Machine Screw Head Type Pan Material Nylon Finish Plain Drive Slotted Thread Size 1/4 In.-20 Fastener Length 1 1/2 in Head Width 0.484 in Head Height 0.125 in Pack Size Small Minimum Thread Length 1 1/2 in Type Standard Machine Screw Washer Outside Diameter Not Applicable Washer Thickness Not Applicable Maximum Head Width 0.484 in Minimum Head Width 0.483 in Maximum Head Height 0.125 in Minimum Head Height 0.137 in System of Measurement Inch Thread Style Fully Threaded