Spring Pin System of Measurement Inch Pin Diameter 5/16 in Pin Type Coiled Material Steel Material Grade/Class Grade 1070/Grade 1074 Finish Plain Usable Length 4 in End Type Chamfered Chamfer Diameter 0.3039 in Fits Minimum Hole Diameter 5/16 in Fits Maximum Hole Diameter 5/16 in Shank Length 4 in Maximum Chamfer Length 0.08 in Nominal Diameter 5/16 in Standards ASME B18.8.2 Shank Length Tolerance +/-0.025 in Product Type Coiled Spring Pin Rockwell Hardness RC43-52