1"-8 x 4" A307 Grade A Square Head Machine Bolt Low Carbon Steel Hot Dip Galvanized

PRODUCT SPECIFICATIONS (Part # 0000-131589)
Fastener Type:	Square Head Machine Bolt
Size Description:	1"-8 x 4"
Diameter/Nominal Size:	1"
Length:	4"
Wrench Size/Across Flats:	1.450-1.500"
Width Across Corners:	1.991-2.121"
Head Height:	0.628-0.684"
Thread Pitch:	8
Thread Direction:	Right
System of Measurement:	Inch
Grade:	A (2)
Material:	Low Carbon Steel
Finish:	Hot Dip Galvanized
Head Type:	Square
Drive Type:	External Square
Standards Met:	A307
Average Piece Weight:	1.1241000 lbs.

Square head bolts, or square head machine bolts offer a large bearing area for positive gripping; primarily used nowadays for aesthetic projects that create a rustic look or to match existing fasteners; comes in both fully threaded and partially threaded pitches. Square head bolts are sometimes selected over hex heads because the head will fit neatly in a channel.