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  The 6h thread ring gauge is a tool used to measure threads. The 6h in its name represents the standard accuracy grade, that is, the 6h grade. A threaded ring gauge usually consists of two parts: a ring gauge with the inner diameter of the thread and a tapered gauge with the thread. To use, place the thread ring gauge inside the thread, rotate and slowly move the gauge until it contacts both the peak and valley of the thread, and then read the scale on the gauge to obtain parameters such as the diameter and pitch of the thread. 6h thread ring gauge is usually used in precision machinery manufacturing fields, such as aerospace, automotive and other industries.