Spi 34-317-8 No Go Plug Thread Gage 3/4-16 6H Single End

Product Description

The SPI 34-317-8 is a single-end No Go plug thread gage used to verify that internal threaded features do not exceed maximum material condition limits. Manufactured from steel, it is designed for 3/4-16 UNF threads and conforms to 6H tolerance classification. The gage comes with an NIST traceability certification, supporting documentation requirements for quality control and inspection programs. A Size 3 handle is required for use but is not included with this gage. This tool is used by machinists, quality technicians, and inspection personnel on the shop floor or in a gage room environment.

This No Go plug gage is applied to inspect internally threaded bores where 3/4-16 UNF thread form and pitch diameter must be held within 6H class tolerance limits. It is suited for production inspection, incoming inspection, and first-article verification in manufacturing environments. The single-end configuration provides a compact gage member for straightforward go-nogo inspection workflows. Consistent with ANSI and NIST standards, it supports traceability requirements common in aerospace, automotive, and general precision manufacturing applications.

Key Features

• No Go thread gage member verifies maximum material condition limits for internal 3/4-16 UNF threads
• 6H classification provides the correct tolerance for standard internal threaded fastener applications
• Steel construction for durability and dimensional stability in production inspection use
• NIST traceability certification included to support calibration and quality documentation requirements
• Conforms to ANSI and NIST standards
• Single-end design accepts a Size 3 handle (sold separately)

Compatibility

Designed for use with a Size 3 gage handle (not included) and suitable for inspecting any internal 3/4-16 UNF threaded feature held to 6H class tolerance.

Installation Notes

Plug thread gages are installed and operated by qualified inspection personnel or machinists familiar with thread gage handling procedures. Always clean and deburr the threaded bore before gaging to prevent false readings or gage damage. Handle the gage member carefully to avoid nicks or surface damage that could affect measurement accuracy. Calibration intervals and storage conditions should follow the facility quality management plan and applicable ANSI gage standards.