Vermont Gage 112303890 Class Zz Plus Plug Gage 3.89mm

Product Description

The VERMONT GAGE 112303890 is a Class ZZ Plus plug gage designed for precision hole inspection and instrument calibration in machining, quality control, and metrology environments. Manufactured from tool steel with a 10 microfinish surface, this gage measures 3.89 mm in diameter and carries a tolerance of 0.005 mm, meeting ASME B89.1 standards. Each unit ships with a Certificate of Accuracy that includes NIST traceability, making it suitable for documented inspection processes. Machinists, quality technicians, and calibration professionals rely on this type of gage for fast, repeatable go-type inspection of bored or drilled features.

This plug gage is used in go inspection applications across manufacturing, tool and die, and precision machining shops. It is also suited for setting micrometers, verniers, and other measuring devices that require a certified reference. The 3.89 mm diameter makes it appropriate for small-bore inspection work where tight tolerances must be verified. It fits within standard gage-handle systems and is well-suited for both production floor use and calibration lab environments where NIST-traceable documentation is required.

Key Features

• Class ZZ Plus tolerance class: 0.005 mm tolerance for precise go inspection
• 10 microfinish surface for consistent, repeatable contact with the bore
• Tool steel construction for wear resistance in production environments
• Meets ASME B89.1 standards for dimensional gaging
• Includes Certificate of Accuracy with NIST traceability
• Overall length of 2.0000 inches for use with standard gage handles

Compatibility

Designed for use with standard plug gage handles; also used directly for setting micrometers, verniers, and other measuring devices requiring a certified 3.89 mm reference.

Installation Notes

Plug gages are handled and used by quality technicians and machinists — no permanent installation is required. Keep the gage clean and lightly oiled when not in use to prevent corrosion on the tool steel body. Do not force the gage into an undersized bore, as this can damage both the gage and the workpiece. Store in its protective case and re-certify on a schedule consistent with your quality management system requirements.