JBO Thread Ring Gauge (GO) - Metric Coarse - Left Hand - 6g - M39 x 4 G controllable reaming in challenging materials

controllable reaming in challenging materials

this Type E4 collet chuck helps you streamline workflows

2 at the tip to preserve sharp internal corners and minimize chipping when working with tough materials

With its robust construction and precise tolerances

Built with HSS-E and the AcuRea coating

JBO Thread Ring Gauge (GO) - Metric Coarse - Left Hand - 6g - M39 x 4 G controllable reaming in challenging materialsThe JBO Thread Ring Gauge (GO) Metric Coarse Left Hand 6g M39 x 4 is a precision go gauge designed for quick, reliable validation of external metric coarse threads. Built for quality control teams, engineers, and workshop professionals, it helps confirm that threaded components will assemble correctly with M39 x 4 left hand connections. With a hardened steel construction and precisely milled GO features, this gauge delivers durable, repeatable