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3 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 .

43 results, (click on any line for more information)

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SupplierLocTypeMaterialFinishSizeDescriptionQty 
GLFOHSquare Head BoltGrade APlain3/8-16 x 33/8-16x3 square hd bolt a307 stl pln b18.2.1 () () ()28
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GLFOHSquare Head BoltGrade 5Plain3/4-10 x 33/4-10x3 square hd bolt grade 5 stl pln b18.2.1 () () ()79
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GLFOHSquare Head BoltGrade 8Plain3/4-10 x 33/4-10x3 square hd bolt grade 8 stl pln b18.2.1 () () ()5
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BIG BOLTILSquare Head BoltGrade 5Plain3/4-10 x 3bolt & c/s square boltsquare fulthr b18.2.110900
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BIG BOLTILSquare Head BoltSteelPlain5/8-11 x 3bolt & c/s square bolt5/8-11x3square 2.5thd b18.2.18100
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BIG BOLTILSquare Head BoltGrade 8Plain7/16-20 x 3bolt & c/s square boltsquare b18.2.1500
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BIG BOLTILSquare Head BoltGrade 5Plain1/4-20 x 3bolt & c/s square boltsquare b18.2.16000
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BIG BOLTILSquare Head BoltGrade 5Plain5/8-11 x 3bolt & c/s square boltsquare b18.2.13000
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BIG BOLTILSquare Head Bolt300 Stainless (A1,A2, 18-8,304,310 etc.)Plain5/16-18 x 3bolt & c/s square bolt300 (a1 a2 18-8 304 310 etc.)square b18.2.1500
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BIG BOLTILSquare Head Bolt300 Stainless (A1,A2, 18-8,304,310 etc.)Plain5/8-11 x 3bolt & c/s square bolt300 (a1 a2 18-8 304 310 etc.)square b18.2.1500
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BIG BOLTILSquare Head BoltGrade 5Plain1/2-13 x 3bolt & c/s square boltsquare b18.2.15000
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BIG BOLTILSquare Head BoltGrade 5Plain5/16-18 x 3bolt & c/s square boltsquare b18.2.12900
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BIG BOLTILSquare Head BoltGrade 8Plain7/16-14 x 3bolt & c/s square boltsquare b18.2.11500
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BIG BOLTILSquare Head BoltGrade 8Zinc/Yellow3/4-16 x 3bolt & c/s square boltfulthr b18.2.1500
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BIG BOLTILSquare Head BoltSteelPlain5/8-11 x 3bolt & c/s square boltsquare b18.2.19300
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BIG BOLTILSquare Head BoltGrade 8Plain1/2-13 x 3bolt & c/s square boltsquare b18.2.13200
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ASMCILSquare Head BoltGrade AGalvanized5/16-18 x 3a307 gra square hd m/b low carb hdg b18.2.1150
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ASMCILSquare Head BoltGrade APlain1/2-13 x 3(pt) coarse a307 gra square hd m/b low carb b18.2.125
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ASMCILSquare Head BoltGrade AGalvanized5/8-11 x 3a307 gra square hd m/b low carb hdg b18.2.118
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ASMCILSquare Head BoltGrade AGalvanized3/8-16 x 3a307 gra square hd m/b low carb hdg b18.2.1325
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ASMCILSquare Head BoltGrade AGalvanized1/4-20 x 3a307 gra square hd m/b low carb hdg b18.2.1128
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ASMCILSquare Head BoltGrade AZinc/Clear3/4-10 x 3a307 gra square hd m/b low carb zp b18.2.15
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B & K FASTPASquare Head BoltSteelPlain1/2-13 x 31/2-13 x 3 square bolts plain b18.2.1244
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B & K FASTPASquare Head BoltSteelPlain3/4-10 x 33/4-10 x 3 square bolts plain b18.2.1105
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B & K FASTPASquare Head BoltSteelPlain5/8-11 x 35/8-11 x 3 square bolts plain b18.2.111
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B & K FASTPASquare Head BoltGrade 5Plain7/8-9 x 37/8-9 x 3 square bolts gr 5 plain b18.2.125
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B & K FASTPASquare Head BoltSteelPlain7/8-9 x 37/8-9 x 3 square bolts plain b18.2.1314
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OSSCORISquare Head BoltSteelZinc/Clear5/16-18 x 35/16-18x3 square hd mach bolt plated b18.2.1400
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OSSCORISquare Head BoltGrade 5Plain3/4-10 x 33/4-10x3 square hd mach bolt grade 5 b18.2.14
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THRDFASTFLSquare Head BoltSteelGalvanized3/4-10 x 3square hd bolt hdg b18.2.120
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THRDFASTFLSquare Head BoltSteelPlain5/8-11 x 3square hd bolt b18.2.13
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THRDFASTOKSquare Head BoltSteelGalvanized3/4-10 x 3square hd bolt hdg b18.2.160
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THRDFASTOKSquare Head BoltSteelGalvanized7/8-9 x 3square hd bolt hdg b18.2.140
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THRDFASTOKSquare Head BoltSteelGalvanized7/8-9 x 3square hd bolt rt2.25 hdg b18.2.120
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THRDFASTOKSquare Head BoltSteelGalvanized5/8-11 x 3square hd bolt hdg full thread b18.2.17
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THRDFASTALSquare Head BoltGrade 5Galvanized3/4-10 x 3gr5 square hd bolt hdg b18.2.12
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THRDFASTALSquare Head BoltSteelGalvanized5/8-11 x 3square hd bolt hdg b18.2.15
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KBSTNSquare Head BoltGrade 8Plain5/8-11 x 35/8-11 x 3 square!machbolt gr-8 b18.2.1156
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THRDFASTMSSquare Head BoltSteelPlain3/8-16 x 3square hd bolt b18.2.150
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THRDFASTMSSquare Head BoltSteelGalvanized3/4-10 x 3square hd bolt hdg b18.2.18
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THRDFASTMSSquare Head BoltSteelPlain5/8-11 x 3square hd bolt b18.2.115
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THRDFASTOKSquare Head BoltSteelPlain5/8-11 x 3square hd bolt b18.2.11,641
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All SizeTXSquare Head BoltGrade APlain5/8-11 x 35/8-11 x 3 a307 square head bolt plain b18.2.140
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