JBO Thread Plug Gauge (NoGo) - Metric Fine - Left Hand - 6H - M42 x 3 NCDC Drill Chuck and hobbyists who need reliable

and hobbyists who need reliable hole quality and smooth finishes in a single operation

delivering consistent bore quality even in challenging materials

Built on an HSS‑E base with M35 cobalt content and finished with the AcuRea coating

A straight shank simplifies tool mounting

and maintaining consistent quality from prototype through production runs

JBO Thread Plug Gauge (NoGo) - Metric Fine - Left Hand - 6H - M42 x 3 NCDC Drill Chuck and hobbyists who need reliableThe JBO Thread Plug Gauge (NoGo) Metric Fine LH, 6H, M42 x 3 is a precision NoGo plug gauge tailored for metric fine threads. This left hand (LH) version is designed to check internal threads in LH hole applications, with a nominal M42 x 3 size and 6H internal tolerance to ensure reliable, repeatable inspections. Metric Fine Thread Precision (M42 x 3, 6H): Specifically engineered for metric fine threads, enabling fast, accurate NoGo checks of hole