The JBO Thread Ring Gauge (GO) is a precision tool designed to verify external thread diameters to metric fine standards. It’s ideal for machine shops, manufacturing QC teams, engineers, and tradespeople who need quick, reliable go/no-go checks on threaded parts. Built from hardened steel, this gauge provides durable, wear‑resistant performance on busy work floors and features a left-hand, metric fine thread specification (M42 x 1.5) with a 6g tolerance to deliver consistent results.

• Precise GO Gauge for External Threads: Delivers accurate measurements of external thread diameters to metric fine standards, enabling quick go/no-go decisions for parts with M42 x 1.5 left-hand threads (6g tolerance).
• Durable Hardened Steel Construction: Built to withstand daily shop-floor use, resisting wear and retaining precise dimensions over many inspections, reducing replacement costs and downtime.
• Easy Go/No-Go Inspection: Simple, intuitive checks let operators quickly identify conforming parts, speeding QC workflows and helping ensure consistent quality across batches.

Incorporating this gauge into your inspection routine accelerates throughput, minimizes rework, and enhances overall part consistency. Its robust build and precise metric fine, left-hand M42 x 1.5 specification provide reliable, repeatable results that you can depend on across demanding manufacturing environments.