#4 - 40 Taper (Starting) Tap, High Speed Steel - National Coarse Thread
Model #: TAT-4-40
- Thread Diameter: #4
- Threads per Inch: 40
- High Speed Steel. Ground Thread.
- Taper Style (the style of hand tap with the most lead, for starting threads).
- Recommended Drill Size: #43
Taper taps have a long lead (5-6 threads) for starting a thread.