Spi 34-464-8 Threaded Ring Gage M2.5 X 0.45 Class 6G No Go

Product Description

The SPI 34-464-8 is a single-ring, No Go threaded ring gage designed to inspect M2.5 x 0.45 metric external threads to Class 6G tolerance. Machined from oil hardened non-shrinking steel (OHNS), this gage provides the dimensional stability and wear resistance required for accurate, repeatable thread inspection on the shop floor or in a quality lab. NPL traceability certification is included, supporting ISO and internal quality system requirements. It weighs 1 pound and ships as a single unit. Metrology technicians, machinists, and quality inspectors use this gage as part of a go/no-go inspection routine to verify that threaded fasteners and components fall within the upper boundary of Class 6G tolerance.

This gage is suited for inspecting small-diameter metric threaded parts in manufacturing, aerospace, automotive, and general precision machining environments. The M2.5 x 0.45 thread size is common in miniature fastener and instrument applications. Used as the No Go member of a two-gage set, it confirms that threads do not exceed the maximum material condition limit. It is sold and used as a single ring gage and is typically paired with a corresponding Go ring gage to complete the full Class 6G inspection process.

Key Features

• No Go member for M2.5 x 0.45 metric thread inspection to Class 6G tolerance
• Single-ring design for straightforward go/no-go gauging workflow
• Constructed from oil hardened non-shrinking steel (OHNS) for dimensional stability and long service life
• NPL traceability certification included, supporting documented quality systems
• Compact and lightweight at 1 pound, suited for bench or in-process inspection use

Compatibility

Designed for inspection of external M2.5 x 0.45 metric threads manufactured to Class 6G tolerance specifications. Intended for use as the No Go member alongside a matching Go ring gage in a complete thread inspection set.

Installation Notes

Thread ring gages are inspection tools and do not require installation in the traditional sense. Handle with clean, dry hands or lint-free gloves to prevent corrosion and dimensional error from contamination. Store in a protective case away from other metal tooling to prevent nicking the lapped bore. Calibrate and re-certify at intervals consistent with your quality management plan and applicable metrology standards.