Grand Brass Lamp Parts, LLCAnswer
May 03, 2024 - 01:42 PM
IPS is Iron Pipe Straight thread. It's meant to seal on a washer (like the threads the hose for your toilet or faucets attach to).
NPT is a tapered thread, designed to seal on the threads, which is why you put pipe tape on them
With that said, we agree, thread sizes can be absolutely confusing. Perhaps the MOST confusing part of lamp making.
That's why we have created this helpful reference article;
On this fixture 1/8ips = approximately 3/8in inner diameter center hole.
