Machine Screw, Head Type Round, Material Steel, Finish Zinc Plated, Drive Combination Slotted/Phillips, Thread Size 1/4 In.-20, Fastener Length 3 in, Head Width 0.477 in, Head Height 0.175 in, Drive Size #3, Tensile Strength 60,000 psi, Dimensional Standards ASME B18.6.3, Pack Size Bulk, Minimum Thread Length Not Applicable, Type Standard Machine Screw, Washer Outside Diameter Not Applicable, Washer Thickness Not Applicable, Maximum Head Width 0.477 in, Minimum Head Width 0.442 in