Spi 37-134-4 Plug Thread Gage M33x3.5 6H Single End Go

Product Description

The SPI 37-134-4 is a single-end Go plug thread gage designed to verify internal thread conformance on M33x3.5 metric threads to the 6H tolerance class. The Go member checks that a threaded bore falls within the maximum material condition, confirming the thread will accept a mating fastener without interference. This gage is used by machinists, quality control inspectors, and tool room technicians to enforce dimensional acceptance criteria during production or incoming inspection. A handle is not included and must be sourced separately to suit the operator's preference or shop standard.

This gage is suited for manufacturing, fabrication, and inspection environments where M33x3.5 metric internal threads must be verified against 6H class tolerances. Typical applications include aerospace, heavy equipment, and industrial machinery shops where large-diameter metric fastener bores require documented dimensional verification. The single-end Go configuration is appropriate when a dedicated No-Go gage is already in use or when only Go acceptance checking is required at a given inspection station.

Key Features

• Go member checks M33x3.5 internal threads to 6H tolerance class
• Single-end configuration for focused Go acceptance inspection
• ANSI traceability certification included for documentation and audit compliance
• Calibration traceable to NIST standards
• Handle not included, allowing compatibility with standard plug gage handles of the operator's choice
• Compact form factor suitable for bench or floor inspection use

Compatibility

Designed for use with standard plug gage handles sized to accept the gage member. Verify handle bore compatibility before use. Intended to inspect M33x3.5 metric internal threaded bores held to 6H tolerance class per applicable metric thread standards.

Installation Notes

Thread gages are precision instruments and should be handled by qualified inspection or metrology personnel. Do not force the Go member into a threaded bore; smooth entry under hand pressure indicates an acceptable thread condition. Store the gage in a protective case away from moisture, chips, and abrasive contaminants to preserve calibration. Periodic recalibration against NIST-traceable masters is recommended per your facility's quality management system requirements.