A ring gauge is a cylindrical ring-shaped tool used to measure the external diameter of cylindrical objects like pins, shafts, and fasteners. It's made of a thermally stable material like steel or chrome plated tool steel and has a precisely machined inner diameter.
A thread gauge is used to check the dimensions of a specific thread form angle, pitch and diameter. Plug gauges are used to check internal threads, whereas ring gauges are used to check external threads.
Plain plug gauges are used to check dimensional tolerances in bore holes drilled with smooth walls. There is also thread plug gauges which are used to check threaded holes, and verify the correct thread type, main diameter, minor diameter, pitch diameter, and thread pitch against a mating thread gauge
A thread ring gauge is a tool used to measure the outside diameter of threaded parts, such as screws and bolts, to ensure they meet tolerances. It can also check the pitch diameter limits and thread form angle of a specific thread. Thread ring gauges are typically cylindrical and made from a stable material with a precise bore in the center that acts as a gauge for the outer diameter of the part. They are more accurate and reliable than leaf-style gauges.
