Spi 34-489-5 Threaded Ring Gage M12x1.75 Class 6G Go

Product Description

The SPI 34-489-5 is a single-ring threaded ring gage used to verify the external thread dimensions of M12 x 1.75 metric fasteners and threaded components. Classified as a Go gage to Class 6G tolerance, it confirms that a machined or formed thread falls within the acceptable minimum material condition for proper mating assembly. Manufactured from Oil Hardened Non-Shrinking Steel (OHNS), the gage maintains dimensional stability under shop conditions. It ships with an NPL Traceability Certification, supporting quality control documentation requirements in calibrated inspection environments. Machinists, quality technicians, and tool-room inspectors use this gage as part of thread inspection routines on production and prototype parts.

This gage is suited for inspection of M12 x 1.75 externally threaded parts in manufacturing, machining, and assembly environments. It is used wherever metric Class 6G thread tolerance verification is required, including automotive, aerospace, and general industrial applications. The Go gage is used in combination with a No-Go gage to establish a complete pass-fail inspection protocol for external threads. Single-ring construction keeps handling simple and reduces the risk of confusing Go and No-Go results during high-volume inspection workflows.

Key Features

• Go gage confirms threads meet Class 6G minimum material condition
• M12 x 1.75 metric thread size for standard metric fastener inspection
• Oil Hardened Non-Shrinking Steel (OHNS) construction for dimensional stability
• Single-ring design for straightforward Go-only inspection tasks
• NPL Traceability Certification included for quality system compliance

Compatibility

Designed for inspection of external metric threads sized M12 x 1.75 to Class 6G tolerance per applicable metric thread standards.

Installation Notes

Thread ring gages are handled and used by quality technicians and machinists in inspection environments, not installed in mechanical systems. Store the gage in its protective case when not in use to prevent damage to the thread form. Clean threads on both the gage and the workpiece before each use to ensure accurate results. Periodic recalibration against a traceable standard is required to maintain measurement integrity; follow your facility quality program for recalibration intervals.