Vermont Gage 301000000 Plug Gauge 9/16-12 Unc Go/no-go

Product Description

The VERMONT GAGE 301000000 is a Go/No-Go threaded plug gauge designed to verify the internal thread dimensions of 9/16 inch-12 UNC tapped holes. Built to Tolerance Class X, this gauge provides the precision required for thread inspection in manufacturing, maintenance, and quality control environments. The Go member confirms that a threaded hole will accept a mating fastener within specification, while the No-Go member confirms the hole has not been overtapped. The chrome-plated gauge members are hardened to RC 70/72 for long service life and wear resistance. A Certificate of Accuracy is included, and the gauge is calibrated to ISO 17025 accredited standards. Installed and used by machinists, QC inspectors, and maintenance technicians.

This plug gauge is suited for inspection of right-hand 9/16 inch-12 UNC internal threads in both shop-floor and tool-room settings. The Taperlock 3B handle assembly uses a light blue handle for quick Class 3B identification in a gauge crib or toolbox. The assembly design allows Go and No-Go members to be mounted on the included Taperlock handle for efficient single-tool inspection. Typical applications include production thread verification, incoming inspection, and in-process quality checks on threaded components machined to UNC standards.

Key Features

• Go member pitch diameter of 0.5084 inches and No-Go member pitch diameter of 0.5135 inches for Class 3B thread verification
• Tolerance Class X for high-precision thread gauging
• Chrome-plated gauge members hardened to RC 70/72 for extended wear life
• Right-hand thread direction, UNC thread form
• Includes Certificate of Accuracy calibrated to ISO 17025 accredited standards
• Light blue Taperlock 3B handle assembly for fast class identification

Compatibility

Designed to inspect right-hand 9/16 inch-12 UNC internal threads to Thread Class 3B. Compatible with standard Taperlock handle systems for Go/No-Go plug gauge assemblies.

Installation Notes

Thread plug gauges are used by QC inspectors and machinists and require no permanent installation. Handle the gauge members carefully to avoid nicks or burrs that would affect accuracy. Store gauge members in a protective case when not in use and re-calibrate periodically per your facility quality plan. Do not force the Go member into a thread; if it does not pass freely, the thread is out of specification.