JBO Thread Plug Gauge - Metric Fine Go/No-Go - Left Hand - 6H - M14 x 1 Milling Cutter Arbors It’s compatible with standard ER20

It’s compatible with standard ER20 collet nuts

Built with advanced materials and precision manufacturing

reducing rework and improving fit reliability in assemblies

reliable go/no-go checks to confirm hole size meets specification

thanks to the combination of taper shank geometry and left-hand flute with right-hand cutting

JBO Thread Plug Gauge - Metric Fine Go/No-Go - Left Hand - 6H - M14 x 1 Milling Cutter Arbors It’s compatible with standard ER20The JBO Thread Plug Gauge is a precision inspection tool designed for metric fine threads. Built for engineers, machinists, and quality teams, it quickly checks whether a threaded hole will accept the mating part without guesswork. With a Go No Go design, you can confirm proper thread depth and tolerance in seconds, keeping assemblies tight and reliable. This model is specifically calibrated for left hand threads, with M14 x 1 pitch and 6H tolerance.