Vermont Gage 112321470 Class Zz Plus Plug Gage 21.47mm

Product Description

The VERMONT GAGE 112321470 is a Class ZZ Plus plug gage with a 21.47 mm diameter, manufactured from tool steel and finished to a 10 micro surface finish. It is used to verify that bored, drilled, or reamed holes fall within specified dimensional tolerances. The gage holds a tolerance of 0.005 mm (0.00508 mm actual), making it suitable for go inspection applications where precise hole acceptance is required. Each unit ships with a Certificate of Accuracy that includes NIST traceability, meeting the documentation requirements common in quality-controlled manufacturing and calibration environments. Licensed calibration technicians, machinists, and quality control inspectors are the primary users.

This plug gage is designed for go inspection use in machine shops, production floors, and metrology labs. It works alongside set micrometers, verniers, and other precision measuring devices to confirm hole diameter conformance during in-process or final inspection. The 21.47 mm diameter makes it appropriate for medium-bore applications in both light manufacturing and general industrial settings. Its overall length of 2.0000 inches suits standard handle holders used in bench or floor inspection setups. Conformance is governed by ASME B89.1 standards.

Key Features

• Class ZZ Plus tolerance classification per ASME B89.1 for go inspection
• 21.47 mm gage diameter with 0.005 mm tolerance
• Tool steel construction for wear resistance and dimensional stability
• 10 micro surface finish for accurate, repeatable contact measurement
• Includes Certificate of Accuracy with NIST traceability
• Overall length of 2.0000 inches compatible with standard gage handles

Compatibility

Designed for use as a go plug gage with standard gage handle holders accepting a 21.47 mm diameter pin. Compatible with set micrometers, verniers, and other measuring devices used in go inspection workflows per ASME B89.1.

Installation Notes

Plug gages are handled and used by calibration technicians, machinists, and quality inspectors — not installed in a mechanical system. Store the gage in its protective case when not in use to prevent surface damage and dimensional drift. Clean contact surfaces before each use and avoid dropping or striking the gage, as impact can alter the ground diameter. Follow your facility calibration schedule and refer to ASME B89.1 for inspection and recalibration intervals.