#8-32 x 3/8" ASTM A574 Hex Drive Black Oxide Finish Alloy Steel Socket Cap Screw / FASTENER LENGTH: 0.544 INCHES NOMINAL HEAD DIAMETER: 0.270 INCHES NOMINAL HEAD HEIGHT: 0.164 INCHES NOMINAL INTERNAL DRIVE STYLE: D5 HEXAGON PART NAME ASSIGNED BY CONTROLLING AGENCY: SOCKET HEAD CAP SCREW SURFACE TREATMENT: OXIDE OVERALL THREAD SERIES DESIGNATOR: UNRC