Shoulder Screw Standard 316 Stainless Steel Head Style Socket Thread Size 5/16-18 Drive Type Hex Drive Size 3/16 In Shoulder Dia 3/8 In. Shoulder Length 1 3/4 In Thread Length 1/2 In Head Dia 9/16 In Head Height 1/4 In Shoulder Length Tolerance 0.010 In Min In Tensile Strength 70 000 PSI Rockwell Hardness B55 Package 2