Vermont Gage 112108420 Class Zz Plus Plug Gage 8.42 Mm

Product Description

The VERMONT GAGE 112108420 is a Class ZZ Plus plug gage designed for precise bore and hole inspection in machine shops, quality labs, and production environments. Ground from tool steel to a 10 microfinish surface, it measures a nominal diameter of 8.42 mm with a tolerance of 0.005 mm (0.00508 mm actual). Each unit ships with a Certificate of Accuracy traceable to NIST, satisfying documentation requirements under quality management systems. Metrology technicians, machinists, and quality inspectors use this type of gage to confirm whether a bored or drilled feature meets its specified limits before parts advance to the next production stage.

This plug gage is suited for go-type inspection of holes nominally sized at 8.42 mm across residential, commercial, and industrial precision manufacturing applications. It is also appropriate as a reference setting master for micrometers, verniers, bore gages, and other measuring devices that require a known physical standard. The compact overall length of 2.0000 inches makes it easy to handle in tight-tolerance inspection setups. Manufactured to ASME B89.1 standards, it integrates smoothly into inspection workflows governed by that specification.

Key Features

• Class ZZ Plus tolerance class per ASME B89.1 for go-type hole inspection
• 8.42 mm nominal diameter with 0.005 mm tolerance
• 10 microfinish surface for repeatable, low-wear measurement contact
• Tool steel construction for durability in production inspection use
• Includes Certificate of Accuracy with NIST traceability
• Overall length of 2.0000 inches for compact handling

Compatibility

Designed as a go-type plug gage for inspecting holes nominally sized at 8.42 mm. Also suitable as a setting standard for micrometers, verniers, and other measuring devices requiring a traceable physical reference.

Installation Notes

Plug gages are used by metrology technicians and machinists and require no installation in the traditional sense. Before use, clean both the gage and the part bore thoroughly to remove chips, coolant, and debris that could affect the reading or damage the gage surface. Never force a plug gage into an undersized hole, as this can damage the gage and invalidate its calibration. Store the gage in a protective case away from other tooling to preserve the ground surface and maintain traceability.