If you have equipment that uses thread gages, and you need to replace or work on a thread gage, it can be helpful to be familiar with the different terminology that surrounds thread gages. Here are four terms that you need to know when working with thread gages.
1. Master Plug/ Setting Plug
When working with thread ring gages, you have to frequently check the calibration of the gage. The calibration of the gage is checked using a tool that is referred to as both a master plug or a setting plug. This tools allows you to check the calibration of the gage in question, and make sure that the tolerance and calibration is correct for the gage.
2. Go and No-Go
When a gage is tested, its condition is usually described as either go or no-go. This is really as basic as it sounds. If the thread gage will work for the specific piece of equipment that it is being tested on, it will be marked as a go gage. If the thread gage will not work on that specific piece of equipment or is defective overall, it will be marked as a no-go part. These simple terms are used when talking about if a thread
3. Pitch Diameter
When you need to replace a thread gage, you need to know the pitch diameter. When you are working with a straight thread, the pitch diameter a measurement of the diameter of the cylinder. If you are measuring the pitch diameter on your own, it is measured from where the thread ridges to the thread grooves in a straight line.
On many thread gages, there is actually more than one pitch diameter. The first pitch diameter usually represents the maximum diameter of either the external or internal threads, and the second pitch diameter measurement matches the minimum diameter of the internal or external threads on the gage.
gage works for a specific machine and if it is in working condition altogether.
4. Class X & W Tolerance
Class X and W measure two different types of tolerance issues.
Class X is a measurement of the tolerance level for working gages. The Class X measurement needs to fit the necessary tolerance level for the machinery that the gage is being used on
Class W tolerance is a measurement that is used for setting plugs. This is a tolerance measure that lets you know if a setting plug gage will work for your machinery.
These are just a few of the terms you need to know if you are working with thread gages. Knowing the terminology surrounding gages will help you take care of, maintain, and replace your gages accurately and effectively. To learn more, contact a company like WESTport.