JBO Thread Plug Gauge - Metric Fine Go/No-Go - Right Hand - 6H - M21 x 1 FHH supporting a stable cut and

supporting a stable cut and consistent results across jobs

18 mm diameter (as listed in the product title)

with a straightforward cylindrical straight shank for easy mounting into standard tool holders and machines

The taper shank partners with DIN 8051 B interfaces to fit standard toolholding systems for stable

while the combination of left-hand spiral flute and right-hand cutting facilitates efficient chip evacuation and a smoother bore finish

JBO Thread Plug Gauge - Metric Fine Go/No-Go - Right Hand - 6H - M21 x 1 FHH supporting a stable cut andThe JBO Thread Plug Gauge is a precision Go No Go gauge crafted for metric fine threads, designed to verify threaded holes quickly and confidently. Built for right hand threads and rated to 6H, it ensures that M21 x 1 holes accept the correct mating parts every time, making it ideal for machining shops, assembly lines, and maintenance teams alike. Made from hardened steel for lasting performance, this gauge stands up to daily use in demanding