Thread Ring Gauge Usage

In this setup the manufacturer uses a master ring gage.

Thread ring gauge usage.

The inverse is true of rings. The thread profile has a truncated crest. Using thread gages is really pretty simple if the go thread plug goes in to the threaded hole and the nogo does not then the product is usually considered within the tolerance limits and acceptable. The not go element tests only that the effective diameter is not too large minimum material limit.

The no go thread ring gage has a thread length of at least three threads. Which end of the npt nptf anpt thread ring is up. The external thread major and minor diameters are not tested here. Spinning thread ring gages or thread plug gages onto or into parts will create greater friction and increased wear thus reducing the life of the gage.

The go and no go thread ring gage is the simplest and most economical method of inspecting external screw threads thread ring gages are very easy to use. A master ring is a gage that has been manufactured with a bilateral tolerance. In doing so it checks the largest dimension of the external thread pitch diameter including certain form deviations in the thread e g. It is not a setting plug master plug or master ring those are used to check the np style work plugs rings to make sure they are in compliance.

Go thread ring gages. I hate to admit it but this does come up occasionally. The go and no go rings are normally separate pieces. For testing external product threads go and not go ring gauges or caliper gauges having go and not go anvils may be used.

The go thread ring gage checks the so called mating size of the external thread and screwing on capability. The minor diameter of the internal thread can be checked separately using a double ended plain plug gauge. Pitch and thread profile angle deviations. The no go thread ring gage must not be able to be screwed onto the workpiece.

Work plug or work ring is exactly that a thread gage used to check your products. Using hard chrome plated thread gages can extend the wear life by more than 100 over standard tool steel gages which can provide dramatic savings on replacement costs. A thread ring gauge is designed to check the correctness of the thread to include thread depth and pitch diameter to the given pitch tpi. A solid thread ring gauge is used to check acceptance of a screw i e.