Spi 34-431-7 Plug Thread Gage 1-12 2B Go No Go

Product Description

The SPI 34-431-7 is a double-end plug thread gage designed to verify internal thread conformance to 1-12 thread size at 2B classification. One end serves as the Go gage to confirm minimum material condition, while the opposite No Go end checks that threads have not been cut oversize. The steel construction provides the dimensional stability required for repeatable inspection work in production or maintenance environments. A handle is included, sized at 4, so the gage is ready to use out of the box. NIST traceability certification ships with the gage, supporting quality documentation requirements in regulated or audited shops.

This gage is used wherever tapped holes with a 1-12 thread form must be verified before assembly. Typical applications include inspection of threaded bores in machined components, valve bodies, fittings, and mechanical assemblies. It is suited for use in manufacturing, maintenance, and quality control settings where thread conformance to NIST standards must be documented. The double-end design eliminates the need for two separate gages, making it a compact solution for bench or floor inspection use.

Key Features

• Double-end design integrates Go and No Go checks in a single tool
• Verifies 1-12 internal threads to 2B classification
• Steel construction for dimensional stability and wear resistance
• NIST traceability certification included for quality documentation
• Handle included — no additional purchase required for immediate use

Compatibility

Designed for inspection of internal threads with a 1-12 thread size and 2B classification. Suitable for use in any application requiring conformance verification to NIST standards for this thread form.

Installation Notes

Thread gages are handled and used by machinists, quality technicians, and maintenance professionals. Before use, clean and inspect the gage for nicks or wear that could affect accuracy. Apply the Go end first to confirm the thread accepts it freely, then apply the No Go end to confirm it does not fully engage. Store the gage in its protective case when not in use to prevent damage to the precision ground surfaces.