JBO Thread Ring Gauge (GO) - Metric Fine - Right Hand - 4h - M20 x 0.75 A&NF The uncoated surface minimizes friction

The uncoated surface minimizes friction

DIN 8089 compliance keeps it compatible with standard reaming procedures

CNC hobbyists

helping you achieve tighter tolerances and cleaner finishes on every job

durable cuts

JBO Thread Ring Gauge (GO) - Metric Fine - Right Hand - 4h - M20 x 0.75 A&NF The uncoated surface minimizes frictionThe JBO Thread Ring Gauge (GO) Metric Fine is a precision inspection tool designed to verify external thread diameters for metric fine threads. Built for machinists, quality engineers, and workshop technicians, this GO gauge enables quick, reliable pass fail checks that confirm M20 x 0. 75, right hand threads within the 4h tolerance. Accurate metric fine Go verification: Specifically checks M20 x 0. 75 right hand threads to the 4h tolerance,