Zelx SS 4-40 SP SS 2 Flute H2 Bottom Tap Manufacture: YMW Mfg Part Number: 384001 Size: (Inch) Thread Limit: H2 Number of Flutes: 2 Flute Style: Spiral Chamfered: Bottom Thread Lead: 1 to 2 Finish/Coating: Black Oxide Tap Material: Vanadium High Speed Steel Oversize: (Yes/No) No Length of Thread: .236 Overall Length: (Inch) 1-7/8 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