Spi 34-301-2 Plug Thread Gage 9/16-24 6H Single End Go

Product Description

The SPI 34-301-2 is a single-end Go plug thread gage machined from steel and used to verify the minimum material condition of internal threaded features. It checks that a tapped hole or threaded bore meets the required 9/16-24 thread form and falls within the 6H tolerance class. When the Go member passes through the threaded feature without interference, the hole is confirmed acceptable at the low limit. This gage is used by machinists, quality control inspectors, and production floor technicians in any environment where threaded fastener integrity must be verified before assembly. A size 3 handle is required for use but is not included with this gage.

This gage suits inspection of 9/16-24 internal threads in precision machined parts, aerospace components, automotive assemblies, and general industrial manufacturing. It is appropriate for both incoming inspection and in-process quality checks. The 6H tolerance class is the standard for general-purpose metric and unified fine-thread gaging applications where consistent fit and function are required. Facilities following ANSI standards and requiring NIST-traceable calibration documentation will find this gage compliant with those requirements.

Key Features

• Go member verifies minimum material condition of 9/16-24 internal threads
• 6H tolerance class suits general-purpose precision thread inspection
• Steel construction provides durability in production and inspection environments
• NIST traceability certification included for calibration documentation requirements
• Meets ANSI and NIST standards for thread gaging
• Single-end design for dedicated Go-only inspection workflow

Compatibility

Designed for use with a size 3 plug gage handle, which is sold separately. Suitable for inspecting any internal 9/16-24 thread ground to 6H tolerance class per ANSI standards.

Installation Notes

Thread plug gages are installed and used by quality control technicians and machinists. Before gaging, ensure the threaded bore is clean and free of chips, coolant, or burrs that could damage the gage or produce a false reading. Apply light hand pressure only when inserting the Go member — never force the gage with tools, as this can damage both the gage and the workpiece. Store the gage in its protective case when not in use to preserve calibration integrity and surface condition.