Gaging of NPT threads is quite easy and differs from straight threads in that only one gage, an L1 plug or L1 ring is used to determine acceptability.The taper pipe thread plug has a step at the L1 distance from its small end. When turned hand tight into the

an Engineer of Screw Thread Design and Manufacturing of gages and products. As an active ASME member, Mike is Chair-man of the ANSI committees B1.2 "Gages and Gaging For Unified Inch Screw Threads", and B1.16M "Gages And Gaging For Metric M Screw Threads", and an active member of the following committees: B1 main committee

10/9 · An in-depth tutorial on how to use a bolt gauge sizing tool. This tool will help you identify the Diameter, Thread Pitch, and Length , which are the 3 main d

Based on the pitch of the thread you are measuring, use the table below to select the proper set of thread measuring wires. 3. Adjust your micrometer to about 0.010" larger than you expect your measurement to be. 4. Put two wires in adjacent V's on the bottom of the part. Use the fixed anvil

3/8 · Method 1Determining U.S. Thread Pitch. 1. Measure an inch-long portion of the threaded area. Grab a ruler and lay it along the bolt or screw. Be sure to measure the threaded (or ridged) area only, starting from near the head. If your threaded area is less than an inch, measure out 1/2 an inch instead. [1]

The first thing you need to do is make sure that you are careful when applying pressure. There is no exact system for applying pressure to your thread plug gauge. However, when you apply a thread plug gauge, you should not have to apply force. It should easily fit into the threaded hole without you have to apply a lot of extra pressure.

A.N.P.T. internal taper pipe threads are basically the same as the N.P.T. pipe threads except that for Army and Navy Aeronautical use they must be more carefully controlled for diameter, taper and thread form. To gage . Internal A.N.P.T. taper pipe threads, check first with the A.N.P.T. L-1 thread plug gage. This plug differs in

Measuring a thread's effective pitch diameter is done using a thread micrometer, which is fitted with a vee and a conical anvil. · Thread gauges are not used for 

Utilizing Both Ends. Both the "go" and "no go" ends of your thread plug gage fulfill a vital role in verifying the strength and usability of a given component. Putting too much repetitive stress on one end of the gage, as mentioned above, can put you in a position where it quickly wears down. Even with proper storage, you may find yourself with

For right handed threads place the plug or ring at the entrance to the threaded part with light pressure and rotate the gage counterclockwise until you feel a small "click" as the lead thread on the part and lead thread on the gage just pass each other.

First, use a combination O.D./. I.D. caliper to measure the thread diameter. Note: The threads of a used fitting can become worn and distorted, so the measurements may not be exact. 2.) Second, use a thread pitch gauge to measure the number of threads the number per inch. For metric connections, measure the distance between threads.