VCOIL Plug Gauge (D/E) - Metric (STI) - Heli Coil Gauge - Right Hand - 4H - M8 x 1

Precision 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; scrap side clearly marked with a red ring for quick assessment.
• Go end usability: should screw into the thread cut in a part by hand without requiring excessive force, confirming proper fit.
• No-Go end limit: the scrap end must not be turned more than two turns into the cut thread, ensuring the thread does not meet the standard.
• Right-hand orientation: optimized for common external-to-internal thread inspection workflows using standard right-handed threads.
• Size designation: D/E gauge family within the Helicoil gauge lineup, suited for M8 x 1 insert verification.
• Construction: knurled body and durable finish provide a secure grip and repeatable measurements in workshop environments.
• Reference standard: manufactured and assessed in accordance with ANSI/ASME thread system requirements for consistent quality control.
• Temperature reference: measurements are referenced at 20°C for parts and gauges to ensure measurement stability.

This plug gauge supports precise verification of internal threads before Helicoil insert installation, helping you detect mismatches early, reduce rework, and maintain consistent assembly quality. Its clear go/no-go design and tactile knurled grip make it a practical addition to any precision machining or inspection toolkit.