Vermont Gage 112120740 Class Zz Plus Plug Gage 20.74 Mm

Product Description

The VERMONT GAGE 112120740 is a Class ZZ Plus plug gage designed for precise bore and hole inspection in industrial and toolroom environments. Built from tool steel with a 10 micro finish, this plug gage holds a tolerance of 0.00508 mm, making it suitable for high-accuracy go inspection workflows. At 2.0000 inches overall length and a nominal diameter of 20.74 mm, it provides a rigid, reliable gauge member for checking whether a feature falls within its allowable size. Each unit ships with a Certificate of Accuracy backed by NIST traceability, confirming it meets ASME B89.1 standards. Machinists, quality technicians, and metrologists rely on this type of gage for fast, repeatable attribute inspection on the shop floor or in a calibration lab.

This plug gage is used for go inspection of holes and bores measuring 20.74 mm in diameter. Typical applications include verifying machined bores, checking die and mold features, and setting or confirming micrometers, verniers, and other measuring devices. It is well suited to production inspection stations, incoming quality control, and toolroom calibration tasks where dimensional conformance to a tight tolerance must be confirmed quickly and consistently.

Key Features

• Class ZZ Plus tolerance class: 0.00508 mm tolerance for precise attribute inspection
• Tool steel construction with 10 micro finish for durability and surface accuracy
• Nominal diameter of 20.74 mm for go inspection of matching bore features
• Overall length of 2.0000 inches provides a manageable, stable gage member
• Includes Certificate of Accuracy with NIST traceability
• Manufactured to ASME B89.1 standards

Compatibility

Designed for go inspection of 20.74 mm diameter bores and holes. Also suitable for setting micrometers, verniers, and other measuring devices requiring a certified reference standard at this diameter.

Installation Notes

Plug gages are handled and used by quality technicians, machinists, and metrologists — no power source or utility shutoff is required. Store the gage in its protective case when not in use to prevent corrosion and surface damage to the tool steel. Apply a light coat of instrument oil before storage if the gage will not be used for an extended period. Do not force the gage into a bore; resistance indicates the feature is out of tolerance or the bore contains debris.