3/8"-16 x 1" ASTM F835 Hex Drive Zinc Finish Alloy Steel Flat Socket Cap Screw / FASTENER LENGTH: 1.000 INCHES NOMINAL HEAD STYLE: C50 FLAT COUNTERSUNK INTERNAL DRIVE STYLE: D5 HEXAGON END ITEM IDENTIFICATION: 2355-01-567-4930 NOMINAL THREAD DIAMETER: 0.375 INCHES WIDTH ACROSS FLATS: 0.2188 INCHES NOMINAL THREAD QUANTITY PER INCH: 16 PART NAME ASSIGNED BY CONTROLLING AGENCY: FLAT SOCKET CAP SCREW, ZINC FINISH MATERIAL: STEEL OVERALL SURFACE TREATMENT: ZINC OVERALL THREAD SERIES DESIGNATOR: UNC