Machine Screw, Head Type Truss, Material 18-8 Stainless Steel, Finish Plain, Drive Phillips, Thread Size 1/4 In.-20, Fastener Length 1/2 in, Head Width 0.477 in, Head Height 0.15 in, Drive Size #3, Tensile Strength 60,000 psi, Dimensional Standards ASME B18.6.3, Pack Size Small, Minimum Thread Length 31/64 in, Type Standard Machine Screw, Maximum Head Width 0.477 in, Minimum Head Width 0.442 in, Maximum Head Height 0.15 in, Minimum Head Height 0.133 in, System of Measurement Inch