1/2"-13 x 4" ASTM F593 316 Stainless Steel Tap Bolt / THREAD CLASS: 2A THREAD DIRECTION: RIGHT-HAND THREAD LENGTH: 4.000 INCHES NOMINAL FASTENER LENGTH: 4.000 INCHES NOMINAL HEAD STYLE: C1 HEXAGON HEAD HEIGHT: 0.312 INCHES NOMINAL WIDTH BETWEEN FLATS: 0.750 INCHES NOMINAL END ITEM IDENTIFICATION: CVN 77 COMPOSITE MAIN MAST NOMINAL THREAD DIAMETER: 0.500 INCHES THREAD QUANTITY PER INCH: 13 PART NAME ASSIGNED BY CONTROLLING AGENCY: TYPE 316 STAINLESS STEEL HEX HEAD CAP SCREW MATERIAL: STEEL COMP 316 OVERALL THREAD SERIES DESIGNATOR: UNC