Machine Screw, Head Type Flat, Material Brass, Finish Plain, Drive Slotted, Thread Size 1/4 In.-20, Fastener Length 1 in, Head Width 0.477 in, Head Height 0.153 in, Tensile Strength 60,000 psi, Dimensional Standards ASME B18.6.3, Pack Size Small, Type Standard Machine Screw, Maximum Head Width 0.477 in, Minimum Head Width 0.442 in, System of Measurement Inch, Thread Type Coarse, Package Quantity 50