Spi 34-339-2 Plug Thread Gage 1-64 2B Double End

Product Description

The SPI 34-339-2 is a double-end plug thread gage used to verify internal thread quality to NIST-traceable standards. One end carries the Go member and the other carries the No Go member, allowing a technician to confirm both the minimum and maximum acceptable thread form in a single tool. The gage is machined from steel and rated for Class 2B thread tolerance, which is the standard fit class for most commercial and industrial threaded fastener applications. A handle is included. This tool is used by machinists, quality control inspectors, and precision manufacturing technicians to inspect 1-64 UNC tapped holes.

The 34-339-2 is designed for inspection of number 1-64 UNC internal threads in production and quality assurance environments. Class 2B tolerance gages are commonly used on general-purpose threaded components where a controlled fit is required but close-tolerance or precision fits are not specified. The double-end configuration keeps both Go and No Go members on one tool, reducing handling time during inspection routines. This gage is appropriate for use in machine shops, assembly lines, and any facility performing thread verification to NIST standards.

Key Features

• Double-end design combines Go and No Go members in a single tool
• Rated for Class 2B thread tolerance, the standard for general commercial threaded applications
• Traceable to NIST standards with traceability certification included
• Steel construction for durability in production inspection environments
• Handle included for secure grip during use

Compatibility

Designed for inspection of number 1-64 UNC Class 2B internal threads. Verify thread specification against your engineering drawing before use to confirm this gage matches the required thread class and tolerance.

Installation Notes

Thread gages are inspection tools, not cutting or forming tools. Do not force the Go member through a tapped hole, and never force the No Go member to pass. Store the gage in a protective case away from abrasive materials to preserve calibration. Periodic recalibration against a NIST-traceable master is recommended per your facility quality management plan.