When does 1" never measure 1"? Answer: when we are working with pipe threads.
- NPT threads are tapered. The taper improves sealing.
- NPT pipe thread sizes do not correspond to actual inch measurements. For example a 1” NPT Pipe Thread has a diameter of approximately 1.315”.
- Please measure the actual diameter of the thread you need and compare it to the specs on this ad before you order.