ZELX SS 3/8-18 NPS Straight Pipe Tap General Purpose 3/8-18 NPS 4 Flute Straight Pipe Tap Manufacture: YMW Mfg Part Number: 383304 Size: (NPS) Number of Flutes: 4 Flute Style: American Pipe Thread Lead: 2-1/2 to 3-1/2 Finish/Coating: Black Oxide Tap Material: Vanadium High Speed Steel Oversize: (Yes/No) No Length of Thread: 1-1/16 Overall Length: (Inch) 2-9/16 Thread Standard: Straight Pipe Tapping Materials: Steels and Ductile Iron Tapping Steels: 15-18 SFM, Tapping Ductile Iron: 10-15 SFM