Zelx SS M18 x 1.5 Spiral Fluted HSS D6 Plug Tap Manufacture YMW Mfg Part Number 372632 Size (Metric) Thread Limit D6 Number of Flutes 3 Chamfered Plug Lead 3 to 5 Finish/Coating Black Oxide Material Vanadium High Speed Steel Oversize (Yes/No) No Length of Thread 1.083 Overall Length (Inch) 4-1/32 Thread Standard UNC Tapping Materials: Stainless Steel, Alloy Steels and Ductile Iron Tapping Stainless Steel: 12-70 SFM Tapping Alloy Steels: 10-45 SFM, Tapping Ductile Iron: 15-60 SFM