Spi 34-466-3 Threaded Ring Gage M3x0.5 Metric Class 6G No Go

Product Description

The SPI 34-466-3 is a single-ring threaded ring gage used to verify external thread dimensions on M3 x 0.50 metric-threaded workpieces. This is the No Go member of the go/no go gage pair, designed to reject parts whose pitch diameter exceeds the high limit of tolerance for a Class 6G external thread. Manufactured from Oil Hardened Non-Shrinking Steel (OHNS), it provides stable dimensional characteristics under shop-floor temperature variation. NPL Traceability Certification is included, supporting quality-system documentation requirements. Machinists, quality technicians, and inspection personnel use this gage as part of in-process or final inspection routines.

This gage is suited for inspection of small-diameter metric fasteners, threaded inserts, and precision components with M3 x 0.50 external threads conforming to Class 6G tolerance standards. Class 6G is the most common tolerance class for general-purpose metric external threads, making this gage a standard tool in production inspection, incoming material inspection, and toolroom verification environments. It is sold as a single ring gage.

Key Features

• No Go member verifies that pitch diameter does not exceed the upper tolerance limit for Class 6G external threads
• M3 x 0.50 thread size covers standard small-diameter metric fasteners and components
• Oil Hardened Non-Shrinking Steel (OHNS) construction for dimensional stability and wear resistance
• NPL Traceability Certification included for quality management system compliance
• Single-ring design for straightforward handling during inspection operations

Compatibility

Designed for inspection of M3 x 0.50 metric external threads classified to Class 6G tolerance. Use with the corresponding Go ring gage to complete a full go/no go inspection pair.

Installation Notes

Threaded ring gages are used by quality technicians and machinists during thread inspection and do not require installation into a system. Before use, clean the gage and workpiece threads thoroughly to remove chips, coolant, and debris that could affect readings. Apply a light film of inspection oil to reduce wear on the gage. Store the gage in its protective case when not in use to prevent damage and maintain calibration integrity.