Shoulder Screw Standard 18-8 Stainless Steel Head Style Socket Thread Size 5/8-11 Drive Type Hex Drive Size 3/8 In Shoulder Dia 0.746-0.748 In Shoulder Length 3 1/2 In Thread Length 7/8 In Head Dia 1 In Head Height 1/2 In Shoulder Length Tolerance 0.010 In Min In Tensile Strength 70 000 PSI Rockwell Hardness B55 Package 2