Spi 37-190-6 Plug Thread Gage M8x1 6H Class Double End

Product Description

The SPI 37-190-6 is a double-end plug thread gage designed to inspect M8x1 metric threads to the 6H tolerance class. It provides both Go and No Go inspection in a single tool, allowing machinists and quality control technicians to verify that threaded bores fall within acceptable dimensional limits. The Go end confirms the thread can accept a mating fastener, while the No Go end confirms the bore has not been cut oversize. A handle is included. The gage ships with an ANSI traceability certification traceable to NIST standards, making it suitable for documented inspection processes.

This gage is used in machine shops, manufacturing facilities, and precision assembly environments where M8x1 threaded holes must be verified before parts proceed to the next stage of production. It is appropriate for inspection of tapped holes in components produced for industrial, automotive, and mechanical applications where 6H class thread tolerances are specified. Quality inspectors, machinists, and tool crib personnel are the primary users.

Key Features

• Double-end design combines Go and No Go gages in one tool for efficient inspection
• Calibrated to M8x1 thread size at 6H tolerance class
• Includes handle for secure, repeatable use during inspection
• ANSI traceability certification included, traceable to NIST standards
• Compact and lightweight at 0.11 pounds for easy bench or floor use

Compatibility

Designed for inspection of M8x1 internally threaded bores held to the 6H tolerance class per standard metric thread specifications.

Installation Notes

Thread gages are inspection tools, not cutting tools. Always clean threads and the gage before use to prevent debris from affecting readings or damaging gage surfaces. The Go end should pass through the full length of the threaded hole under hand pressure only; never force it. Store the gage in its protective case when not in use to preserve calibration and surface finish.