ItemShoulder Screw MaterialAlloy Steel FinishPlain Head StyleKnurled System of MeasurementInch Thread Size1/4-20 Drive TypeHex Socket Drive Size5/32" Shoulder Dia.5/16" Shoulder Length3/8" Thread Length7/16" Head Dia.7/16" Head Height7/32" Screw Head Height0.209 to 0.219 Shoulder Length Tolerance+/-0.005" Screw Head Dia.0.419 to 0.438 Min. Tensile Strength (PSI)140000 Shear Strength (PSI)84000 Class3A Rockwell Hardness32 to 43 HRC Meets/ExceedsASME B18.3 Package Quantity25GRAINGER APPROVED