What is the purpose of thread ring gages?

Thread ring gages are specifically designed to verify the fit of threaded holes and fasteners. They ensure that the threads will properly mate with corresponding threaded parts, providing assurance that the fit is within acceptable tolerances. These gages help determine if the threads are correctly formed according to specified dimensions and profiles, which is vital for ensuring that the hardware functions correctly in its application.

The other options are outside the intended function of thread ring gages. Measuring the diameter of holes pertains to different types of gages or measurement tools, while creating internal threads involves machining processes and tools such as taps rather than gages. Measuring taper angles also requires specialized instruments designed for that purpose, which are not related to the verification of thread fit. Thus, the primary role of thread ring gages is focused clearly on ensuring the compatibility and accuracy of threaded components.