Vermont Gage 112120300 Class Zz Plus Plug Gage 20.3mm

Product Description

The VERMONT GAGE 112120300 is a Class ZZ Plus plug gage designed for go inspection of bored, reamed, or machined holes at a nominal diameter of 20.3 mm. Manufactured from tool steel with a 10 microinch surface finish, this gage delivers consistent, reliable measurements in high-tolerance production and quality-control environments. The part meets ASME B89.1 standards and ships with a Certificate of Accuracy backed by NIST traceability, making it suitable for calibrated measurement programs. Machinists, quality technicians, and metrology professionals use this type of gage to verify that a hole falls within the acceptable minimum size limit before a workpiece moves to the next stage of production.

This plug gage is appropriate for use in manufacturing shops, machine shops, and inspection labs where dimensional verification of internal diameters is required. It is compatible with go inspection workflows and can be used alongside set micrometers, verniers, and other measuring devices to maintain a calibrated reference standard. The 20.3 mm diameter makes it well suited for metric-dimensioned components common in automotive, aerospace, and general industrial part production. Its compact overall length of 2 inches allows easy handling in tight-tolerance inspection stations.

Key Features

• Class ZZ Plus tolerance grade with 0.00508 mm tolerance for precise go inspection
• 10 microinch surface finish for consistent gage-to-bore contact
• Manufactured from tool steel for hardness and wear resistance
• Meets ASME B89.1 standard for plain plug gages
• Includes Certificate of Accuracy with NIST traceability for calibration documentation
• Compact 2-inch overall length for practical bench and floor use

Compatibility

Designed for go inspection applications and compatible for use with set micrometers, verniers, and other measuring devices requiring a traceable dimensional reference at 20.3 mm diameter.

Installation Notes

Plug gages are installed and used by quality technicians and machinists following standard metrology practices. Before use, clean the gage and the workpiece bore thoroughly to remove chips, coolant, or debris that could affect readings. Never force a plug gage into a bore; if resistance is felt, the hole is undersized and should be re-machined or evaluated. Store the gage in its protective case when not in use to prevent corrosion and damage to the lapped surface finish.