Thumb Screw Quarterturn Type Quarterturn Screw Finish Black Oxide Material Steel Thread Size 1/4 In.-20 Fastener Length 1 3/4 in Thread Style Partially Threaded Head Width 0.75 in Head Height 0.625 in Tensile Strength 57 000 psi Head Type Spade Maximum Head Height 0.625 in System of Measurement Inch For Use in Systems Jig and Fixture Component Head Material Steel Head Shape Spade