Spi 34-456-4 Threaded Ring Gage M1.6x0.35 Class 6G No Go

Product Description

The SPI 34-456-4 is a No Go threaded ring gage used to verify external thread quality on M1.6x0.35 metric fasteners and threaded components. Manufactured from Oil Hardened Non-Shrinking Steel (OHNS), this single-ring gage is designed to confirm that a threaded workpiece does not exceed the maximum material condition for Class 6G tolerance. If the gage passes over the thread, the part is out of tolerance and must be rejected. It is a standard inspection tool used by machinists, quality technicians, and tool-and-die professionals in production and receiving inspection environments.

This gage applies to metric M1.6x0.35 external threads held to Class 6G tolerances, which is the standard medium-fit tolerance class for general-purpose metric fasteners. Typical use cases include incoming inspection of purchased fasteners, in-process verification during CNC or screw machine operations, and final inspection before assembly. The included NPL Traceability Certification documents calibration traceability to national measurement standards, supporting ISO and AS9100 quality management system requirements.

Key Features

• No Go ring gage rejects threads that exceed maximum material condition for Class 6G tolerance
• M1.6x0.35 metric thread size for fine-pitch small-diameter inspection
• Oil Hardened Non-Shrinking Steel (OHNS) construction for dimensional stability and wear resistance
• Single-ring configuration for dedicated No Go function
• NPL Traceability Certification included for quality system compliance

Compatibility

Designed for inspection of M1.6x0.35 external metric threads to Class 6G tolerance. Use with a corresponding Go ring gage to complete a full pass-fail thread inspection routine per standard attribute gaging practice.

Installation Notes

Threaded ring gages are precision inspection tools and should be handled by qualified metrology or quality personnel. Store gages in a clean, dry environment away from chips, coolant, and abrasive contamination to protect the lapped thread form. Apply a light coat of clean instrument oil before and after use to prevent corrosion. Do not force the gage over a thread — if resistance is felt, the part may be within tolerance or the gage may require recalibration.