JBO Plug Gauge - UNC (STI) Heli Coil Gauge - Right Hand - 2B - No. 4 x 40 - Calibrated (DAkkS Calibration) FMH FLH FHH S&E A&NF M&D Coating: New generation of PVD

Coating: New generation of PVD coating for high-performance cutting applications

it uses a left‑hand spiral flute with right‑hand cutting to provide stable reaming performance

5 mm thickness yields a sturdy kerf and helps reduce deflection

and supports higher feed rates for faster

and improve accuracy across demanding machining tasks

JBO Plug Gauge - UNC (STI) Heli Coil Gauge - Right Hand - 2B - No. 4 x 40 - Calibrated (DAkkS Calibration) FMH FLH FHH S&E A&NF M&D Coating: New generation of PVDThe JBO Plug Gauge for UNC (STI) is a precision inspection tool built to verify UNC screw thread inserts (STIs). Part of the Helicoil gauge family, its ideal for engineers, buyers, technicians, and inspectors who need fast, reliable checks on No. 4 x 40 inserts to ensure proper seating and performance in assemblies. Manufactured and assessed to ANSI ASME UNC standards, this plug gauge provides accurate pitch diameter checks for UNC STI inserts. It