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Square Head Bolts, Grade 5 (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 .

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SupplierLocTypeMaterialFinishSizeDescriptionQty 
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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BIG BOLTILSquare Head BoltGrade 5Plain1-8 x 20bolt & c/s square boltsquare b18.2.1400
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BIG BOLTILSquare Head BoltGrade 5Plain3/4-16 x 16bolt & c/s square boltb18.2.1700
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BIG BOLTILSquare Head BoltGrade 5Plain3/8-16 x 12bolt & c/s square boltsquare b18.2.1500
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BIG BOLTILSquare Head BoltGrade 5Plain7/16-14 x 2 1/2bolt & c/s square boltsquare b18.2.1890
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BIG BOLTILSquare Head BoltGrade 5Plain3/8-16 x 4bolt & c/s square boltsquare b18.2.1500
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BIG BOLTILSquare Head BoltGrade 5Plain5/8-11 x 12bolt & c/s square boltsquare b18.2.1700
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BIG BOLTILSquare Head BoltGrade 5Plain1 1/8-7 x 16bolt & c/s square boltsquare b18.2.1 b18.2.1400
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BIG BOLTILSquare Head BoltGrade 5Plain5/8-11 x 4 1/2bolt & c/s square boltsquare b18.2.13316
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BIG BOLTILSquare Head BoltGrade 5Plain3/4-16 x 20bolt & c/s square boltb18.2.11100
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BIG BOLTILSquare Head BoltGrade 5Plain7/8-9 x 14bolt & c/s square boltsquare b18.2.1566
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BIG BOLTILSquare Head BoltGrade 5Plain1/2-13 x 6bolt & c/s square boltsquare b18.2.110000
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BIG BOLTILSquare Head BoltGrade 5Plain7/8-14 x 20bolt & c/s square boltb18.2.1600
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BIG BOLTILSquare Head BoltGrade 5Plain1/2-13 x 12bolt & c/s square boltsquare b18.2.1500
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BIG BOLTILSquare Head BoltGrade 5Plain1 3/8-6 x 10bolt & c/s square boltsquare b18.2.181
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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 5Plain1/4-20 x 5bolt & c/s square boltsquare b18.2.16000
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BIG BOLTILSquare Head BoltGrade 5Plain5/16-18 x 6bolt & c/s square boltsquare b18.2.14700
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BIG BOLTILSquare Head BoltGrade 5Plain1/2-13 x 10bolt & c/s square boltsquare b18.2.1500
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BIG BOLTILSquare Head BoltGrade 5Plain1/4-20 x 2bolt & c/s square boltsquare b18.2.16000
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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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B & K FASTPASquare Head BoltGrade 5Plain1/2-13 x 1 3/41/2-13 x 1 3/4 square bolts gr 5 plain b18.2.14
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B & K FASTPASquare Head BoltGrade 5Plain1-8 x 51-8 x 5 square bolt gr 5 plain b18.2.112
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B & K FASTPASquare Head BoltGrade 5Plain5/8-11 x 55/8-11 x 5 square bolts gr 5 plain b18.2.110
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B & K FASTPASquare Head BoltGrade 5Plain5/8-11 x 6 1/25/8-11 x 6 1/2 square bolts full thread gr 5 plain b18.2.11
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B & K FASTPASquare Head BoltGrade 5Plain3/4-10 x 63/4-10 x 6 square bolts gr 5 plain b18.2.15
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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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OSSCORISquare Head BoltGrade 5Plain3/4-10 x 33/4-10x3 square hd mach bolt grade 5 b18.2.14
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QFCTXSquare Head BoltGrade 5Zinc/Clear3/4-10 x 53/4-10x5 sq head bolt gr5 zinc b18.2.14
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Bostwick INSquare Head BoltGrade 5Plain1/2-13 x 2 1/21/2-13 x 2 1/2 square hd bolt gr 5 b18.2.176
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Bostwick INSquare Head BoltGrade 5Plain1/2-13 x 21/2-13 x 2 square hd bolt gr 5 b18.2.152
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Bostwick INSquare Head BoltGrade 5Plain3/4-10 x 23/4-10 x 2 square hd bolt gr 5 b18.2.123
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Bostwick INSquare Head BoltGrade 5Plain5/8-11 x 25/8-11 x 2 square hd bolt gr 5 b18.2.112
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Bostwick INSquare Head BoltGrade 5Plain5/8-11 x 1 1/25/8-11 x 1 1/2 square hd bolt gr 5 b18.2.19
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THRDFASTFLSquare Head BoltGrade 5Plain3/8-16 x 2gr5 square hd bolt b18.2.110
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THRDFASTTNSquare Head BoltGrade 5Plain1-8 x 8gr5 square hd bolt b18.2.13
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THRDFASTALSquare Head BoltGrade 5Galvanized3/4-10 x 3gr5 square hd bolt hdg b18.2.12
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KBSTNSquare Head BoltGrade 5Plain1-8 x 5 1/21-8 x 5 1/2 square mach.bolt gr-5 b18.2.112
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KBSTNSquare Head BoltGrade 5Plain1 1/4-7 x 141-1/4-7 x 14 square mach.bolt gr-5 b18.2.12
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KBSTNSquare Head BoltGrade 5Plain1 1/4-7 x 41-1/4-7 x 4 square mach.bolt gr-5 b18.2.110
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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 5Plain7/8-9 x 87/8-9 x 8 square mach.bolt gr-5 b18.2.120
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THRDFASTFLSquare Head BoltGrade 5Plain7/8-9 x 5gr5 square hd bolt b18.2.110
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