JBO Thread Plug Gauge - Metric Fine Go/No-Go - Left Hand - 6H - M39 x 2 Face Mill Arbors - Anti-Vibration consistent results in a range

consistent results in a range of materials

it features a left-hand spiral flute with right-hand cutting to deliver consistent bore sizes within ISO H5 tolerance

57 mm bore

Rigid Tapping for Precision: Delivers reliable

helps you speed up setups

JBO Thread Plug Gauge - Metric Fine Go/No-Go - Left Hand - 6H - M39 x 2 Face Mill Arbors - Anti-Vibration consistent results in a rangeThe JBO Thread Plug Gauge is a precision tool designed for metric fine threads. Its ideal for engineers, machinists, inspectors, and shop professionals who need quick, reliable verification of threaded holes. With its Go No Go design, you can confirm fitment in seconds, helping you move from setup to assembly with confidence. Specifically tuned for left hand M39 x 2 threads and 6H hole tolerances, this gauge makes it easy to verify whether a hole