Zelx HP M8 X 1.25 D9 Roll Form Bottom Tap Manufacture YMW Mfg Part Number 386204 Size (Metric) Thread Limit D9 Number of Lobe Grooves 3 Chamfered Bottom Lead 1 to 2 Finish/Coating TiCN Material Vanadium High Speed Steel Oversize (Yes/No) No Length of Thread .866 Overall Length (Inch) 3.543 Thread Standard UNF Tapping Materials: Wrought Aluminum Alloys Copper Zinc Alloys Tapping Aluminum: 95-125 SFM Tapping Copper: 35-80 SFM, Tapping Brass: 50-70 SFM