3-1/2"-8 NPS Straight Pipe Tap, High Speed Steel
Model #: NPS-3-1/2
- Size-Thread: 3-1/2 - 8
- Straight Pipe Tap - NOT tapered.
- High Speed Steel. Ground Threads.
- Makes a thread for standard "3-1/2" Pipe" - the actual thread dimension is greater than 3-1/2".
Often used in light fixtures and lamps.
The "pipe size" listed (such as 1/2"-14) gives the inside diameter of the pipe this tool is intended to thread a hole to accept the outside of, followed by the threads per inch the tap will cut.