5/8"-11 x 2-1/2" ASTM A574 Hex Drive Zinc Finish Alloy Steel Socket Cap Screw / THREAD CLASS: 2A THREAD DIRECTION: RIGHT-HAND THREAD LENGTH: 1.000 INCHES NOMINAL FASTENER LENGTH: 2.440 INCHES MINIMUM AND 2.500 INCHES MAXIMUM HEAD STYLE: C44 FILLISTER HEAD DIAMETER: 0.921 INCHES MINIMUM AND 0.938 INCHES MAXIMUM HEAD HEIGHT: 0.616 INCHES MINIMUM AND 0.625 INCHES MAXIMUM INTERNAL DRIVE STYLE: D5 HEXAGON END ITEM IDENTIFICATION: 6115-01-572-3944 POWER PLANT, UTILITY NOMINAL THREAD DIAMETER: 0.625 INCHES WIDTH ACROSS FLATS: 0.500 INCHES NOMINAL THREAD QUANTITY PER INCH: 11 PART NAME ASSIGNED BY CONTROLLING AGENCY: SOCKET HEAD CAP SCREW MATERIAL: STEEL OVERALL MATERIAL DOCUMENT AND CLASSIFICATION: ASTM A574 ASSN STD SINGLE MATERIAL RESPONSE OVERALL SURFACE TREATMENT: ZINC OVERALL SURFACE TREATMENT DOCUMENT AND CLASSIFICATION: ASTM F1941 ASSN STD SINGLE TREATMENT RESPONSE OVERALL THREAD SERIES DESIGNATOR: UNRC