Machine Screw Head Type Round Material Nylon Finish Plain Drive Slotted Thread Size #4-40 Fastener Length 3/8 in Head Width 0.078 in Head Height 0.203 in Tensile Strength 41 psi Pack Size Small Minimum Thread Length 3/8 in Type Standard Machine Screw Washer Outside Diameter Not Applicable Washer Thickness Not Applicable Maximum Head Width 0.078 in Minimum Head Width 0.081 in Maximum Head Height 0.203 in Minimum Head Height 0.202 in System of Measurement Inch