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Designed to deliver precise hole finishing with a consistent bore diameter
and supports higher feed rates for faster
it uses a left‑hand spiral flute with right‑hand cutting to provide stable reaming performance
Uncoated and built to ISO 529 dimensions
5 mm thickness yields a sturdy kerf and helps reduce deflection
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 Designed to deliver precise holeThe 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
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