JBO Plug Gauge - Metric Fine (STI) Heli Coil Gauge - Right Hand - 6H - M8 x 1 - Calibrated (DAkkS Calibration) Tiny Tool Inserts repeatable seating in compatible machines

repeatable seating in compatible machines to minimize runout and prevent tool slippage during reaming

Supplied by Toolex Ltd to BS 328/4 and finished to ISO H5 tolerance (-0 +0

With ISO H5 tolerance (similar to DIN 212 B) and a left-hand spiral flute paired with right-hand cutting

the tapered effective length adds rigidity where it matters most

square end for accurate slotting and profiling

JBO Plug Gauge - Metric Fine (STI) Heli Coil Gauge - Right Hand - 6H - M8 x 1 - Calibrated (DAkkS Calibration) Tiny Tool Inserts repeatable seating in compatible machinesThe JBO Plug Gauge Metric Fine (STI) is a precision measuring tool designed to verify metric Screw Thread Inserts (STIs) such as Heli Coil inserts. Built with a right hand orientation and sized for M8 x 1 threads, it carries a 6H tolerance and comes calibrated with DAkkS traceability. This gauge helps quality teams, machinists, and inspectors confirm that inserts meet ANSI ASME metric STI standards, delivering reliable fits and consistent performance