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Square Head Bolts, Black Oxide

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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Buy Square Head Bolts from one of our FCH Network Members
SupplierLocTypeMaterialFinishSizeDescriptionQty 
AmericanNYSquare Head BoltSteelBlack Oxide1/4-20 x 3/4square m/b black ox5150
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AmericanNYSquare Head BoltSteelBlack Oxide3/8-16 x 2square hd m/b black ox2380
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AmericanNYSquare Head BoltSteelBlack Oxide3/8-16 x 4 1/2square hd m/b black ox10
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CIFILSquare Head BoltGrade 8Black Oxide5/8-11 x 1 1/25/8-11x1 1/2 square head machine bolt grade 8 black oxide with wkw headmark (5859) (5859)5859
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WDMBIASquare Head BoltGrade 5Black Oxide12.7 x 88 x 78.7e/blt u sq gr5 black 12.7x88x78.7 drw (W020) (W020)240
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GUIDONNJSquare Head BoltGrade 2Black Oxide3/8-16 x 3A307A450
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BRIGHBESTILSquare Head BoltSteelBlack Oxide1 1/2-6 x 31 1/2-6 x 3 sq hd black oxide28
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