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1/4"-18 NPS Straight Pipe Tap, High Speed Steel
Size-Thread: 1/4 - 18
Often used in light fixtures and lamps.
Straight Pipe Tap - NOT tapered.
High Speed Steel. Ground Threads.
Approximate Thread Diameter: .54"
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.