5/16"-18, Hex Head Cap Screw, 1/2 in Fastener Length 18-8, Stainless Steel, PK 100/ THREAD CLASS: 2A THREAD DIRECTION: RIGHT-HAND THREAD LENGTH: 0.500 INCHES MINIMUM FASTENER LENGTH: 0.500 INCHES NOMINAL HEAD STYLE: C1 HEXAGON HEAD HEIGHT: 0.195 INCHES MINIMUM AND 0.211 INCHES MAXIMUM WIDTH BETWEEN FLATS: 0.489 INCHES MINIMUM AND 0.500 INCHES MAXIMUM END ITEM IDENTIFICATION: 6150-01-633-6567 NOMINAL THREAD DIAMETER: 0.312 INCHES THREAD QUANTITY PER INCH: 18 PART NAME ASSIGNED BY CONTROLLING AGENCY: HEX HEAD CAP SCREW MATERIAL: STEEL COMP 302 OVERALL AND STEEL COMP 304 THREAD SERIES DESIGNATOR: UNC