Asimeto Ring Thread Gauge (NoGo) - Metric - Right Hand - 6g - M42 x 1The Asimeto Ring Thread Gauge (NoGo) from the 686 Series is a precision tool for machinists, inspectors, and assembly professionals who need reliable metric thread verification. Designed for M42 x 1 right hand threads with a 6g tolerance, it provides a clear NoGo pass fail check to confirm the pitch diameter stays within spec. Designation: NoGo gauge for quick identification of oversized or out of tolerance threads. Thread size: Metric M42 x 1, right