Vermont Gage 112101220 Class Zz Plus Plug Gage 1.22mm

Product Description

The VERMONT GAGE 112101220 is a Class ZZ Plus plug gage designed for precision go inspection of small bores and holes. Manufactured from tool steel with a 10 microfinish surface finish, this gage provides a tolerance of 0.00508 mm, making it suitable for high-accuracy dimensional verification in production and quality control environments. The 1.22 mm diameter pin is ground and lapped to ASME B89.1 standards and ships with a Certificate of Accuracy traceable to NIST. Licensed metrologists, quality technicians, and machining professionals use this gage to confirm whether a feature falls within acceptable limits.

This plug gage is used in manufacturing, inspection labs, and machine shops where small-diameter bore verification is required. It is appropriate for use with go inspection routines and as a reference standard when setting micrometers, vernier calipers, and other measuring devices. The 2.0000 inch overall length provides adequate handling for bench and floor inspection work. Applications span aerospace, automotive, medical device, and general precision machining operations where tight dimensional tolerances must be confirmed before assembly.

Key Features

• Class ZZ Plus tolerance grade per ASME B89.1 for reliable go inspection
• 1.22 mm diameter with 0.00508 mm tolerance for precise bore verification
• 10 microfinish surface finish minimizes measurement variability
• Tool steel construction for durability and dimensional stability
• Includes Certificate of Accuracy with NIST traceability
• Suitable for setting micrometers, verniers, and other measuring devices

Compatibility

Designed for go inspection of 1.22 mm diameter bores and holes. Compatible with standard plug gage handles and suitable for use as a reference when calibrating or setting micrometers, vernier calipers, and similar measuring instruments.

Installation Notes

Plug gages of this type are handled and used by quality technicians and inspection personnel, not installed in the traditional sense. Store the gage in its protective case when not in use to prevent surface damage and corrosion. Apply a light coat of instrument oil before storage to preserve the tool steel surface. Do not force the gage into a bore; a go gage should pass under its own weight or with minimal hand pressure to avoid wear or damage to the gage or workpiece.