JBO Thread Plug Gauge - UNC Go-No/Go - Left Hand - 2B - 1/4 x 20 Face Mill Arbors it uses a straight shank

it uses a straight shank that fits standard holders for straightforward setup and dependable performance in everyday workshop and production environments

Intermediate precision carbide (K10) with stub-length geometry: delivers robust wear resistance and rigidity in small-diameter through-holes

and a robust HSS core supports reliable

controlled chamfer

and shoulder cuts

JBO Thread Plug Gauge - UNC Go-No/Go - Left Hand - 2B - 1/4 x 20 Face Mill Arbors it uses a straight shankThe JBO Thread Plug Gauge is a precision left hand UNC go no go tool sized for 1 4 x 20 threads with a 2B tolerance class. It enables quick, reliable checks of threaded holes to ensure they meet the Unified Thread Standard. Designed for engineers, machinists, inspectors, and buyers, this gauge supports consistent quality across manufacturing, automotive, and aerospace applications by identifying conforming vs non conforming threads with a simple go no