JBO Thread Ring Gauge (NoGo) - UNJF - Left Hand - 2A - 1/4 x 28 FLH high-quality construction: Built to withstand

high-quality construction: Built to withstand frequent tool changes and demanding cutting environments

and predictable cycle times in your production workflow

Applications: Suitable for a wide range of milling tasks in metalworking and precision machining

repeatable results with stainless and exotic materials

resisting wear and maintaining accuracy through countless checks of fasteners

JBO Thread Ring Gauge (NoGo) - UNJF - Left Hand - 2A - 1/4 x 28 FLH high-quality construction: Built to withstandThe JBO Thread Ring Gauge NoGo is a precision tool for validating external UNJF threads. Sized for 1 4 x 28 left hand threads (2A class), it helps machinists, inspectors, and quality teams quickly confirm that parts meet exact diameter tolerances without guesswork. Constructed from hardened steel for lasting durability, this gauge withstands rigorous use in busy workshops, maintaining accurate measurements over time. Its straightforward design makes