Spi 37-117-9 Plug Thread Gage M12x1.75 6H Go

Product Description

The SPI 37-117-9 is a single-end Go plug thread gage designed to verify that M12x1.75 internally threaded parts meet dimensional acceptance criteria. The gage checks that a threaded hole falls within the allowable tolerance on the tight side, confirming the thread will accept a mating fastener without interference. Built to 6H classification, it conforms to ANSI standards and is traceable to NIST, making it suitable for quality inspection environments where documentation matters. The handle is not included and must be sourced separately. At 0.22 pounds, the gage is compact and easy to use at the bench or on the floor.

This gage is used in machining, fabrication, assembly, and quality control applications where M12x1.75 metric threads must be verified before parts move to the next stage of production. It is appropriate for inspection of threaded holes in equipment housings, brackets, structural components, and mechanical assemblies across industrial and manufacturing settings. Machinists, quality technicians, and inspection personnel are the typical users.

Key Features

• Go gage confirms the threaded hole accepts a mating fastener — catches undersize or misformed threads
• M12x1.75 metric thread size, 6H tolerance classification
• ANSI standard compliance with NIST traceability for documented inspection programs
• Single-end design — handle sold separately for flexible setup with existing handle stock
• Compact form factor: 1.75 inches in length, 0.47 inches in width and height
• Lightweight at 0.22 pounds for easy bench or in-line use

Compatibility

Designed for use with any standard gage handle accepting plugs of this form factor. Verifies internally threaded M12x1.75 holes held to 6H tolerance per ANSI thread standards.

Installation Notes

Thread gages are inspection tools, not cutting tools — do not force the Go gage through a hole that offers resistance, as this can damage gage or part threads. Secure the gage in an appropriate handle before use. Keep the gage clean and lightly oiled when stored to prevent corrosion and maintain dimensional accuracy. Periodic re-certification against NIST-traceable masters is recommended to ensure continued inspection reliability.