#4-40 x 1/2" Hex - Unslotted Drive Indented Hex Head Grade 18-8 Stainless Steel Machine Screw / THREAD CLASS: 2A THREAD DIRECTION: RIGHT-HAND THREAD LENGTH: 0.500 INCHES NOMINAL FASTENER LENGTH: 0.500 INCHES NOMINAL HEAD STYLE: C1 HEXAGON HEAD HEIGHT: 0.1094 INCHES NOMINAL WIDTH BETWEEN FLATS: 0.2756 INCHES NOMINAL END ITEM IDENTIFICATION: MRAP - COUGAR NOMINAL THREAD DIAMETER: 0.112 INCHES THREAD QUANTITY PER INCH: 40 PART NAME ASSIGNED BY CONTROLLING AGENCY: MACHINE SCREW MATERIAL: STEEL CORROSION RESISTING OVERALL THREAD SERIES DESIGNATOR: UNC