Machine Screw Head Type Pan Material Steel Finish Zinc Plated Drive Phillips Thread Size #4-40 Fastener Length 1/4 in Head Width 0.219 in Head Height 0.068 in Drive Size #1 Dimensional Standards ASME B18.13 Pack Size Small Type Machine Screw Washer Outside Diameter 0.268 in Washer Thickness 0.018 in System of Measurement Inch Thread Type Coarse Package Quantity 100