Spi 34-347-5 Plug Thread Gage 3-48 2B Double End

Product Description

The SPI 34-347-5 is a double-end plug thread gage designed to verify internal thread conformance to the 3-48 thread specification at a 2B tolerance class. One end carries the Go member and the opposite end carries the No Go member, allowing a technician to confirm both minimum material condition and maximum material condition in a single tool. The gage ships with a handle included. A NIST-traceable calibration certificate is included, making this gage suitable for documented quality control processes on the shop floor or in a metrology lab. The tool weighs 1 pound and is constructed of steel for dimensional stability under repeated use.

This gage is intended for use in precision machining, manufacturing inspection, and quality assurance environments where threaded fastener holes must be verified against ANSI or ASME thread standards. The 3-48 designation indicates a Number 3 nominal diameter with 48 threads per inch, a fine-pitch unified thread commonly found in small instrument components, electronics hardware, and precision mechanical assemblies. Licensed metrology technicians, quality inspectors, and precision machinists are the primary users of this tool.

Key Features

• Double-end design with Go and No Go members on a single gage body for efficient pass-fail inspection
• 3-48 thread size with 2B tolerance class conformance
• NIST-traceable traceability certification included for documented quality systems
• Handle included — no separate handle purchase required
• Steel construction for wear resistance and dimensional stability

Compatibility

Designed as an OEM-style thread inspection gage for internal 3-48 UNC/UNF threaded features inspected to 2B class tolerance requirements.

Installation Notes

Thread plug gages are hand-operated inspection tools requiring no power source or permanent installation. The Go member should pass fully through a conforming threaded hole under finger pressure only — do not force the gage. The No Go member should not enter more than two turns of a conforming threaded hole. Follow your facility gauge management program and applicable ASME B1.2 or ASME B47.1 standards for gage calibration intervals and handling procedures.