The JBO Thread Plug Gauge is a precision tool for inspecting internal metric fine threads. This left-hand Go/No-Go gauge is calibrated for M24 x 0.75 holes, delivering quick, pass/fail results that ensure perfect thread mating every time.

Made from hardened steel, it resists wear in busy workshops and maintains tight tolerances for long life. Ideal for engineers, machinists, maintenance technicians, and quality inspectors who demand reliable thread verification before assembly.

• Go/No-Go quick checks for precise hole validation: The Go/No-Go design lets you quickly confirm whether the hole meets the M24 x 0.75 specification, speeding up setup and reducing rework.
• Left-hand metric fine-thread compatibility with ergonomic handling: Designed for left-hand M24 x 0.75 threads, with a knurled body and color-coded ends for secure grip and fast orientation in busy environments.
• Durable, precise construction (6H) for consistent results: Hardened steel machined to the 6H internal-thread tolerance, delivering reliable readings and long service life in demanding shop conditions.

With the JBO Thread Plug Gauge, you gain confidence that every hole matches the required metric fine thread standard, reducing guesswork and ensuring components assemble correctly the first time. The tool’s durable build and tight tolerances support repeatable inspections across shifts, helping you streamline quality control, minimize downtime, and maintain high manufacturing standards.