Thumb Screw Quarterturn Type Quarterturn Screw Finish Black Oxide Material Steel Thread Size 1/2 In.-13 Fastener Length 2 1/4 in Thread Style Partially Threaded Head Width 1.25 in Head Height 1 in Tensile Strength 57 000 psi Head Type Spade Maximum Head Height 1 in System of Measurement Inch For Use in Systems Jig and Fixture Component Head Material Steel Head Shape Spade