VCOIL Plug Gauge (D/E) - Metric (STI) - Heli Coil Gauge - Right Hand - 4H - M30 x 2 S&E it delivers consistent bore sizes

it delivers consistent bore sizes with reliable performance

minimizing runout and chatter

Precisely dimensioned BSP (G) 3/8 x 19

Hardened steel construction for durability: Built to resist wear and keep measurements stable through frequent use in busy workshops

real-world reliability

VCOIL Plug Gauge (D/E) - Metric (STI) - Heli Coil Gauge - Right Hand - 4H - M30 x 2 S&E it delivers consistent bore sizesThe VCOIL Plug Gauge (D E) is a precision metric Helicoil thread gauge for righthand M30 x 2 applications. It delivers quick go nogo verification to 4H, aligned with ANSI ASME standards, helping shops verify thread quality in production and QA environments. Ends: D E dual ends with go and nogo functionality; scrap end marked with a red ring for easy identification. Thread system: Metric M30 x 2, righthand, 4H tolerance, suitable for Helicoil insert