Vermont Gage 112304770 Class Zz Plus Plug Gage 4.77mm

Product Description

The VERMONT GAGE 112304770 is a Class ZZ Plus plug gage designed for precision bore and hole inspection in tool rooms, quality labs, and production environments. Machined from tool steel with a 10 microfinish surface, this gage measures a nominal diameter of 4.77 mm with a tolerance of 0.005 mm, meeting the requirements of ASME B89.1. Each unit ships with a Certificate of Accuracy that includes NIST traceability, confirming the measurement is backed by a documented calibration chain. It is sized for use with go inspection procedures and is compatible with setting micrometers, verniers, and other precision measuring devices.

This plug gage is suited for machine shops, quality control departments, and metrology labs that require repeatable, certified dimensional verification of small-diameter bores. Typical applications include go-gage inspection of drilled, reamed, or bored holes in the 4.77 mm range. The NIST-traceable certificate supports audit and ISO quality system documentation requirements. Licensed metrology technicians, toolmakers, and QC inspectors are the primary users of this gage in both production and inspection settings.

Key Features

• 4.77 mm nominal diameter with 0.005 mm tolerance for tight Class ZZ Plus accuracy
• Tool steel construction for wear resistance and dimensional stability
• 10 microfinish surface for consistent, low-friction bore contact
• Meets ASME B89.1 dimensional gage standards
• Includes Certificate of Accuracy with NIST traceability for quality system compliance
• Suitable for go inspection, setting micrometers, and vernier calibration use

Compatibility

Designed for go inspection of 4.77 mm diameter bores and for setting micrometers, verniers, and other precision measuring devices per ASME B89.1 requirements.

Installation Notes

Plug gages are handled and stored by metrology technicians and toolmakers following standard gage care procedures. Before use, clean the gage and bore contact surfaces to remove chips, oil, and debris that can cause false readings or premature wear. Do not force the gage through a bore; light, controlled insertion is required to avoid damaging the gage or the part. Store in a protective case away from heat sources to maintain dimensional stability.