Vermont Gage 112304550 Class Zz Plus Plug Gage 4.55 Mm

Product Description

The VERMONT GAGE 112304550 is a Class ZZ Plus plug gage machined from tool steel for dimensional inspection of bored and reamed holes. It measures hole diameters at a nominal 4.55 mm with a tolerance of 0.00508 mm, giving inspectors and machinists a reliable go-condition reference. The ground and lapped gaging surface carries a 10 microfinish rating, which ensures repeatable, low-friction contact with the workpiece bore. Each unit ships with a Certificate of Accuracy traceable to NIST, satisfying documentation requirements in quality-controlled shops and manufacturing environments. Licensed metrology technicians, toolroom machinists, and quality inspectors are the primary users of this gage.

This plug gage is suited for incoming inspection, in-process verification, and final acceptance of precision bores in residential and commercial manufacturing settings. Typical applications include checking drilled, reamed, or bored holes during machining operations, and setting or verifying micrometers, verniers, and other measuring devices to a known reference diameter. The 2.0000-inch overall length fits standard handle holders. It is appropriate for any shop or inspection department working to ASME B89.1 dimensional standards.

Key Features

• Class ZZ Plus tolerance of 0.00508 mm for precision go-condition inspection
• 10 microfinish ground surface for consistent, low-wear contact
• Tool steel construction for hardness and long service life
• Includes Certificate of Accuracy with NIST traceability
• Conforms to ASME B89.1 dimensional gaging standards
• Overall length of 2.0000 inches fits standard plug gage handles

Compatibility

Designed as a go-inspection plug gage for use with standard gage handle holders and compatible with micrometers, verniers, and other measuring devices requiring a 4.55 mm reference standard.

Installation Notes

Plug gages are handled and used by metrology technicians and quality inspectors rather than installed in the traditional sense. Before use, clean the gage and the workpiece bore with a lint-free cloth to remove chips, oil, and debris that could affect the reading. Apply light gage oil to the gaging surface to reduce wear during insertion. Store the gage in its protective case when not in use to prevent nicks or corrosion that would invalidate the NIST-traceable calibration.