Self Locking Thread Insert Compatible Material Metal Compatible Tap Size 1/2 In.-13 Drill Bit Size 27/64 in External Thread Fit 2A External Thread Size 1/2 In.-13 Finish Black Phosphate Insert Diameter 1/2 in Internal Thread Fit 2B Internal Thread Size 1/4 In.-20 Material Steel Material Grade/Class 12L14 Maximum Hole Diameter 0.422 in Minimum Installation Depth 9/16 in Overall Length 31/64 in System of Measurement Inch Thread Direction Right Hand Thread Type Coarse