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Ensure the accuracy of internal NPT pipe thread measurements— these gauges come with a certificate of calibration traceable to NIST that states they’ve passed a test for accuracy. A notch on the handle indicates when the threads you’re checking are in tolerance. Gauges have a taperlock handle for quickly replacing worn gauges.


Below are a few simple explanations and general guidelines to the use of NPT (National Pipe Taper) thread gages. As always when in doubt refer to the ANSI/ASME referenced specifications like ASME B1.20.1 and B 1.20.5 & B1.20.3 which you can obtain through the ASME web site ...


NPT and NPTF Thread Gages. Pipe Thread Gages can be very confusing. Even experienced users who have used Straight Thread gages may be confused by the use of tapered pipe thread gages. Please see see the link below for a PDF to explain the basics of NPT and NPTF thread gages. NPT-NPTF-2019.pdf.


When the L1 plug is at minimum notch, the 6-Step Gage must go between the "MN" and "MNT" notches. Click here to view more information about our NPT Thread Gage. Click here to learn more about the basic use of NPTF 3-step & 6-step gages . Click here to view more information about our NPTF Thread Gage


Ring gauges can help make design engineering work more exacting and can confirm pipe thread accuracy. These ring gages are used in a wide variety of industries, including machine tool, automotive, oil and gas exploration, and other metal working endeavors. Rely on Grainger for precision measuring instruments.


3-8 Single End Tapered Plug Pipe Thread Gage Handle Size 6, NPT-L1 Tolerance. MSC# 55336812 GF Gage (P300008NSE) In Stock. Price: $394.87 . Add to Cart. Compare 1/2-14 Single End Tapered ...


Threaded Ring Gauges for NPT Pipe Threads. Measure NPT pipe threads. Threads per Inch and Thread Pitch Size Checkers. Inspect fasteners and verify threads with this checker. Ring Gauges for Outside Diameters. Use these gauges to check the outside diameter of shafts, rods, and other cylindrical objects to determine whether they’re in tolerance.


The NPT screw thread standard only defines a L1 ring gage for the male thread and a L1 plug gage for the female thread. Both gages measure the hand tight L1 length of the screw thread. There are no such NPT tapered pipe screw thread gages: L2; L3 or 6-Step Crest Check.


The requirements for NPTF (National Pipe Thread Fuel) are spelled out in ANSI B1.20.3 Both NPT and NPTF have the same threads-per-inch, pitch diameters, and taper-per-inch. The differences come in the major and minor diameters, the root and crest of the threads.


"Solid Carbide" Thread Plug Gages - INCH › Starting at $215.00 "TiN Coated" Thread Plug Gages - INCH › Starting at $47.00 Class X Tolerance (000040"/.001mm) Individual Plug Gages - (INCH & METRIC) › Starting at $13.45