The JBO Thread Plug Gauge is a precision tool designed for metric coarse threads—specifically M12 x 1.75. This Right-Hand, Go/No-Go gauge uses a 4H tolerance to quickly verify threaded holes and ensure proper component fitment. Built from hardened steel for durability, it stands up to daily workshop use and provides consistent, repeatable results.

• Go/No-Go quick verification: Streamlined inspection that immediately confirms whether a hole meets the required M12 x 1.75 threads, reducing guesswork and rework on assemblies.
• M12 x 1.75 coarse thread compatibility: Precisely matched to common metric coarse threads, ensuring accurate checks and preventing mismatches in fasteners and components.
• Hardened steel for durability: Rugged construction resists wear from repeated insertions and everyday handling, delivering a long service life in busy shops.

This plug gauge helps engineers, machinists, maintenance professionals, and hobbyists validate hole quality quickly, keeping production moving and ensuring consistent results across parts. By providing dependable go/no-go feedback, it supports tighter quality control, faster assemblies, and fewer defects in threaded assemblies.