JBO Thread Ring Gauge (NoGo) - UNF - Right Hand - 3A - 9/16 x 18 FLH 71 mm is a precision

71 mm is a precision bore enlarging and finishing tool designed for machinists and hobbyists who need consistent hole sizing

Extended neck for enhanced reach: Access deep features and undercuts without sacrificing rigidity

5 is a precision tool designed to verify external thread diameters with reliability

This reamer is built for engineers who require precise 18

traceability

JBO Thread Ring Gauge (NoGo) - UNF - Right Hand - 3A - 9/16 x 18 FLH 71 mm is a precisionThe JBO Thread Ring Gauge (NoGo) is a precision inspection tool designed to verify external UNF threads with confidence. Sized for a 9 16 18 UNF, right hand thread and class 3A, it helps quality teams quickly confirm whether a threaded part meets the Unified Thread Standard. The NoGo profile provides an immediate, visual indication of non conforming threads, making pass fail decisions fast and reliable on the shop floor. NoGo design for rapid,