Shoulder Screw Shoulder Screw Type Tamper-Resistant Shoulder Screw Head Type Truss Drive Type Tamper-Resistant Torx Material Stainless Steel Material Grade/Class 18-8 Finish Plain System of Measurement Inch Thread Size 1/4 In.-20 Minimum Thread Length 5/8 in Shoulder Length 1/4 in Shoulder Length Tolerance +/-0.005 in Shoulder Diameter 5/16 in Shoulder Diameter Tolerance -0.004 in to +0.0 in Pack Size Small Pack Head Height 1/4 in Head Diameter 9/16 in