1 3/8 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 .

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SupplierLocTypeMaterialFinishSizeDescriptionQty 
Zoro Tools Inc.Square Head BoltSteelPlain1 3/8-61-3/8-6 carbon steel square bolt die
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Buy Square Head Bolts from one of our FCH Network Members
B & K FASTPASquare Head BoltSteelPlain1 3/8-6 x 161 3/8-6 x 16 square bolts plain b18.2.12
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JacksonMSSquare Head BoltGrade 8Plain1 3/8-6 x 6 1/2nc square bolt gr. 86
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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 5Plain1 3/8-12 x 12bolt & c/s square boltb18.2.1200
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BIG BOLTILSquare Head BoltGrade 5Plain1 3/8-12 x 20bolt & c/s square boltb18.2.1200
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BIG BOLTILSquare Head BoltGrade 5Plain1 3/8-12 x 16bolt & c/s square boltb18.2.1200
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BIG BOLTILSquare Head BoltSteelPlain1 3/8-6 x 4bolt & c/s square boltb18.2.11312
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BIG BOLTILSquare Head BoltGrade 5Plain1 3/8-6 x 14bolt & c/s square boltsquare b18.2.1212
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BIG BOLTILSquare Head BoltSteelPlain1 3/8-6 x 8bolt & c/s square boltb18.2.1681
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BIG BOLTILSquare Head BoltGrade 5Plain1 3/8-12 x 18bolt & c/s square boltb18.2.1200
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BIG BOLTILSquare Head BoltGrade 8Plain1 3/8-6 x 12bolt & c/s square boltsquare b18.2.1150
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BIG BOLTILSquare Head BoltSteelPlain1 3/8-6 x 10bolt & c/s square boltb18.2.1436
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BIG BOLTILSquare Head BoltSteelPlain1 3/8-6 x 6bolt & c/s square boltb18.2.1891
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BIG BOLTILSquare Head BoltGrade 5Plain1 3/8-12 x 14bolt & c/s square boltb18.2.1200
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