JBO Thread Plug Gauge (NoGo) - Metric Fine - Left Hand - 6H - M50 x 1.5 S&E concentric grip that helps keep

concentric grip that helps keep tool alignment consistent through each pass

and dependable results across a range of demanding applications

consistent radii in corners and smooth transitions on sloped profiles

and is built for through-coolant applications to maintain stability during deep hole reaming

rigid form factor for dependable performance in shallow and deep bores alike

JBO Thread Plug Gauge (NoGo) - Metric Fine - Left Hand - 6H - M50 x 1.5 S&E concentric grip that helps keepThe JBO Thread Plug Gauge (NoGo) Metric Fine, Left Hand, 6H, M50 x 1. 5 is a precision tool designed to verify internal threads with metric fine pitch on lefthand holes. Its built for engineers, machinists, inspectors, and workshop staff who need quick, confident checks to confirm threaded holes meet exact standards. Left Hand Metric Fine Thread Compatibility: Specifically designed for M50 x 1. 5 lefthand holes, ensuring accurate, unambiguous go no go