1/2-14 NPT thread gage- 1/2″ NPT ring plug gauge

1/2” NPT plug gage1/2-14 NPT ring gage

1/2-14 NPT thread ring gage

1/2″-14 NPT thread plug gage

  • DEC. : 0.5
  • Frac.: 1/2″
  • TPI: 14

In stock, can be sent out the next day.

Each 1/2 NPT thread gage 100% calibrated with quality assurance.

RH= right hand  LH=left hand both available

if clients need 1/2″-14 NPT right hand thread gauge, then no need special notes.

if clients need 1/2″-14 NPT left hand thread gage, then need special notes.                                

For example: 1/2-14 NPT-LH thread ring gage 1 pc

NPT thread’s basic size

Diameter : 1/2  n=14  P=1.814  h=1.451 Major Dia.= 21.223  Pitch Dia.=19.772  Minor Dia.=18.321

The above data come from ASME B1.20.2M

1/2″ NPT thread gauge calibration certificate

If needed, one long form calibration certificate from professional third party testing lab accredited to ISO/IEC 17025 can be supplied. gaugesools also can provide UKAS certificates and NIST certificates if needed.These calibration certificates need extra cost, if clients need them,please tell in advance.

About us

gaugestools is a professional manufacturer and supplier of thread ring gages and thread plug gauges,including GO/NOGO, RH/LH(right hand and left hand).We have rich ranges of thread gauges, including UN, Metric, ACME, stub-ACME,BSPP, BSPT, NPT, NPTF, Trapezoidal, and Whitworth etc.

The 1/2 NPT thread gauge produced according to ANSI/ASME B1.20.1

Worldwide shipment , usually taking 3-4 days clients can receive goods.

How to use 1/2″ NPT ring plug gage

  • NPT plug gage: it control workpiece’ s internal thread’s pitch diameter within L1 range. when screw in the plug gage into the internal   NPT thread,  internal thread’s large end should be in one pitch range with the plug gage’s step (Gaging Notch). otherwise, the workpiece’s internal thread is unqualified.
  • NPT ring gage: it control workpiece’ s external thread’s pitch diameter within L1 range. when screw in the ring gage into the external NPT thread, external thread’s small end should be in one pitch range with the ring gauge’s small end. otherwise, the workpiece’s external thread is unqualified.

The pictures are just for reference. As too many items in stock, we haven’t taken pictures one by one, If clients need  actual goods’s pictures, we are happy to take.

Check the full range of NPT thread gage in stock

Size TPI P Major Diameter Pitch Diameter Minor Diameter
Small end Gaging Notch Large end Small end Gaging Notch Large end Small end Gaging Notch
1/2 14 0.07143 0.80600 0.82600 0.83936 0.75843 0.77843 0.79179 0.71086 0.73086


We accept payment of T/T(bank transfer), Paypal, Credit Card, and West Union etc.


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1/2"-14 NPT thread ring gage1/2-14 NPT thread plug gage