Spi 34-515-7 Threaded Ring Gage M27x3 Class 6G Go

Product Description

The SPI 34-515-7 is a Class 6G Go threaded ring gage designed to verify external metric threads to the M27 x 3.00 specification. This single-ring gage is manufactured from Oil Hardened Non-Shrinking Steel (OHNS), a tool steel known for dimensional stability and resistance to wear during repeated gauging cycles. It is used to confirm that a threaded workpiece falls within the acceptable tolerance limits for a Class 6G fit — meaning the Go gage must pass over the thread freely. An NPL Traceability Certification is included, making it suitable for shops operating under documented quality systems. Machinists, quality technicians, and tool room professionals use this gage as part of thread inspection routines.

This gage is suited for thread inspection in precision machining environments, toolrooms, and manufacturing quality control stations where M27 x 3.00 metric external threads must be verified against Class 6G tolerance limits. It is appropriate for both production floor and incoming inspection applications where traceability to national standards is required. The single-ring design covers the Go function only, so a separate No-Go ring gage is required to complete a full thread acceptance check.

Key Features

• Go ring gage confirms external M27 x 3.00 threads meet Class 6G tolerance limits
• Oil Hardened Non-Shrinking Steel (OHNS) construction for wear resistance and dimensional stability
• NPL Traceability Certification included for quality system compliance
• Single-ring configuration — dedicated Go function for streamlined inspection workflow
• Ready for immediate use in production or toolroom environments

Compatibility

Designed for inspection of external metric threads with an M27 x 3.00 thread form and a Class 6G tolerance classification. Intended for use as a Go gage only; pair with a compatible Class 6G No-Go threaded ring gage to perform complete thread acceptance inspection.

Installation Notes

Threaded ring gages are handled and applied by machinists or quality control technicians — no power tools or electrical shutoff is required. Before use, clean the gage and the workpiece thread to remove chips, coolant, and debris, as contamination will affect gauging accuracy. Apply a light gage oil to the gage threads to reduce wear and extend service life. Store the gage in its protective case when not in use, and have it recalibrated at regular intervals per your facility quality plan to maintain traceability.