The JBO Thread Ring Gauge (GO) for UNF left-hand threads is a focused inspection tool designed to verify external thread diameters with confidence. Sized No. 12 x 28 and built for 2A class left-hand UNF threads, it helps quality teams on the shop floor quickly determine if parts meet the required standards.

Crafted from hardened steel for lasting performance, this GO gauge delivers reliable measurements even in demanding environments. Its precise dimensions and user-friendly design make it easy to use across diverse applications, from production lines to inspection benches, helping you maintain consistent quality while preventing misfits and rework.

• Precise UNF GO Gauge for Left-Hand Threads: Specifically matched to No. 12 x 28 left-hand UNF threads in the 2A class, enabling fast pass/fail checks and straightforward conformity verification on the line.
• Durable Hardened Steel Construction: Built to withstand daily use, resist wear, and maintain accurate measurements over time in busy workshop environments.
• Clear, User-Friendly Inspection: Designed to highlight properly conforming components, speeding up QC workflows and reducing downtime from guesswork or rework.

Adopting the JBO GO Ring Gauge supports a streamlined inspection process, helping you confirm thread tolerances quickly, maintain consistent part quality, and improve overall production efficiency. Its robust construction and precise fit give you confidence that every checked part aligns with UNF left-hand specifications, enhancing reliability across assemblies and shipments.