1/2"-13 x 1-1/2" ASTM F835 Hex Drive Zinc Finish Alloy Steel Flat Socket Cap Screw / THREAD DIRECTION: RIGHT-HAND THREAD LENGTH: 1.500 INCHES MINIMUM FASTENER LENGTH: 1.500 INCHES MINIMUM HEAD STYLE: C50 FLAT COUNTERSUNK NOMINAL THREAD DIAMETER: 0.500 INCHES THREAD QUANTITY PER INCH: 13 MATERIAL: STEEL CORROSION RESISTING OVERALL SURFACE TREATMENT: ZINC OVERALL THREAD SERIES DESIGNATOR: UNC