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Newer versions have no rubber nose seal for a simpler
The JBO Thread Ring Gauge (NoGo) – Metric Fine is a precision inspection tool for external thread diameters on metric threads
delivering stable measurements over time
reducing tool changes and keeping production on track
it offers smooth chip removal and stable hole sizing
JBO Thread Ring Gauge (NoGo) - UNC - Left Hand - 2A - 9/16 x 12 FLH Newer versions have no rubberThe JBO Thread Ring Gauge (NoGo) is a precision tool for verifying external UNC threads on fasteners, fittings, and machined components. This gauge is specifically sized for Left Hand UNC threads in the 9 16 x 12 family and is aligned with the 2A tolerance class to support reliable inspection in quality control workflows across manufacturing, automotive, and aerospace applications. Crafted from hardened steel, the gauge stands up to daily use on the
