JBO Thread Plug Gauge - Metric Fine Go/No-Go - Right Hand - 6H - M21 x 1.5 4 Month Widin The M2 HSS material provides

The M2 HSS material provides a robust balance of hardness and toughness for reliable tool life in typical workshop materials

enabling quick tool changes without swapping holders or reworking setups

repeatable slots with a quality finish

Straight shank in HSS-E (M35 cobalt): Rigid

JBO Thread Plug Gauge - Metric Fine Go/No-Go - Right Hand - 6H - M21 x 1.5 4 Month Widin The M2 HSS material providesThe JBO Thread Plug Gauge is a precision inspection tool designed for metric fine threads. Its ideal for machinists, quality inspectors, and assembly teams that require consistent hole sizes and accurate thread engagement. Built to streamline go no go checks, it helps you confirm fit quickly without guesswork. With a Go No Go design, you can perform fast pass fail assessments of threaded holes, speeding up setup and reducing inspection time. The