Spi 34-312-9 Plug Thread Gage 5/8-24 6H No Go

Product Description

The SPI 34-312-9 is a single-end No Go plug thread gage designed to verify internal thread quality on 5/8-24 threaded holes to the 6H tolerance class. The gage checks that a threaded feature does not accept an out-of-tolerance condition, providing a fast pass/fail result at the workbench or on the production floor. Manufactured from steel and traceable to NIST standards under ANSI requirements, this gage is a staple tool for quality control technicians, machinists, and inspection personnel working with fine-pitch unified threads. A size 3 handle is required but not included.

This plug thread gage is used in manufacturing, machining, and quality inspection environments wherever 5/8-24 internally threaded components must meet 6H class tolerances. Typical applications include inspection of threaded bores in mechanical assemblies, hydraulic fittings, and precision-machined components. The No Go member confirms that the thread pitch diameter does not exceed the maximum material condition limit. This gage is suited for use in both production-line inspection and incoming-material verification workflows.

Key Features

• No Go member verifies 5/8-24 internal threads do not exceed 6H tolerance limits
• Single-end design for dedicated No Go inspection without risk of mixing members
• Steel construction for durability and dimensional stability in shop environments
• NIST-traceable calibration certificate included for documentation and audit requirements
• Meets ANSI and NIST standards for thread gage accuracy
• Compatible with standard size 3 gage handles (sold separately)

Compatibility

Designed for use with size 3 plug gage handles (not included). Suitable for inspecting 5/8-24 internally threaded features requiring 6H class conformance per ANSI standards.

Installation Notes

This gage is installed by quality technicians or machinists onto a compatible size 3 handle before use. Keep the gage clean and lightly oiled when not in use to prevent corrosion and maintain dimensional accuracy. Do not force the No Go member through a threaded hole; resistance indicates the thread is within specification. Store in a protective case away from impacts and temperature extremes to preserve calibration integrity.