BBI 711249 Semi-Standard Shoulder Screw, 1/2-13, 5/16 in Hex Socket Drive, Alloy Steel
BBI Shoulder Screw, Semi-Standard, 1/2-13 Screw, Round Head, Hex Socket Drive, 5/16 in Drive, UNC, 5/8 in Shoulder Dia, 6-1/2 in Shoulder Length, HRC 36 - 43 Hardness, Alloy Steel, Plain