1/2"-13 x 1-1/2" ASTM F835 Hex Drive Zinc Finish Alloy Steel Button Socket Cap Screw / THREAD CLASS: 3A FASTENER LENGTH: 1.50 INCHES NOMINAL HEAD STYLE: A21 BUTTON HEAD DIAMETER: 0.851 INCHES MINIMUM AND 0.875 INCHES MAXIMUM HEAD HEIGHT: 0.245 INCHES MINIMUM AND 0.265 INCHES MAXIMUM WIDTH BETWEEN FLATS: 0.3125 INCHES MINIMUM AND 0.3160 INCHES MAXIMUM NOMINAL THREAD DIAMETER: 0.50 INCHES THREAD QUANTITY PER INCH: M13 PART NAME ASSIGNED BY CONTROLLING AGENCY: ASTM F835 HEX DRIVE ZINC FINISH ALLOY STEEL BUTTON SOCKET CAP SCREW SCREW MATERIAL: STEEL SCREW SURFACE TREATMENT: ZINC HEAD HOLE CONFIGURATION STYLE: C10 ROUND INTERNAL HEXAGON SPECIAL FEATURES: DRIVE SIZE 5/16 INCHES;MATERIAL STEEL ALLOY;ROHS COMPLIANT;ASTM F835;COARSE THREAD;WEIGHT 0.0921 LBS;USED ON WIDER BEARING SURFACE FOR MORE FINISHED APPEARANCE;DESIGNED FOR LIGHT FASTENING OPERATIONS;NOT AS STRONGAS REGULAR SOCKET HEAD CAP SCREWS;NOT RECOMMENDED FOR CRITICAL HIGH-STRENGTH APPLICATIONS THREAD SERIES DESIGNATOR: UNRC