Machine Screw Head Type Fillister Material Steel Finish Zinc Plated Drive Slotted Thread Size 1/4 In.-20 Fastener Length 1/2 in Head Width 0.414 in Head Height 0.237 in Tensile Strength 60 000 psi Dimensional Standards ASME B1.1 Pack Size Small Type Standard Machine Screw Washer Thickness - System of Measurement Inch Thread Type Coarse Package Quantity 100