Vermont Gage 112320470 Class Zz Plus Plug Gage 20.47mm

Product Description

The VERMONT GAGE 112320470 is a Class ZZ Plus plug gage with a 20.47 mm nominal diameter, designed for dimensional inspection of bored holes, machined bores, and precision-toleranced features. Built from tool steel with a 10 micro finish, it holds a tolerance of 0.00508 mm, meeting the requirements of ASME B89.1. Each unit ships with a Certificate of Accuracy that carries NIST traceability, making it suitable for use in calibrated inspection environments. Machinists, quality technicians, and metrology professionals use this gage to verify Go-side conformance quickly and reliably in production or inspection lab settings.

This plug gage is used for Go inspection of holes and bores where tight dimensional control is required. It is appropriate for verifying fit in both production floor inspection and bench-level metrology workflows. Typical applications include setting and checking micrometers, verniers, and other measuring devices to a known reference diameter. The 20.47 mm size fits common metric bore dimensions found in precision mechanical assemblies, tooling fixtures, and machined components across manufacturing environments.

Key Features

• Class ZZ Plus tolerance grade: 0.00508 mm, conforming to ASME B89.1
• Tool steel construction for hardness and wear resistance in repeated inspection use
• 10 micro surface finish for consistent, low-friction gage contact
• Includes Certificate of Accuracy with NIST traceability for calibrated inspection records
• Suitable for Go inspection, micrometer setting, vernier calibration, and similar measuring device reference use
• Overall length of 2.0000 inches for standard handle compatibility

Compatibility

Designed for use as a Go-side inspection reference gage in applications requiring a 20.47 mm nominal bore diameter. Compatible with standard plug gage handles and suitable for use with micrometers, verniers, and other measuring devices per the manufacturer application specification.

Installation Notes

Plug gages should be handled with clean, dry hands or cotton gloves to prevent corrosion from skin oils. Store the gage in its case when not in use and allow it to reach ambient temperature before performing inspection to avoid thermal expansion errors. Do not force the gage into a bore; controlled, smooth insertion is required to protect both the gage and the workpiece. Periodic recalibration against a traceable standard is recommended to maintain inspection integrity.