JBO Thread Plug Gauge (GO) - Metric Fine - Right Hand - 6H - M55 x 4 NCDC Drill Chuck Built for machinists who demand

Built for machinists who demand tight tolerances

helping you minimize rework and speed up production

Built for a wide range of users—from engineers and shop floor technicians to hobbyists—the straight shank and robust HSS-E (M35 Cob) construction deliver reliable bore quality in demanding materials

accurate bore finishing in a range of materials

or shape and re-bored multiple times for larger parts—reducing the need for multiple unique collets

JBO Thread Plug Gauge (GO) - Metric Fine - Right Hand - 6H - M55 x 4 NCDC Drill Chuck Built for machinists who demandThe JBO Thread Plug Gauge (GO) in metric fine is a precision inspection tool designed to quickly verify internal threads in drilled or tapped holes. It is ideal for engineers, machinists, quality inspectors, and maintenance teams who need a reliable go no go check to confirm a hole meets the exact size and tolerance for M55 x 4 threads with a 6H fit. Crafted from hardened steel for long wear, this GO gauge features a knurled, easy grip body and a