how to use a thread gauge

Thread pitch gauges are used as a reference tool in determining the pitch of a thread that is on a screw or in a tapped hole. This tool is not used as a 

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.

The thread pitch is the distance between threads expressed in millimeters (measured along the length of the fastener). For example a thread pitch of 1.5 means 

Thread ring gauges should be laid flat to prevent them from rolling off a table. All gauging whenever possible should be done over an inspection table in the 

4/21 · 8. Connect Lead Screw to Pitch Diameter. Now, you will need to take the measurements for your thread gauge. First, you need to connect your lead screw to the pitch diameter. This process should be done by hand or using an electric drill or a lathe and lead screw combination. 9. Measure Gauge Size Multiple Times.

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.

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

A thread plug gage is used to check acceptance of a “nut” , (an internally threaded part). For small threaded parts, the gage will be double ended, with one end carrying the GO gage and the other end, the NOGO. For larger parts, the two may be separate pieces. A thread plug gage is designed to check the pitch diameter (to the given pitch

have a 60 degree angle. Acme and Worm threads have a 29 degree angle, and Whitworth threads have a 55 degree angle. 2. Pitch. This is the distance from a point on the screw thread to a corresponding point on the next thread measured parallel to the axis of the thread. It is represented by the letter p. 3. Depth of Thread.

Thread gages accomplish this in what is called a Go/No-Go measurement. To better understand this, let's look at a typical thread plug. A common thread plug assembly (more on this later) will contain a handle with two ends, one on either side. To inspect an internal thread, both ends of the thread plug are inserted into the threaded component.

Both classes of NPTF threads require the use of an L-2 gage for external threads or an L-3 gage for internal threads. The L-2 and L-3 gages check the Wrench