Inch Structural Bolt Steel Material Grade A325 Type 1 A563-C Fastener Finish Plain Dia/Thread Size 1 In.-8 Fastener Length 4 1/4 in Fastener Thread Type UNC (Coarse) Fastener Industry Standards ASTM 563 ASTM F3125 Thread Length 1 3/4 in Fastener Thread Direction Right Hand Head Dia 1 5/8 in Head Height 39/64 in Tensile Strength (PSI) 105 000 psi Rockwell Hardness HRC25 Includes Heavy Nut Package Quantity 5