System of Measurement Inch Heavy Hex Bolt Head Type - Bolts Hex Basic Material Steel Material Grade A307B Fastener Finish Plain Dia./Thread Size 1-1/8 In.-7 Fastener Length 4 in Fastener Thread Direction Right Hand Fastener Thread Type UNC (Coarse) Fastener Industry Standards ASME B18.2.1 Min Thread Length 2 1/2 in Fastener Thread Style Partially Threaded Head Height 3/4 in Head Width 1 13/16 in Package Quantity 5