JBO Thread Plug Gauge - Metric Fine Go/No-Go - Right Hand - 6H - M12 x 1 Boring Bar Blank This intermediate precision HSS (M2)

This intermediate precision HSS (M2) straight shank reamer is sized at 18

and pre-hardened workpieces

Left-hand flute with straight shank: Stable cutting action and easy mounting in standard machine tool holders

Its carbide composition and defined flute geometry provide durable performance

Coolant-sealed design with non-overlapping slots: The longitudinal slots do not overlap at the centre

JBO Thread Plug Gauge - Metric Fine Go/No-Go - Right Hand - 6H - M12 x 1 Boring Bar Blank This intermediate precision HSS (M2)The JBO Thread Plug Gauge is a precision Go No Go inspection tool designed for metric fine threads. Specifically engineered for M12 x 1 right hand threads with 6H tolerance, it helps ensure threaded holes meet exact specifications during manufacturing, assembly, and quality control. Crafted from hardened steel and finished with a knurled, non slip body, this gauge delivers durable, long lasting performance in busy workshops while providing consistent