NPT Thread Gages

National Pipe Thread (NPT) is an angle 60, flat shape, Taper: 1:16- to determine the acceptability. The pipe gauges are used to determine the pitch of a thread on screw in a tapped hole's external threaded parts. NPT pipe gages are considered "General Purpose" pipe thread, which is used between notches where L1 and L3 gages are measured. They also inspect pitch diameter, taper and the wrench tight. 

The taper pipe thread has a L1 distance from a small end. The steps required to flush with the large end, allows the small end to flush within a plus or minus tolerance. It's equal to L1 length for thickness. 

The normal sizes are listed below:

  • 1/16
  • 1/8
  • 1/4
  • 3/8
  • 1/2
  • 3/4
  • 1- 1/4
  • 1- 1/2
  • 2

The NPT gages are:

  • NPT L1 Plug gage turn from notch
  • NPT L1 Ring gage turn from small end face of the ring

NPT thread gauges, is durable, resistant to wear and versatile. The three ring gages, are also used to check external threaded parts and is 100% calibrated and hardened steel. They conform to pre use class ANSI and X tolerances. There is also a pipe thread, which is 60 degrees and used for general purposes- which is called Temperature Probe- for pressure ratings. They are also intended to be sealed at the crest and root with Teflon tape.

The NPT thread gages, are incredible for measuring, and provide the information you need-to inspect the functional size of the pipes. When you order the product, make sure that you specify the short or long form certification, normal size and thread per inch measurements, and the quantity.