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ANPT or NPTF Reference Gage

Alpha Thread Gage, Inc.

Mailing address:

  PO Box 261
 

 Royal Oak, MI  

  48068-0261

E-MAIL: alphathread@aol.com

Leading the pack in the thread gage industry.

 

PHONE (248) 585-5800 FAX (248) 583-9800

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PIPE THREAD GAGES

   

FOR GAGING INTERNAL THREADS-ANPT or NPTF

internal
L1 Thread Plug, L3 Thread Plug
In gaging internal threads, either ANPT or NPTF, there are three gaging members involved:
  1. L-1 thread plug which checks the thread elements within hand pressure engagements.
  2. L-3 thread plug which checks the threads that will be engaged under wrench pressure.
  3. 6-Step plain plug which is used to check the minor diameter of the female fitting.

In gaging, the relation of the steps on the L-1 and L-3 plugs and the plain taper plug to the product should not vary by more than one-half turn.

   
FOR GAGING EXTERNAL THREADS-ANPT or NPTF
external  

   
n gaging external threads, either ANPT or NPTF, there are three more gages employed:
  1. 6-step plain ring which checks the major diameter of the male fitting.
  2. L-1 (thin) ring which checks the the thread elements over the distance of hand pressure engagement.
  3. L-2 (thick) ring which checks the the thread elements of those threads engaged under wrench pressure.

When inspecting external threads with these gages, the size indicated by each gage should not vary by more than one-half turn from that of either of the other gages.

   

ANPT and NPTF Gages are NOT interchangeable.

   
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