The JBO Thread Ring Gauge (GO) - Metric Fine - Right Hand - 6g - M4 x 0.25 is a precision tool designed for inspecting external threads on fasteners, shafts, and mating parts. Built for engineers, machinists, and quality teams, it supports quick Go checks to confirm that a component’s thread diameter and pitch meet the M4 x 0.25 metric fine standard.

Made from hardened steel for durability and wear resistance, this GO gauge maintains accuracy through heavy use in busy workshops. Its right-hand thread specification ensures compatibility with common metric fasteners, making it a reliable companion for quality control, assembly, and routine maintenance checks.

• Precise metric fine GO verification: Quickly confirms external threads match the M4 x 0.25 standard, speeding up inspections and reducing guesswork during assembly.
• Hardened steel construction: Delivers long service life with excellent wear resistance, maintaining accurate measurements in demanding environments.
• Efficient go/no-go conformance checks: Intuitive geometry enables fast pass/fail decisions, supporting higher throughput and tighter quality control.

With the JBO Thread Ring Gauge, you gain a reliable, repeatable method to verify thread compliance, streamline QC workflows, and minimize rework. The compatibility with metric fine M4 x 0.25 threads and robust construction helps you maintain consistent threading across parts, improve interchangeability, and protect downstream performance in assemblies and maintenance tasks.