1/2"-13 x 1-1/2" ASTM A193 B8 Class 1 Stainless Steel Heavy Hex Cap Screw / THREAD DIRECTION: RIGHT-HAND THREAD LENGTH: 1.500 INCHES NOMINAL FASTENER LENGTH: 1.500 INCHES NOMINAL HEAD STYLE: C1 HEXAGON WIDTH BETWEEN FLATS: 0.875 INCHES NOMINAL END ITEM IDENTIFICATION: F-15SA; LOGISTICS SUPPORT VESSEL NOMINAL THREAD DIAMETER: 0.500 INCHES THREAD QUANTITY PER INCH: 13 PART NAME ASSIGNED BY CONTROLLING AGENCY: HEAVY HEX SCREW MATERIAL: STEEL COMP 304 OVERALL OR STEEL COMP 316 MATERIAL DOCUMENT AND CLASSIFICATION: ASTM A193B8 NATIONAL SPEC SINGLE MATERIAL RESPONSE OVERALL THREAD SERIES DESIGNATOR: UNC