The JBO Thread Ring Gauge (NoGo) - Metric Fine - Left Hand - 6g - M4 x 0.35 is a precision measuring tool designed to validate external thread diameters on fasteners and threaded components. It’s ideal for engineers, inspectors, machinists, and quality teams who need fast, reliable checks to confirm parts meet exact thread standards.

Manufactured from hardened steel, this NoGo gauge resists wear in demanding shop environments and maintains accuracy through repeated use. Its left-hand orientation and metric fine sizing deliver a clear, consistent indication of non-conforming threads, supporting efficient quality control and reliable assembly in production and maintenance workflows.

• Fast NoGo non-conformity checks: Quickly identify undersized or out-of-spec threads, reducing inspection time and minimizing rework.
• Precise metric fine sizing for M4 x 0.35: Specifically calibrated for fine-pitch 4 mm threads, delivering reliable verification and documentation of thread fit.
• Left-Hand orientation compatibility: Specifically designed for left-hand thread applications, ensuring you measure the correct feature and avoid cross-reading on the shop floor.

Using the JBO NoGo gauge streamlines quality control by providing objective, pass/fail verification for external threads. It helps shorten inspection cycles, reduces the risk of shipping out out-of-tolerance parts, and supports consistent assembly outcomes. With durable hardened steel construction and a design tailored to metric fine threads, it delivers lasting accuracy and dependable performance across busy shifts.