Self Locking Thread Insert Compatible Material Metal Compatible Tap Size 5/8 In.-18 Drill Bit Size 37/64 External Thread Fit 2A External Thread Size 5/8 In.-18 Finish Black Phosphate Insert Diameter 5/8 in Internal Thread Fit 2B Internal Thread Size M12-1.25 Material Steel Material Grade/Class 12L14 Maximum Hole Diameter 0.578 in Minimum Installation Depth 13/16 in Overall Length 18 mm System of Measurement Inch/Metric Thread Direction Right Hand Thread Type Coarse