Inch Structural Bolt Steel Material Grade A325 Type 1 Fastener Finish Plain Dia/Thread Size 1/2 In.-13 Fastener Length 2 3/4 in Fastener Thread Type UNC (Coarse) Fastener Industry Standards ASTM F3125 Thread Length 1 in Fastener Thread Direction Right Hand Head Dia 7/8 in Head Height 5/16 in Tensile Strength (PSI) 105 000 psi Rockwell Hardness HRC25 Package Quantity 25