The JBO Thread Ring Gauge (GO) – Metric Coarse is a precision inspection tool designed to verify external thread sizes quickly and reliably. Built for engineers, machinists, quality control teams, and assembly buyers, it helps confirm that metric coarse threads match the M4 x 0.7 specification and will mate correctly with corresponding components. This GO gauge is specifically configured for left-hand threads (6e), ensuring accurate checks across the intended fasteners and fittings.

• Precise GO verification for metric coarse threads: Quickly confirms external threads like M4 x 0.7 meet the minimum size for proper mating, reducing ambiguity in pass/fail decisions and speeding up QC workflow.
• Rugged, hardened steel construction: Built to endure everyday use in busy inspection rooms, offering excellent wear resistance and long service life without compromising accuracy.
• Left-hand, 6e configured for reliable compatibility: Specifically engineered for left-hand metric coarse threads, ensuring consistent checks and preventing mismatches in left-handed fastener assemblies.

Using this gauge streamlines your quality process by delivering repeatable, quick checks that help prevent incorrect assemblies, lowering downtime and rework. Its durable build and precise sizing support tighter tolerances, improve part conformity, and give your team confidence that every threaded connection will function as designed in the field.