Machine Screw Head Type Flat Material Nylon Finish Plain Drive Slotted Thread Size 1/4 In.-20 Fastener Length 11/32 in Head Width 0.5 in Head Height 0.156 in Tensile Strength 312 psi Pack Size Small Minimum Thread Length 1/2 in Type Standard Machine Screw Washer Outside Diameter Not Applicable Washer Thickness Not Applicable Maximum Head Width 0.5 in Minimum Head Width 0.507 in Maximum Head Height 0.156 in Minimum Head Height 0.153 in System of Measurement Inch