#4-40 x 1/2" ASTM A574 Hex Drive Black Oxide Finish Alloy Steel Socket Cap Screw / THREAD CLASS: 3A THREAD DIRECTION: RIGHT-HAND THREAD LENGTH: 0.470 INCHES MINIMUM AND 0.500 INCHES MAXIMUM FASTENER LENGTH: 0.470 INCHES MINIMUM AND 0.500 INCHES MAXIMUM HEAD STYLE: C48 FLAT FILLISTER HEAD DIAMETER: 0.176 INCHES MINIMUM AND 0.183 INCHES MAXIMUM HEAD HEIGHT: 0.108 INCHES MINIMUM AND 0.112 INCHES MAXIMUM INTERNAL DRIVE STYLE: D5 HEXAGON END ITEM IDENTIFICATION: 01-579-6850 NOMINAL THREAD DIAMETER: 0.112 INCHES WIDTH ACROSS FLATS: 0.0937 INCHES MINIMUM AND 0.0952 INCHES MAXIMUM THREAD QUANTITY PER INCH: 40 COLOR: BLACK OVERALL MATERIAL: STEEL CORROSION RESISTING OVERALL SURFACE TREATMENT: OXIDE OVERALL THREAD SERIES DESIGNATOR: UNRC