JBO Thread Plug Gauge (GO) - Metric Fine - Right Hand - 6H - M78 x 1.5 S&E 47mm is a through-coolant carbide

47mm is a through-coolant carbide reamer designed to finish predrilled holes to precise ISO H4 size

controlled reaming in typical setups

and maintain repeatable results across parts—helping you speed up workflows

Precision engagement with keyless chucks: The specially shaped blade securely graps the knurled sleeve or collar

3 mm for controlled corner relief: The precise radius supports accurate corner work on molds and dies

JBO Thread Plug Gauge (GO) - Metric Fine - Right Hand - 6H - M78 x 1.5 S&E 47mm is a through-coolant carbideThe JBO Thread Plug Gauge (GO) in Metric Fine is a precision inspection tool for internal threads in threaded holes. Its designed for engineers, machinists, quality teams, and maintenance professionals who need fast, reliable confirmation that holes conform to the M78 x 1. 5 fine pitch standard with 6H tolerance. Crafted from hardened steel, this gauge resists wear and maintains accuracy through heavy use in busy workshops. Its simple, intuitive