VCOIL Plug Gauge (NoGo) - Metric (STI) - Heli Coil Gauge - Right Hand - 4H - M39 x 3 Tiny Tool Inserts helping you keep production moving

helping you keep production moving and parts interoperable with confidence

simplifying setup and repeatability

this collet keeps the tool centered for consistent cuts and tight tolerances

13 mm diameter for precise guidance through the cut

and help you consistently meet threading standards across manufacturing

VCOIL Plug Gauge (NoGo) - Metric (STI) - Heli Coil Gauge - Right Hand - 4H - M39 x 3 Tiny Tool Inserts helping you keep production movingVCOIL Plug Gauge (NoGo) is a precision metric thread gauge designed for helicoil inserts, combining Go and No Go checks into a single, reliable tool. Its ideal for machinists and quality labs working with STI metric threads to verify correct engagement. Thread system: Metric (STI) with M39 x 3 right hand threads and 4H tolerance. Go No Go gauge: Integrated go end that threads in by hand and a no go end that must not thread in more than two turns.