The JBO Thread Ring Gauge (GO) – Metric Coarse, Right Hand, 4h, M1 x 0.25 – is a precision tool designed to quickly verify external metric coarse threads. It serves engineers, quality control professionals, machinists, and hobbyists who need dependable, repeatable checks to confirm parts meet the exact M1 x 0.25 standard and will properly mate with corresponding components.

Manufactured from hardened steel for outstanding wear resistance, this GO gauge delivers long service life in busy workshops. Its clean, simple design makes quick work of routine inspections, first-article checks, and vendor qualification, helping you keep production moving with confidence.

• Hardened steel construction: Built to withstand daily use in busy shops, delivering lasting durability and stable measurements over thousands of inspections.
• Accurate GO measurement for metric coarse threads: Quickly checks external threads against the M1 x 0.25 standard to ensure parts will thread in correctly and meet spec, reducing rework.
• Right-hand orientation with 4h tolerance: Designed to align with standard male threads and maintain reliable fit across materials and applications.

This GO thread ring gauge streamlines your QC workflow, delivering fast, repeatable checks that reduce rework and downtime. It helps ensure consistent thread engagement across parts, supports accurate documentation of conformance, and gives your team confidence in every assembly.