National Pipe Taper Taps (NPT) are appropriate for threading a wide variety of materials both ferrous and non-ferrous. The nominal size of a Pipe Tap is that of the pipe fitting to be tapped, not the actual size of the tap. The thread tapers 3/4 of an inch per foot. All Pipe Taps furnished with a 2-1/2 to 3-1/2 thread chamger. NPT threads require the use of a sealer like teflon tape or pipe compound. 6 Piece High Speed Steel NPT Pipe Tap Set, 1/8, 1/4, 3/8, 1/2, 3/4 and 1 in Wooden Case. National Pipe Taper Taps (NPT) are appropriate for threading a wide variety of materials both ferrous and non-ferrous. The nominal size of a Pipe Tap is that of the pipe fitting to be tapped, not the actual size of the tap. The thread tapers 3/4 of an inch per foot. All Pipe Taps furnished with a 2-1/2 to 3-1/2 thread chamger. NPT threads require the use of a sealer like teflon tape or pipe compound.
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