' Shoulder Screw, Alloy Steel, Plain Finish, Head Style Knurled, System of Measurement Inch, Thread Size 3/8-16, Hex Socket Drive Type, Drive Size 1/4 In., Shoulder Dia. 1/2 In., Shoulder Length 4-1/2 In., Thread Length 5/8 In., Head Dia. 3/4 In., Head Height 5/16 In., Screw Head Height 0.302 to 0.312, Shoulder Length Tolerance +/-0.005 In., Screw Head Dia. 0.729 to 0.750, Min. Tensile Strength (PSI) 140000, Shear Strength (PSI) 84000, Class 3A, Rockwell Hardness 32 to 43 HRC '