Vermont Gage 112421810 Class Zz Minus Plug Pin Gage 21.81mm

Product Description

The VERMONT GAGE 112421810 is a Class ZZ Minus plug pin gage designed for precision dimensional inspection of bore and hole diameters. It measures 21.81 mm in diameter with a tolerance of 0.00508 mm, making it suited for NoGo inspection applications where tight dimensional control is required. The gage body is machined from steel with a 10 micro-inch surface finish for consistent, repeatable contact. Overall length is 2 inches. Each unit ships with a Certificate of Accuracy traceable to NIST standards. Metrology technicians, quality control inspectors, and machinists use this gage to verify that a bore or hole does not exceed its maximum allowable size.

This plug pin gage is used in manufacturing and inspection environments where bore diameters must be held to close tolerances. It is suited for checking holes on machined parts, castings, and fabricated assemblies. The NoGo class designation means the gage is intended to reject parts with oversized bores. It is also compatible with use alongside set micrometers, verniers, and other calibrated measuring devices during setup and verification procedures. Applications span precision machining shops, quality labs, and production floor inspection stations.

Key Features

• Class ZZ Minus tolerance rating at 0.00508 mm for tight NoGo inspection use
• 21.81 mm measurement diameter for direct bore inspection
• Steel construction with 10 micro-inch surface finish for consistent gage wear and contact
• 2-inch overall length provides stable handling during inspection
• Includes Certificate of Accuracy with NIST traceability for calibration records
• Compatible with set micrometers, verniers, and other precision measuring devices

Compatibility

Designed for NoGo bore inspection and for use alongside set micrometers, verniers, and other calibrated measuring devices in precision dimensional inspection workflows.

Installation Notes

Plug pin gages are handled and applied by metrology technicians and quality control inspectors. Before use, verify the gage and the workpiece bore are at the same ambient temperature to avoid thermal expansion error. Clean the bore and gage contact surfaces before each inspection pass to prevent debris from affecting readings. Do not force the gage into a bore; apply only light, consistent hand pressure to avoid damage to the gage or the workpiece surface.