Vermont Gage 112304930 Class Zz Plus Plug Gage 4.93mm

Product Description

The VERMONT GAGE 112304930 is a Class ZZ Plus plug gage designed for go inspection of bored, drilled, and reamed holes. Manufactured from tool steel with a 10 microfinish surface coating, this gage checks that a hole diameter meets minimum acceptable size before the part moves to the next stage of production or assembly. The gage measures 4.93 mm in diameter with a tolerance of 0.00508 mm, and its overall length is 2.0000 inches. Each unit ships with a Certificate of Accuracy that carries full NIST traceability, satisfying documentation requirements for quality systems and audits.

This plug gage is suited for dimensional inspection in machine shops, toolrooms, and manufacturing cells where hole size must be verified to tight tolerances. It is commonly used alongside set micrometers, verniers, and other precision measuring devices as part of a go/no-go inspection workflow. The Class ZZ Plus classification indicates a tighter tolerance than standard Class ZZ, making this gage appropriate for applications where dimensional accuracy is critical and measurement uncertainty must be minimized.

Key Features

• Class ZZ Plus classification with 0.00508 mm tolerance for tight-tolerance hole inspection
• Tool steel construction for wear resistance and dimensional stability
• 10 microfinish surface coating reduces friction and wear during repeated use
• Overall length of 2.0000 inches for easy hand use in standard gage handles
• Includes Certificate of Accuracy with NIST traceability for quality system compliance
• Manufactured to ASME B89.1 standards

Compatibility

Designed for use in go inspection applications with set micrometers, verniers, and other precision measuring devices where a 4.93 mm nominal hole diameter must be verified.

Installation Notes

Plug gages are handled and used by machinists, quality technicians, and toolroom personnel. Store the gage in its protective case when not in use to prevent damage to the precision-ground surface. Clean the gage and the hole being inspected before each use to avoid false readings caused by chips, coolant, or debris. Do not force the gage into an undersized hole, as this can damage the gage surface and compromise its calibration.