Spi 34-480-4 Threaded Ring Gage M8x1 Metric 6G No Go

Product Description

The SPI 34-480-4 is a No Go threaded ring gage designed to verify external metric threads to M8 x 1.00 tolerance. Manufactured from Oil Hardened Non-Shrinking Steel (OHNS), it provides the dimensional stability and wear resistance required for repetitive production inspection. This single-ring gage is used to confirm that a threaded workpiece does not exceed the maximum material condition for Class 6G thread tolerance. Each unit ships with an NPL Traceability Certification, supporting quality systems that require documented measurement standards. Installation and use require no tools beyond proper gage handling technique — this is a hand-applied inspection instrument.

The 34-480-4 is suited for machine shops, manufacturing floors, and quality control departments inspecting M8 x 1.00 metric fasteners, threaded inserts, bolts, and similar externally threaded components to Class 6G specifications. It is used as the No Go member of a Go/No Go gage pair. A conforming part will not allow full engagement of this gage. Machinists, quality technicians, and tool-room professionals are the primary users of this instrument in both job-shop and production environments.

Key Features

• No Go ring gage confirms threads do not exceed Class 6G maximum material condition
• M8 x 1.00 metric thread form for standard metric fastener inspection
• Oil Hardened Non-Shrinking Steel (OHNS) construction for dimensional stability and long service life
• Single-ring design for straightforward No Go verification
• NPL Traceability Certification included for quality system compliance

Compatibility

Designed for inspection of externally threaded metric components with M8 x 1.00 thread form and Class 6G tolerance classification. Functions as the No Go member when paired with a matching Go ring gage of the same thread specification.

Installation Notes

Threaded ring gages are hand-applied inspection tools and require no mechanical installation. Store the gage in a clean, dry environment away from contaminants that could affect calibration. Handle with clean hands or lint-free gloves to prevent corrosion and dimensional contamination. Inspect the gage periodically for wear and recalibrate or recertify according to your facility quality management schedule.