ZELX TI 4-40 H3 Spiral Flute Bottom Tap Manufacture: YMW Mfg Part Number: 387601 Size: (Inch) Thread Limit: H2 Number of Flutes: 3 Flute Style: Spiral Chamfered: Mod Bottom Thread Lead: 3 to 4 Finish/Coating: Black Oxide Tap Material: PM High Speed Steel Oversize: (Yes/No) No Length of Thread: .236 Overall Length: (Inch) 1-7/8 Thread Standard: UNC Tapping Materials: Titanium Alloys, Magnesium, Beryllium Copper Tapping Stainless Steel: 12-70 SFM Tapping Alloy Steels: 10-45 SFM, Tapping Ductile Iron: 15-60 SFM