Spi 34-488-7 Threaded Ring Gage M12 X 1.25 Class 6G No Go

Product Description

The SPI 34-488-7 is a single-ring No Go threaded ring gage designed for checking external metric threads to the M12 x 1.25 specification at a Class 6G tolerance. Made from Oil Hardened Non-Shrinking Steel (OHNS), this gage provides the dimensional stability and wear resistance required for repetitive thread inspection work. It is used to verify that a threaded part does not fall within the No Go tolerance zone, ensuring that external threads meet the upper limit of the specified tolerance class. Machinist-grade precision makes it suitable for quality control departments, tool rooms, and production floor inspection stations.

This gage is intended for metric thread inspection applications where Class 6G tolerance verification is required. It applies to M12 x 1.25 externally threaded fasteners, fittings, and machined components. The single-ring design handles the No Go function only, making it a direct complement to a corresponding Go ring gage when a complete pass/fail inspection routine is required. Typical users include QC technicians, machinists, and manufacturing engineers working with metric fastener specifications.

Key Features

• No Go function for M12 x 1.25 metric external thread inspection
• Class 6G tolerance classification for standard metric thread fits
• Oil Hardened Non-Shrinking Steel (OHNS) construction for dimensional stability and long service life
• Single-ring design dedicated to the No Go function
• NPL Traceability Certification included for calibration documentation and quality system compliance

Compatibility

Designed for inspection of externally threaded metric components with an M12 x 1.25 thread form at a Class 6G tolerance classification.

Installation Notes

Threaded ring gages are used by QC technicians and machinists and require no installation. Handle with clean, dry hands or inspection gloves to prevent corrosion from contact oils. Store in a protective case away from temperature extremes and contaminants that could affect calibration. Verify gage certification records are current before use in a documented quality inspection process.