1/2"-13 x 1-1/4" ASTM A574 Hex Drive Zinc Finish Alloy Steel Socket Cap Screw / FASTENER LENGTH: 1.250 INCHES NOMINAL INTERNAL DRIVE STYLE: D5 HEXAGON NOMINAL THREAD DIAMETER: 0.500 INCHES WIDTH ACROSS FLATS: 0.375 INCHES NOMINAL THREAD QUANTITY PER INCH: 13 SPECIAL FEATURES: SOCKET HEAD MATERIAL: STEEL OVERALL SURFACE TREATMENT: ZINC OVERALL