Vermont Gage 112312550 Class Zz Plus Plug Gage 12.55mm

Product Description

The VERMONT GAGE 112312550 is a Class ZZ Plus cylindrical plug gage with a 12.55 mm diameter, designed for precision go inspection of machined bores and holes. Built from tool steel with a 10 microfinish surface finish, it holds a tolerance of 0.00508 mm, making it suitable for high-accuracy dimensional verification in machine shops, metrology labs, and quality control environments. Each unit ships with a Certificate of Accuracy with NIST Traceability, confirming conformance to ASME B89.1 standards. Machinists, quality technicians, and toolroom professionals rely on this gage to confirm that a bore meets its minimum acceptable size before assembly or further processing.

This plug gage is used for go inspection of precision-machined internal features. Typical applications include verifying bore diameters on machined components in manufacturing and toolroom environments. It is also compatible with use alongside set micrometers, verniers, and other calibrated measuring devices for comparative measurement workflows. Its compact overall length of 2.0 inches makes it manageable for benchtop and in-process inspection tasks.

Key Features

• Class ZZ Plus tolerance rating at 0.00508 mm for precision go inspection
• 12.55 mm nominal diameter with 10 microfinish surface finish
• Constructed from tool steel for durability and dimensional stability
• Includes Certificate of Accuracy with NIST Traceability
• Conforms to ASME B89.1 dimensional gage standards
• Compact 2.0-inch overall length for ease of handling

Compatibility

Designed for go inspection of 12.55 mm internal bores; suitable for use with set micrometers, verniers, and other calibrated measuring devices per the stated application data.

Installation Notes

Plug gages are handled and used by machinists and quality control technicians. Clean the gage and the bore thoroughly before use to prevent debris from affecting readings or damaging the gage surface. Apply light gauge oil when appropriate to protect the tool steel finish and the workpiece bore. Do not force the gage through an undersize bore, as this can scratch the microfinish surface and compromise gage accuracy.