5/16" - 18 Taper (Starting) Tap, High Speed Steel - National Coarse Thread
Model #: TAT-5/16-18
- Thread Diameter: 5/16"
- Threads per Inch: 18
- High Speed Steel. Ground Thread.
- Taper Style (the style of hand tap with the most lead, for starting threads).
Taper taps have a long lead (5-6 threads) for starting a thread.