Vermont Gage 112112780 Class Zz Plus Plug Gage 12.78mm

Product Description

The VERMONT GAGE 112112780 is a Class ZZ Plus plug gage designed for go inspection of precision bored holes and machined features. Manufactured from tool steel with a 10 micro finish, this gage checks whether a hole or bore meets its minimum acceptable size. It carries a 0.005 mm tolerance and measures a nominal diameter of 12.78 mm. Each unit ships with a Certificate of Accuracy traceable to NIST, making it suitable for calibrated measurement environments. Licensed machinists, toolroom technicians, and quality control inspectors install and use this gage in production and inspection workflows.

This plug gage is used in machine shops, manufacturing facilities, and quality labs where hole size must be verified against a go/no-go acceptance criterion. It is sized for a 12.78 mm nominal diameter bore and is applicable to go inspection routines. It is also used to set and verify micrometers, verniers, and other measuring devices where a known reference diameter is required. The overall length is 2.0000 inches, making it compatible with standard gage handle systems.

Key Features

• Class ZZ Plus tolerance: 0.005 mm, suitable for general-purpose go inspection
• Tool steel construction with 10 micro surface finish for consistent wear characteristics
• Conforms to ASME B89.1 dimensional gage standards
• Includes Certificate of Accuracy with NIST traceability for calibrated environments
• Compatible with standard gage handle systems for secure, repeatable use
• Applicable for setting micrometers, verniers, and other precision measuring devices

Compatibility

Designed for go inspection of 12.78 mm diameter bores and as a reference standard for setting micrometers, verniers, and comparable measuring devices per ASME B89.1.

Installation Notes

Plug gages are handled and applied by toolroom technicians and quality control personnel, not field tradespeople. Before use, clean the gage and bore surfaces to remove chips, oil, and debris that could produce false readings. Store the gage in its protective case when not in use to prevent surface damage and corrosion. Do not force the gage into a bore; controlled hand pressure is the correct application method.