Spi 37-148-4 Plug Thread Gage M5x0.8 6H No Go

Product Description

The SPI 37-148-4 is a single-end plug thread gage configured as a No Go member for inspecting M5x0.8 metric threads to the 6H tolerance class. It is used to verify that an internal thread has not been cut oversized or damaged beyond the upper limit of the specified tolerance. The gage body measures 1.15 inches in length and 0.2 inches in diameter and weighs 0.066 pounds. A handle is not included and must be sourced separately. This gage is traceable to NIST standards and is supplied with an ANSI traceability certification, making it suitable for quality-control documentation requirements in precision manufacturing and inspection environments.

This gage is intended for use in machine shops, production floors, and quality-control inspection stations where M5x0.8 threaded holes must be verified to 6H classification. Typical applications include inspection of tapped holes in aerospace components, automotive parts, medical device housings, and general precision machined assemblies. A licensed machinist, quality inspector, or metrology technician performs the inspection. The No Go member is used in conjunction with a separate Go gage to confirm full conformance to the specified thread tolerance; only the No Go function is provided by this part.

Key Features

• No Go configuration verifies internal threads do not exceed the upper tolerance limit for 6H class
• M5x0.8 thread size for standard metric fine-pitch thread inspection
• Single-end design for straightforward pass-fail inspection workflows
• NIST-traceable with ANSI traceability certification included
• Compact at 1.15 inches length and 0.066 pounds for easy bench or portable use
• Handle not included, allowing use with a standard compatible gage handle

Compatibility

Designed for use with standard plug gage handles compatible with the gage diameter. Intended for inspection of M5x0.8 internal threads held to 6H tolerance class per applicable metric thread standards.

Installation Notes

This gage is installed and used by machinists, quality control inspectors, or metrology technicians. Before use, ensure the threaded hole is clean and free of chips or coolant that could affect measurement accuracy. Apply the No Go gage by hand without forcing; if the gage enters the thread, the part is out of tolerance and should be rejected. Do not use power tools or excessive torque when applying any thread plug gage, as this can damage both the gage and the part under inspection.