Vermont Gage 112118540 Class Zz Plus Plug Gage 18.54mm

Product Description

The VERMONT GAGE 112118540 is a Class ZZ Plus plug gage designed for go inspection of precision bored holes and machined features. Manufactured from tool steel with a 10 micro finish, this plug gage measures 18.54 mm in diameter and carries a tolerance of 0.00508 mm (0.005 mm), placing it in the tighter ZZ Plus classification. The overall length is 2.0000 inches, making it compatible with standard handle sets used in production and quality control environments. Each unit ships with a Certificate of Accuracy traceable to NIST, meeting the documentation requirements for ISO and AS9100 quality systems. Machinists, quality technicians, and metrologists use this gage on the shop floor and in inspection rooms.

This plug gage is used in applications where go inspection of holes and bores is required to verify that a machined feature is within the minimum material condition limit. It is also suited for setting and calibrating micrometers, verniers, and other measuring devices. Typical use environments include precision machining shops, aerospace and defense manufacturing, and any production setting requiring verification to ASME B89.1 standards. It is most often handled by quality control technicians and skilled machinists during in-process or final inspection.

Key Features

• Class ZZ Plus tolerance of 0.00508 mm for tight-tolerance go inspection
• 18.54 mm diameter with 2.0000-inch overall length for standard handle compatibility
• Tool steel construction with 10 micro surface finish for durability and wear resistance
• Includes Certificate of Accuracy with NIST traceability for audit-ready documentation
• Conforms to ASME B89.1 standard for plain plug gages
• Suitable for setting micrometers, verniers, and other measuring devices in addition to go inspection

Compatibility

Designed for use with standard plug gage handles sized for 18.54 mm diameter gage members. Also suitable for use as a reference standard when setting micrometers, verniers, and other precision measuring devices requiring a traceable reference of this diameter.

Installation Notes

Plug gages should be handled with clean, dry hands or cotton gloves to prevent corrosion from skin oils. Before use, verify that the gage and workpiece are at the same ambient temperature to avoid thermal expansion errors, particularly in close-tolerance applications. Do not force the gage member into a hole; apply only light, consistent hand pressure in line with the bore axis. Store the gage in its protective case when not in use to preserve the lapped surface finish and dimensional integrity.