Vermont Gage 111178900 Class Zz Plus Plug Gage 0.789 in

Product Description

The VERMONT GAGE 111178900 is a Class ZZ Plus plug gage designed for precision bore and hole inspection in manufacturing and quality control environments. Machined from tool steel, this plug gage measures a nominal diameter of 0.789 inches with a tight tolerance of 0.0002 inches and a surface finish of 10 microinch. It ships with a Certificate of Accuracy that carries NIST traceability, meeting the documentation requirements of most quality management systems. Machinists, tool and die makers, and quality control technicians use this gage to confirm that drilled, reamed, or bored features fall within specification before parts advance through production.

This plug gage is suited for go inspection applications in both job shop and production floor settings. It is also commonly used as a reference standard when setting micrometers, vernier calipers, and other comparative measuring devices to a known diameter. The 0.789-inch size covers a range of common mechanical bore and hole specifications found in general machining, fixture building, and component manufacturing work. Its compact overall length of 2.0 inches makes it easy to handle in confined inspection setups.

Key Features

• Class ZZ Plus tolerance class — 0.0002 inches — for reliable go inspection of bored and drilled features
• 10 microinch surface finish supports accurate, repeatable contact measurements
• Tool steel construction for hardness and wear resistance in production environments
• Includes Certificate of Accuracy with NIST traceability for quality documentation compliance
• Conforms to ASME B89.1 standards for plain plug gages
• Compact 2.0-inch overall length for ease of use in tight inspection setups

Compatibility

Designed for go inspection of holes and bores with a nominal diameter of 0.789 inches. Also suitable for use as a setting reference with micrometers, vernier calipers, and other measuring devices requiring a calibrated reference standard at this diameter.

Installation Notes

Plug gages are handled and used by quality technicians and machinists — no power tools or utility shutoffs are required. Keep the gage clean and lightly oiled when not in use to prevent corrosion and maintain surface finish integrity. Do not force the gage into a bore; excessive insertion force can damage both the gage and the workpiece and will produce an invalid inspection result. Store in the provided case or a protected location away from other tooling to prevent nicking the gage surface.