Inch Tower Bolt Steel Fastener Finish Hot Dipped Galvanized Dia/Thread Size 5/8 In.-11 Fastener Length 1 3/4 in Fastener Thread Type UNC (Coarse) Fastener Industry Standards ASTM A394 Thread Length 1 3/4 in Fastener Thread Direction Right Hand Head Dia 15/16 in Head Height 27/64 in Tensile Strength (PSI) 74 000 psi Rockwell Hardness HRB80 Package Quantity 10