The JBO Thread Plug Gauge is a precision Go/No-Go tool designed for metric fine threads. It’s the ideal inspection companion for machinists, quality inspectors, and assembly teams who need fast, reliable verification of threaded holes before mating parts. Specifically tuned for fine-pitch threads, it lets you confirm whether a hole will accept or reject fasteners with confidence.

This gauge is built for left-handed applications with an M34 x 1 thread specification and 6H tolerance. Crafted from hardened steel, it delivers durability and long-lasting accuracy in busy workshops, even with daily use and routine rechecks.

• Dual-end Go/No-Go design: The go end confirms the hole will accept a properly sized thread, while the no-go end ensures it does not exceed the tolerance. Quick pass/fail checks save inspection time and prevent misfits.
• Metric fine thread compatibility: M34 x 1 (left-hand): Precisely matched to left-handed metric fine threads to ensure accurate acceptance testing and consistent fit when assembling components that use this pitch.
• Hardened steel construction with knurled grip: Built for durability and repeated use; the knurled body provides a secure, comfortable hold for accurate, torque-free checks in any work environment.

With this plug gauge in your toolkit, you’ll achieve faster, more dependable thread inspections, reduce rework, and improve overall assembly quality. Its robust construction and precise metric fine thread alignment give you confidence that every threaded hole meets spec, boosting uptime and workflow efficiency in production, maintenance, and engineering roles.