#4-40 x 1/4" ASTM F835 Hex Drive Black Oxide Finish Alloy Steel Button Socket Cap Screw / THREAD CLASS: 3A THREAD DIRECTION: RIGHT-HAND THREAD LENGTH: 0.22 INCHES MINIMUM AND 0.25 INCHES MAXIMUM FASTENER LENGTH: 0.22 INCHES MINIMUM AND 0.25 INCHES MAXIMUM HEAD STYLE: C30 BUTTON HEAD DIAMETER: 0.201 INCHES MINIMUM AND 0.213 INCHES MAXIMUM HEAD HEIGHT: 0.051 INCHES MINIMUM AND 0.059 INCHES MAXIMUM INTERNAL DRIVE STYLE: D5 HEXAGON END ITEM IDENTIFICATION: 5895-01-564-7999 NOMINAL THREAD DIAMETER: 0.112 INCHES WIDTH ACROSS FLATS: 0.0625 INCHES MINIMUM AND 0.0635 INCHES MAXIMUM THREAD QUANTITY PER INCH: 40 HARDNESS RATING: 39.0 ROCKWELL C MINIMUM OVERALL AND 44.0 ROCKWELL C MAXIMUM PART NAME ASSIGNED BY CONTROLLING AGENCY: NUMBER 4-40X0.25, SOCKET BUTTON HEAD CAP SCREW, ALLOY, BLACK OXIDE COLOR: BLACK OVERALL MATERIAL: STEEL OVERALL MATERIAL DOCUMENT AND CLASSIFICATION: ASTM F835 ASSN STD SINGLE MATERIAL RESPONSE OVERALL SURFACE TREATMENT: BLACK CHEMICAL FINISH OVERALL AND OXIDE THREAD SERIES DESIGNATOR: UNRC