#4-40 Machine Screw, Round, Slotted, 18-8 (304) Stainless Steel, Plain, 1/2 in Length, PK 100/ THREAD CLASS: 2A THREAD DIRECTION: RIGHT-HAND THREAD LENGTH: 0.425 INCHES MINIMUM FASTENER LENGTH: 0.500 INCHES NOMINAL HEAD STYLE: A28 ROUND HEAD DIAMETER: 0.193 INCHES MINIMUM AND 0.211 INCHES MAXIMUM HEAD HEIGHT: 0.075 INCHES MINIMUM AND 0.086 INCHES MAXIMUM INTERNAL DRIVE STYLE: B10 SLOT END ITEM IDENTIFICATION: 6150-01-633-6567 NOMINAL THREAD DIAMETER: 0.112 INCHES THREAD QUANTITY PER INCH: 40 PART NAME ASSIGNED BY CONTROLLING AGENCY: MACHINE SCREW WITH ROUND HEAD TYPE SCREW MATERIAL: STEEL COMP 302 AND STEEL COMP 304 THREAD SERIES DESIGNATOR: UNC