5/8" - 18 High Speed Steel Taper (Starting) Tap- National Fine Thread
Model #: TAT-5/8-18
- Thread Diameter: 5/8"
- 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.