1/2"-13 x 3-1/2" Grade 5 Zinc Finish Hex Cap Screw - Made in USA / THREAD DIRECTION: RIGHT-HAND FASTENER LENGTH: 3.500 INCHES NOMINAL HEAD STYLE: C1 HEXAGON WIDTH BETWEEN FLATS: 0.750 INCHES NOMINAL END ITEM IDENTIFICATION: NSN 4940-01-591-0265 NOMINAL THREAD DIAMETER: 0.500 INCHES THREAD QUANTITY PER INCH: 13 PART NAME ASSIGNED BY CONTROLLING AGENCY: CAP SCREW MATERIAL: STEEL OVERALL SURFACE TREATMENT: ZINC OVERALL THREAD SERIES DESIGNATOR: UNC