Vermont Gage 112321290 Class Zz Plus Plug Gage 21.29mm

Product Description

The VERMONT GAGE 112321290 is a Class ZZ Plus plug gage used to verify bore diameters and hole tolerances in precision machining and inspection environments. It is manufactured from tool steel with a 10 micro finish and holds a tolerance of 0.00508 mm, making it suitable for Go inspection applications where tight dimensional control is required. At 2.0000 inches in overall length and a nominal diameter of 21.29 mm, this gage is a standard tool for quality control technicians, machinists, and metrology professionals verifying production parts. Each unit ships with a Certificate of Accuracy traceable to NIST, supporting documentation requirements in regulated manufacturing environments. Conformance is in accordance with ASME B89.1.

This plug gage is used in dimensional inspection of machined bores, drilled holes, and precision-fit assemblies. It functions as a Go gage for checking that a hole meets its minimum acceptance diameter. Typical applications include setting and verifying micrometers, verniers, and other measuring devices, as well as direct Go inspection of workpieces on the shop floor or in a metrology lab. It is appropriate for use in both production inspection and tool calibration workflows across manufacturing, aerospace, automotive, and general machining industries.

Key Features

• Class ZZ Plus tolerance grade at 0.00508 mm for high-accuracy Go inspection
• Tool steel construction for durability and dimensional stability
• 10 micro surface finish for consistent, repeatable contact
• NIST-traceable Certificate of Accuracy included with each unit
• Meets ASME B89.1 dimensional gage standards
• Compatible with use as a reference standard for micrometers, verniers, and similar measuring devices

Compatibility

Designed for Go inspection use with micrometers, verniers, and other precision measuring devices requiring a 21.29 mm diameter reference standard.

Installation Notes

Plug gages are handled and used by quality technicians and machinists trained in precision measurement practices. Clean the gage and the workpiece bore thoroughly before use to prevent contamination from affecting readings. Store the gage in its protective case when not in use to preserve surface finish and dimensional integrity. Do not force the gage into an undersized bore, as this can damage the gage surface and produce inaccurate inspection results.