Vermont Gage 112320390 Class Zz Plus Plug Gage 20.39mm

Product Description

The VERMONT GAGE 112320390 is a Class ZZ Plus plug gage designed for precise dimensional inspection of bored holes and machined features at a nominal diameter of 20.39 mm. Built from tool steel with a 10 microfinish surface coating, this gage delivers a tolerance of 0.00508 mm, making it appropriate for Go inspection tasks where consistent, reliable measurement is required. Each unit ships with a Certificate of Accuracy traceable to NIST, confirming conformance to ASME B89.1 standards. Machinists, quality control technicians, and tool-room professionals use this gage as part of a standard go/no-go inspection process or to set and verify micrometers, verniers, and other precision measuring devices.

This plug gage is suited for shop-floor and laboratory inspection environments where tight bore tolerances must be verified quickly and repeatedly. It is appropriate for use in manufacturing, aerospace, automotive, and general machining applications where ASME B89.1 compliance is required. The 20.39 mm diameter and 2.0000 inch overall length make it a practical fit for benchtop inspection stations and incoming quality control workflows. It is also used to calibrate and verify the accuracy of measuring instruments including micrometers and vernier calipers.

Key Features

• 20.39 mm nominal diameter with 0.00508 mm tolerance for precise Go inspection
• Class ZZ Plus designation meets ASME B89.1 dimensional standards
• Tool steel construction with 10 microfinish surface for durability and accuracy
• Includes Certificate of Accuracy with NIST traceability
• 2.0000 inch overall length suitable for standard plug gage handles and fixtures
• Compatible with setting micrometers, verniers, and other precision measuring devices

Compatibility

Designed for Go inspection use with micrometers, verniers, and other precision measuring devices. Suitable for any application requiring ASME B89.1 compliant Class ZZ Plus plug gage inspection at a 20.39 mm diameter.

Installation Notes

Plug gages should be handled by quality control technicians or trained machinists familiar with precision measurement practices. Keep the gage clean and lightly oiled when not in use to prevent corrosion of the tool steel surface. Do not force the gage into a bore; apply only light, consistent hand pressure to avoid wear or damage to the gage or workpiece. Store in a protective case away from temperature extremes to maintain dimensional stability and NIST-traceable accuracy.