The thread ring gauge is a tool used to measure the accuracy of external thread dimensions. There are two types of thread angle options available for the gauge, which are 75 degrees and 60 degrees, depending on the couplers used at construction. Please make sure to specify the thread angle and pitch you need before purchasing. The thread ring gauge is used to inspect whether the external thread dimensions of the workpiece are qualified. Each specification of the thread ring gauge is divided into two types: Go gauge and No-go gauge, which can be purchased separately or together.

During the inspection process, only when the Go gauge can fully engage with the external thread of the workpiece, and the No-go gauge can only partially engage with the external thread and the engagement does not exceed two pitches, can the external thread be determined as qualified. Otherwise, it can be judged that the external thread dimensions are not qualified.

The thread ring gauge is used to inspect the quality of external threads, and it is only used to confirm whether the external threads can meet the usage requirements. For example, we use an M25*3.0 thread ring gauge to inspect whether the M25 thread with a pitch of 3.0 meets the process requirements (there are two specifications available, one is the Go gauge, and the other is the No-go gauge). Only when the Go gauge goes and the No-go gauge stops can it be proven that the thread processing is qualified.