Spi 37-214-4 Plug Thread Gage M36x4 6H Double End

Product Description

The SPI 37-214-4 is a double-end plug thread gage used to verify internal M36x4 metric threads to the 6H tolerance class. One end is the Go member and the opposite end is the No Go member, allowing a technician to confirm both the minimum and maximum thread limits in a single tool. The handle is included. Traceability certification meets ANSI standards with NIST traceability, making this gage suitable for quality-control environments where documented calibration records are required. Machinists, tooling engineers, and quality inspectors use this gage on the shop floor or in inspection departments to accept or reject threaded bores before assembly.

This gage is appropriate for production inspection of large-diameter internally threaded components such as flanges, housings, and structural weldments that call out M36x4 threads at the 6H fit class. The double-end configuration speeds inspection by eliminating the need to handle two separate gages. It is well suited for industries including heavy equipment manufacturing, oil and gas, structural fabrication, and aerospace where metric thread conformance must be verified against international standards.

Key Features

• Go and No Go members on a single double-end gage for complete 6H thread verification
• Thread size M36x4 for large-diameter metric internal thread inspection
• 6H tolerance class per standard metric thread fits
• ANSI traceability certification with NIST-traceable calibration included
• Handle included — ready to use out of the box
• Compact overall dimensions support bench or floor use

Compatibility

Designed for inspection of M36x4 internal threads classified to the 6H tolerance class. Consult engineering drawings to confirm thread form and tolerance class before use.

Installation Notes

Plug thread gages are inspection tools, not cutting tools — never apply rotational force beyond hand torque, and do not force the No Go member into a threaded bore. Ensure the workpiece is secure and free of chips or coolant before gaging. Gages should be stored in their case and periodically re-calibrated according to your facility quality plan to maintain NIST-traceable accuracy.