Vermont Gage 112104900 Class Zz Plus Plug Gage 4.9 Mm

Product Description

The VERMONT GAGE 112104900 is a Class ZZ Plus plug gage designed for dimensional inspection of bored holes and machined features. Manufactured from tool steel with a 10 microfinish surface coating, this gage checks whether a hole falls within acceptable size limits using the Go method. The nominal diameter is 4.90 mm with a tolerance of 0.005 mm, making it suited for precision quality control applications. Each unit ships with a Certificate of Accuracy traceable to NIST, supporting documentation requirements in regulated manufacturing and inspection environments. Machinists, toolroom technicians, and quality control inspectors are the primary users.

This plug gage is used in production and inspection settings where bore diameter verification is required on machined components. Typical applications include Go inspection of drilled, reamed, or bored holes in metal or plastic parts. It is also suitable for setting and verifying micrometers, verniers, and other measuring devices. The 4.90 mm size fits common small-bore inspection tasks in precision machining, tooling, and assembly operations across both job-shop and production-line environments.

Key Features

• Class ZZ Plus tolerance grade for Go inspection of 4.90 mm diameter bores
• Tool steel construction for wear resistance and dimensional stability
• 10 microfinish surface coating for accurate, repeatable contact
• Complies with ASME B89.1 dimensional gage standards
• Includes Certificate of Accuracy with NIST traceability for quality records
• Compact overall length of 2.0 inches for easy handling in confined inspection setups

Compatibility

Designed for Go inspection of 4.90 mm diameter bores and for setting micrometers, verniers, and other measuring devices per ASME B89.1 requirements.

Installation Notes

Plug gages are handled and used by machinists and quality control technicians - no power tools or utilities need to be shut down before use. Store the gage in its protective case when not in use and keep it free of chips, coolant, and debris that can affect accuracy. Do not force the gage into a bore; apply only light hand pressure to avoid damaging the gage or the workpiece. Periodic cleaning and recalibration against NIST-traceable standards is recommended to maintain measurement integrity.