VCOIL Plug Gauge (NoGo) - Metric (STI) - Heli Coil Gauge - Right Hand - 4H - M39 x 3 Tiny Tool Inserts and help you consistently meet

and help you consistently meet threading standards across manufacturing

designed to streamline setups

with viewing angles shown in the accompanying image

simplifying setup and repeatability

helping you keep production moving and parts interoperable with confidence

VCOIL Plug Gauge (NoGo) - Metric (STI) - Heli Coil Gauge - Right Hand - 4H - M39 x 3 Tiny Tool Inserts and help you consistently meetVCOIL 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.