Machine Screw Head Type Flat Material 18-8 Stainless Steel Finish NL-19 Drive Phillips Thread Size 1/4 In.-20 Fastener Length 1 in Head Width 0.477 in Head Height 0.153 in Drive Size #3 Dimensional Standards ASME B18.6.3 Pack Size Small Minimum Thread Length 1 in Type Standard Machine Screw Maximum Head Width 0.477 in Minimum Head Width 0.477 in Maximum Head Height 0.153 in Minimum Head Height 0.153 in System of Measurement Inch Thread Style Fully Threaded