The JBO Thread Plug Gauge is a precision inspection tool designed for metric fine threads. With a Go/No-Go design on a compact dual-ended gauge, it lets you quickly verify threaded holes and confirm proper thread engagement, helping ensure parts assemble smoothly and reliably.

Built for professionals and serious hobbyists alike, this Right-Hand (RH) thread gauge for M25 x 1 with a 4H tolerance delivers dependable performance where precision matters—from machinery maintenance to component fabrication. The rugged construction provides consistent results across repeated use.

• Go/No-Go quick checks: Enables fast pass/fail assessment of internal threads, reducing inspection time and minimizing rework by clearly indicating acceptable and out-of-tolerance holes.
• Metric fine thread, M25 x 1 RH, 4H tolerance: Precisely sized to verify correct hole depth and thread fit with standard components, helping prevent cross-threading and installation issues.
• Hardened steel construction: Withstands daily shop use and wear, maintaining accuracy over time for long-lasting, reliable performance.

Using the JBO Thread Plug Gauge shortens setup and inspection routines, improves quality control across assemblies, and supports consistent results in maintenance and production workflows. Its durable design and clear go/no-go criteria give you confidence to move projects forward with precision.