The JBO Thread Plug Gauge is a precision tool designed for metric fine threads, ideal for engineers, machinists, quality teams, and hobbyists who need reliable hole-thread verification. Specifically calibrated for right-hand threads with M34 x 1 pitch and 4H tolerance, it helps ensure threaded holes accept fasteners exactly as intended before assembly.

Built for durability, the gauge features hardened steel construction and a knurled body that provides a secure grip and long-lasting performance in busy workspaces. The Go/No-Go design enables quick, consistent checks, reducing guesswork and protecting against misfits that can slow production or lead to rework.

• Go/No-Go Design for Fast Acceptance: Quickly confirm whether a threaded hole meets the required tolerance, speeding up inspections and preventing incorrect assemblies.
• Hardened Steel for Long Life: Withstands wear and repeated use in demanding environments, delivering reliable performance over time.
• Metric Fine Thread Calibration (M34 x 1, 4H, Right-Hand): Precisely matched to your specific thread standard, ensuring accurate checks and consistent results across parts.

This plug gauge helps streamline quality checks, reduce downtime, and support consistent, high-quality assemblies. By providing clear pass/fail feedback on hole threads, it enhances workflow efficiency for machinists, inspectors, and manufacturing teams alike.