JBO Thread Plug Gauge - Metric Fine Go/No-Go - Left Hand - 6H - M12 x 0.5 Face Mill Arbors Built from premium materials and

Built from premium materials and finished with a durable W coating

repeatable hole finishing in professional workshops

Ideal for machinists and fabricators seeking repeatable

enabling accurate reproduction of complex curves and improved surface finish

helping screws sit flush with the surface

JBO Thread Plug Gauge - Metric Fine Go/No-Go - Left Hand - 6H - M12 x 0.5 Face Mill Arbors Built from premium materials andThe JBO Thread Plug Gauge is a left hand, metric fine thread Go No Go gauge designed for precise inspection of threaded holesspecifically M12 x 0. 5 with 6H tolerance. It helps engineering teams, machine shops, and maintenance crews quickly confirm that holes will accept mating parts without guesswork, boosting first pass quality in every run. Go No Go quick checks: A simple pass fail test for threaded holes lets you verify acceptance in seconds,