Spi 34-504-1 Threaded Ring Gage M20x1.5 Metric Class 6G No Go

Product Description

The SPI 34-504-1 is a single-ring threaded ring gage designed to perform No Go functional checks on M20 x 1.50 metric external threads. Manufactured from Oil Hardened Non-Shrinking Steel (OHNS), this gage provides the dimensional stability and wear resistance required for accurate, repeatable gauging in production and inspection environments. Classified to tolerance Class 6G, it is used to verify that a threaded workpiece does not exceed its maximum material condition, confirming the thread falls within specification. A National Physical Laboratory (NPL) Traceability Certification is included with each unit, supporting quality management and audit requirements.

This gage is suited for use in machine shops, manufacturing facilities, and metrology labs where metric fastener threads must be inspected to international standards. The M20 x 1.50 size is common in automotive, heavy equipment, and precision mechanical assemblies. Inspectors and quality technicians use this No Go ring gage as part of a Go/No Go pair to establish complete thread acceptance criteria per Class 6G tolerances. It is appropriate for incoming inspection, in-process verification, and final inspection stages.

Key Features

• No Go ring gage confirms threads do not exceed maximum material condition for Class 6G tolerance
• M20 x 1.50 metric thread size for wide use in automotive and mechanical assembly inspection
• Oil Hardened Non-Shrinking Steel (OHNS) construction resists wear and maintains dimensional stability
• NPL Traceability Certification included to support ISO and quality system documentation
• Single-ring design for straightforward handling and storage in inspection toolkits

Compatibility

Designed for functional inspection of external metric threads with M20 x 1.50 pitch and Class 6G tolerance classification. Intended for use as a No Go member in a standard Go/No Go thread gage set.

Installation Notes

Thread ring gages are used by quality technicians and machinists and do not require power or mechanical installation. Before use, clean the gage and workpiece threads of chips, oil, and debris to ensure accurate results. Do not force the No Go gage onto a threaded part; if it does not engage freely, this is the expected passing result. Store the gage in its protective case away from impact and temperature extremes to preserve calibration integrity.