Vermont Gage 112320690 Class Zz Plus Plug Gage 20.69 Mm

Product Description

The VERMONT GAGE 112320690 is a Class ZZ Plus plug gage designed to verify bore and hole diameters in precision machining and inspection workflows. Manufactured from tool steel with a 10 micro-inch surface finish, this gage checks a 20.69 mm diameter with a tolerance of 0.00508 mm. It ships with a Certificate of Accuracy backed by NIST traceability, making it suitable for documented quality control processes. Machinists, quality technicians, and metrologists use this type of gage for go inspection on production parts and for calibrating or verifying micrometers, verniers, and other measuring devices. The overall length is 2.0 inches, and the unit weighs 0.3 pounds.

This plug gage is used in machine shops, tool rooms, and manufacturing inspection departments handling precision components. It is appropriate for both incoming inspection and in-process quality checks where bore diameter must be confirmed to close tolerance. The Class ZZ Plus designation indicates a tighter tolerance grade than standard Class ZZ, making it well suited for applications requiring higher gage accuracy. Compatible with standard gage handle sets for ease of use during repetitive inspection cycles.

Key Features

• 20.69 mm inspection diameter with 0.00508 mm tolerance for precision go inspection
• Class ZZ Plus tolerance grade offers tighter accuracy than standard Class ZZ
• Tool steel construction for durability and dimensional stability
• 10 micro-inch surface finish supports consistent, repeatable contact measurement
• Includes Certificate of Accuracy with NIST traceability for documented QC programs
• Meets ASME B89.1 standards for plain plug gages

Compatibility

Designed for go inspection applications and compatible with standard gage handle systems. Also used to set and verify micrometers, verniers, and other measuring devices requiring a known reference diameter.

Installation Notes

Plug gages are handled and used by quality technicians and machinists; no installation in the traditional sense applies, but proper use practice is critical. Always clean the gage and the bore being inspected before use to prevent false readings or surface damage. Store the gage in its protective case when not in use to prevent corrosion and surface wear. Calibration intervals should follow your facility quality plan and applicable ASME or ISO metrology standards.