1/2"-13 x 1-3/4" ASTM F835 Hex Drive Zinc Finish Alloy Steel Button Socket Cap Screw / THREAD CLASS: 2B THREAD DIRECTION: RIGHT-HAND THREAD LENGTH: 1.69 INCHES MINIMUM AND 1.75 INCHES MAXIMUM FASTENER LENGTH: 1.69 INCHES MINIMUM AND 1.75 INCHES MAXIMUM HEAD STYLE: C32 PAN HEAD DIAMETER: 0.851 INCHES MINIMUM AND 0.875 INCHES MAXIMUM HEAD HEIGHT: 0.245 INCHES MINIMUM AND 0.265 INCHES MAXIMUM INTERNAL DRIVE STYLE: D5 HEXAGON END ITEM IDENTIFICATION: 2541-01-561-0937 NOMINAL THREAD DIAMETER: 0.50 INCHES WIDTH ACROSS FLATS: 0.3125 INCHES MINIMUM AND 0.3160 INCHES MAXIMUM THREAD QUANTITY PER INCH: 13 PART NAME ASSIGNED BY CONTROLLING AGENCY: BHCS 1/2 MATERIAL: STEEL OVERALL MATERIAL DOCUMENT AND CLASSIFICATION: ASTM F835 NATIONAL STD/SPEC SINGLE MATERIAL RESPONSE OVERALL SURFACE TREATMENT: ZINC OVERALL THREAD SERIES DESIGNATOR: UNC