Thread ring gauge is used to measure the accuracy of the outer thread size, through the end of one, only the end of a specification into coarse teeth, fine teeth  in Thread ring gauge, pipe thread three. After the threaded ring after use, should be promptly cleaned measurement site attachments, stored in a predetermined measuring box. By measuring the production site in the process of set should be placed in the position, gently, to prevent damage to the measuring surface bump. Measuring strictly prohibited as a cutting tool forcibly screwed into threads, to avoid premature wear. When using pass rules: It should be noted and the deviation measured thread tolerance class code identification ring gauge tolerance level, the same error code (such as M24 × 1.5-6h and M24 × 1.5-5g two identical ring shape, the thread tolerance not the same, wrong generation after batch defective test measurement process: first to clean up thread measured oil and impurities, and then thread ring gauge and tested positive after using the thumb and index finger rotating ring, it is screwed in the free state is determined by the length of the thread of all qualified, otherwise unreasonable determination only regulation Use: It should be noted and the deviation measured thread tolerance class code identification ring gauge tolerance level,