@ jej3451 We have some material here: library.automationdirect.com/pneumatic-fitting-tips/ but we may not go in to detail on how to measure tapered threads. A quick web search revealed several resources such as Wikipedia with the following: "The taper rate for all NPT threads is 1 inch of diameter in 16 inches of length (3⁄4 inch per foot or 62.5 millimeters per meter) measured by the change of diameter (of the pipe thread) over distance of thread."
You are correct that the decimal equivalent of 3/8 is 0.375. But pipes are sized by the inside diameter. The outside diameter of NPT threads on a 3/8" pipe is 0.675".
For tapered threads, where do you measure the OD? At the narrow end or the wide end?
@ jej3451 We have some material here: library.automationdirect.com/pneumatic-fitting-tips/ but we may not go in to detail on how to measure tapered threads. A quick web search revealed several resources such as Wikipedia with the following: "The taper rate for all NPT threads is 1 inch of diameter in 16 inches of length (3⁄4 inch per foot or 62.5 millimeters per meter) measured by the change of diameter (of the pipe thread) over distance of thread."
Just what I needed. Thanks!
You're welcome, we are glad our video was helpful! Make sure to check out more of our videos at www.automationdirect.com/videos/home
What is TPI in side of table
TPI = Threads per Inch.
That measurement chart is hella wrong. OD on 3/8 is around .375.
You are correct that the decimal equivalent of 3/8 is 0.375. But pipes are sized by the inside diameter. The outside diameter of NPT threads on a 3/8" pipe is 0.675".