JBO Thread Ring Gauge (NoGo) - UNF - Left Hand - 2A - 5/8 x 18 ER Mini Collet Chucks 005 mm) for repeatable fits

005 mm) for repeatable fits and reduced rework across jobs

and less downtime from rework or adjustments—keeping your workflow steady from prototype runs to production

High-speed stability and rigidity: Designed for up to 25

Delivering precise 17

while the robust HSS‑E construction keeps its cutting edge longer in real-world machining

JBO Thread Ring Gauge (NoGo) - UNF - Left Hand - 2A - 5/8 x 18 ER Mini Collet Chucks 005 mm) for repeatable fitsThe JBO Thread Ring Gauge (NoGo) is a precision inspection tool designed to verify external UNF threads with speed and confidence. Specifically configured for left hand threads in the 5 8 x 18 size and class 2A, this gauge helps inspectors, machinists, and quality teams confirm proper fitment and quickly identify non conforming parts in automotive, aerospace, and general manufacturing environments. Crafted from hardened steel, this gauge stands up to