The JBO Thread Ring Gauge (NoGo) – Metric Fine, Left Hand, M17 x 1 is a precision inspection tool designed for quality teams, machinists, and assembly technicians who work with fine-pitch metric threads. This NoGo gauge helps verify external thread diameters to ensure components meet the M17 x 1 left-hand specification at a glance.

Manufactured from hardened steel for lasting wear resistance, this gauge stays accurate through daily use in demanding workshops. Its left-hand, metric-fine design supports fast, reliable identification of non-conforming parts, helping you maintain tight tolerances and consistent quality across production runs.

• Fast go/no-go verification for quick QC: Easily determine whether a part's external thread diameter falls within tolerance for M17 x 1 left-hand threads, speeding inspections and reducing guesswork on the shop floor.
• Hardened steel construction for durability: Built to withstand daily handling and contact with fasteners, resisting wear to maintain accuracy over time and across shifts.
• Specialized for left-hand M17 x 1, 6g: Precisely matched to the left-hand 6g thread geometry, ensuring reliable checks and clear pass/fail results for every component.

By using this gauge, you improve workflow precision, cut inspection time, and boost confidence in every measurement. It helps you identify mismatched parts before assembly or deployment, reduces rework, and supports consistent results across batches with a dependable, long-lasting tool you can trust in busy production environments.