Machine Screw Head Type Fillister Material Nylon Finish Plain Drive Slotted Thread Size 1/4 In.-20 Fastener Length 2 in Head Width 0.406 in Head Height 0.219 in Tensile Strength 312 psi Pack Size Small Minimum Thread Length 2 in Type Standard Machine Screw Washer Outside Diameter Not Applicable Washer Thickness Not Applicable Maximum Head Width 0.406 in Minimum Head Width 0.402 in Maximum Head Height 0.219 in Minimum Head Height 0.222 in System of Measurement Inch