Zelx SS 1/4-28 SP SS 3 Flute H3 Bottom Tap Manufacture: YMW Mfg Part Number: 384014 Size: (Inch) Thread Limit: H3 Number of Flutes: 3 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: .354 Overall Length: (Inch) 2-1/2 Thread Standard: UNF 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