NPT

prod_NPT_1 prod_NPT_2
Gauge dimensions are as per ASME B1.20.1.
Gauges are supplied as Basic Step & Min/Max Step.
GAUGING EXTERNAL THREADS GAUGING INTERNAL THREADS
prod_NPT_sket_1 prod_NPT_sket_2
The Basic Step gauge when screwed onto the threads of the component by hand, should be flush with the endof the component face within 1 turn, as shown above.
With Min / Max Step Ring Gauge With Min / Max Step Plug Gauge
prod_NPT_sket_3 prod_NPT_sket_4
When using a Min/Max Step type gauge, the end of the component face should be flush between the Minimum and Maximum steps.