Spi 34-357-4 Plug Thread Gage 5-44 2B Double End Go No Go

Product Description

The SPI 34-357-4 is a double-end plug thread gage designed to verify internal thread conformance to the 5-44 UNC thread form at 2B tolerance class. One end carries the Go member and the other carries the No Go member, allowing a technician to confirm both the minimum and maximum material conditions in a single tool. The gage ships with a handle included and comes with a traceability certification traceable to NIST standards. Steel construction provides the dimensional stability required for repeatable thread inspection in a shop or field environment.

This gage is used wherever precise internal thread verification is required for 5-44 threaded holes. Typical applications include quality control inspection of small fastener holes in precision assemblies, machine components, and instrumentation hardware. The 2B classification covers the standard commercial and industrial tolerance range for unified inch threads, making this gage appropriate for general manufacturing inspection as well as incoming and outgoing product audits.

Key Features

• Double-end design combines Go and No Go members in one tool for efficient single-setup inspection
• 5-44 thread size with 2B class tolerance for standard unified inch thread verification
• NIST-traceable certification included for documentation and calibration recordkeeping
• Steel construction for dimensional stability and wear resistance in production environments
• Handle included — no separate handle purchase required out of the box

Compatibility

Designed for inspection of internal 5-44 unified thread forms held to 2B tolerance class. Suitable for use in any application requiring conformance verification to NIST-referenced thread standards.

Installation Notes

Plug thread gages are installed and used by quality control inspectors, machinists, and precision assembly technicians. Before use, ensure the threaded hole is clean and free of chips or debris to avoid false rejections and premature gage wear. Apply light gage oil or thread lubricant during inspection to protect the gage members and extend service life. Store the gage in its protective case when not in use to prevent damage to the precision thread form.