Shoulder Screw, Shoulder Screw Type Standard Shoulder Screw, Head Type Standard, Drive Type Socket, Material Stainless Steel, Material Grade/Class 18-8, Finish Plain, System of Measurement Inch, Thread Size 5/16 In.-18, Minimum Thread Length 1/2 in, Shoulder Length 1 1/4 in, Shoulder Length Tolerance +/-0.005 in, Shoulder Diameter 3/8 in, Shoulder Diameter Tolerance -0.002 in to -0.004 in, Pack Size Small Pack, Head Height 1/4 in, Head Diameter 9/16 in, Dimensional Standards ASME B18.3