Vermont Gage 112121580 Class Zz Plus Plug Gage 21.58mm

Product Description

The VERMONT GAGE 112121580 is a Class ZZ Plus plug gage designed for precision bore and hole inspection in quality control and metrology applications. Manufactured from tool steel with a 10 micro finish, this gage checks that a hole meets its minimum acceptable diameter for go inspection. The nominal diameter is 21.58 mm with a tolerance of 0.00508 mm, making it suitable for tight-tolerance verification work. Overall length is 2.0000 inches. Each unit ships with a Certificate of Accuracy traceable to NIST, supporting documented inspection programs. Machinists, quality technicians, and calibration professionals are the primary users of this tool.

This plug gage is used in manufacturing and inspection environments where bore diameter conformance must be verified against a go condition. Typical applications include setting and verifying micrometers, verniers, and other measuring devices, as well as direct hole inspection on machined components. It is suited for both production floor use and calibration lab environments where ASME B89.1 compliance is required. The Class ZZ Plus designation indicates a commercial-grade tolerance class appropriate for inspection of general-purpose machined holes.

Key Features

• 21.58 mm nominal diameter with 0.00508 mm tolerance for high-accuracy go inspection
• Tool steel construction with 10 micro surface finish for durability and wear resistance
• Meets ASME B89.1 standards for dimensional gages
• Includes Certificate of Accuracy with NIST traceability for documented QC programs
• 2.0000-inch overall length for standard handle compatibility
• Suitable for setting micrometers, verniers, and other precision measuring instruments

Compatibility

Designed for go inspection of bored and machined holes at 21.58 mm nominal diameter, and for use in setting micrometers, verniers, and other precision measuring devices where a traceable reference is required.

Installation Notes

Plug gages are handled and used by quality technicians and metrologists — no power source or trade license is required. Clean the gage and the bore with a lint-free cloth before use to prevent contamination that could affect readings. Store the gage in its protective case when not in use to preserve the surface finish and dimensional integrity. Do not force the gage into a hole; if resistance is encountered, remove and inspect both the gage and the workpiece for debris or burrs.