NPT thread ring gaugeNPT thread plug gauge

NPT thread gages manufacturer / supplier

NPT thread plug gauges & ring gauges

Ring gages used to check external thread, plug gages used to check internal thread.

NPT thread gauges, the full name is National Pipe Thread Taper thread gauges

Thread angle 60, Taper: 1:16, tooth shape is flat

We have below sizes in stock

1/8″-27 NPT 1/4″-18 NPT 3/8″-18 NPT 1/2″-14 NPT
3/4″-14 NPT 1″-11.5 NPT 1 1/4″-11.5 NPT 1 1/2″-11.5 NPT
2″-11.5 NPT 2 1/2″-8 NPT 3″-8 NPT 3 1/2″-8 NPT
4″-8 NPT 5″-8 NPT 6″-8 NPT

All our gauges can be sent to third party calibration institution to get calibration certificates.


NPT threadNPT thread

H=0.866 025 P ;  h=0.8 P;  f=0.033 P ; P=25.4/n

NPT thread gages standard: ANSI/ASME B1.20.1

We know the reliable accuracy is essential,By continuously improving the effectiveness of our process and providing on time

100%-okey products to customers, we will strive to ensure customer satisfaction.

“customer satisfaction” is our pursuit forever.

Main shipping way: by Express (DHL and UPS)

Accepted payment way: T/T , Paypal or West Union

Welcome new and old clients come to talk business with us!