VCOIL Plug Gauge (D/E) - Metric (STI) - Heli Coil Gauge - Right Hand - 4H - M8 x 1 NCDC Drill Chuck By choosing this internal insert

By choosing this internal insert

Balanced high-speed performance: Balance grade G2

it ships within 24/48 hours to support your workflow

Finish holes to ISO H4 with an exact 18

VCOIL Plug Gauge (D/E) - Metric (STI) - Heli Coil Gauge - Right Hand - 4H - M8 x 1 NCDC Drill Chuck By choosing this internal insertPrecision you can trust for metric internal threads. The VCOIL Plug Gauge (D E) is a go no go STI thread gauge designed for M8 x 1 applications, with a Right Hand orientation and 4H tolerance class to support Helicoil insert processes and quality control in precision parts. Thread standard: STI metric (ASME ANSI) with M8 x 1 threads and 4H internal tolerance for reliable conformance checks. Go No Go design: combined go end and no go end in one gauge;