5/16"-18 x 1" ASTM A574 Hex Drive Black Oxide Finish Alloy Steel Socket Cap Screw / THREAD DIRECTION: RIGHT-HAND INTERNAL DRIVE STYLE: D5 HEXAGON END ITEM IDENTIFICATION: MINE PROTECTED CLEARANCE VEHICLE NSN 2355-01-567-4930 PART NAME ASSIGNED BY CONTROLLING AGENCY: 5/16-18X1 ALLOY PLAIN FINISH SOCKET HEAD CAP SCREW COLOR: BLACK OVERALL MATERIAL: STEEL OVERALL SURFACE TREATMENT: OXIDE OVERALL