x3 1/2 a307 gr a square hd bolt 747061 b18.2.1320
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JET FITTINGCASquare Head BoltGrade APlain1/2-13 x 3 1/21/2-13x3 1/2 a307 gr a square hd bolt p 747182 b18.2.17
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CascadeORSquare Head BoltSteelPlain3/4-10 x 3 1/2square m/b b18.2.157
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B & K FASTPASquare Head BoltSteelPlain1/2-13 x 3 1/21/2-13 x 3 1/2 square bolts plain b18.2.18
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B & K FASTPASquare Head BoltSteelPlain7/8-9 x 3 1/27/8-9 x 3 1/2 square bolts plain b18.2.1523
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B & K FASTPASquare Head BoltGrade 8Plain1-8 x 3 1/21-8 x 3 1/2 square bolts gr 8 plain b18.2.12
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B & K FASTPASquare Head BoltSteelPlain1-8 x 3 1/21-8 x 3 1/2 square bolts plain b18.2.1305
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B & K FASTPASquare Head BoltSteelPlain5/8-11 x 3 1/25/8-11 x 3 1/2 square bolts plain b18.2.1323
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Bostwick INSquare Head BoltGrade 8Plain1 1/4-7 x 3 1/21 1/4-7 x 3 1/2 square hd bolt full thread gr 8 b18.2.12
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JET FITTINGCASquare Head BoltGrade APlain5/16-18 x 3 1/25/16-18x3-1/2 (pt) square bolt steel a307 plain b18.2.1500
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JET FITTINGCASquare Head BoltGrade APlain1/2-13 x 3 1/21/2-13x3-1/2 (pt) square bolt steel a307 plain b18.2.154
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JET FITTINGCASquare Head BoltGrade APlain5/8-11 x 3 1/25/8-11x3-1/2 (pt) square bolt steel a307 plain b18.2.195
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THRDFASTFLSquare Head BoltSteelPlain1/2-13 x 3 1/2square hd bolt b18.2.1145
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THRDFASTFLSquare Head BoltSteelPlain1/2-13 x 3 1/2square hd bolt b18.2.18
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KBSTNSquare Head BoltGrade 8Plain1-8 x 3 1/21-8 x 3 1/2 square mach bolt gr-8 b18.2.120
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KBSTNSquare Head BoltGrade 5Plain5/8-11 x 3 1/25/8-11 x 3 1/2 square mach.bolt gr-5 b18.2.13
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KBSTNSquare Head BoltGrade 8Plain3/4-10 x 3 1/23/4-10 x 3 1/2 square mach bolt gr-8 b18.2.189
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