Vermont Gage 112101780 Class Zz Plus Plug Gage 1.78mm

Product Description

The VERMONT GAGE 112101780 is a Class ZZ Plus plug gage designed for precise dimensional inspection of small-diameter bores and holes. Manufactured from tool steel with a 10 microfinish surface coating, this gage checks that a feature meets its minimum size requirement in a go inspection application. The nominal diameter is 1.78 mm with a tolerance of 0.005 mm, making it suitable for high-accuracy quality control work. A Certificate of Accuracy with NIST traceability is included, supporting documented inspection programs in production and shop environments. Metrology technicians, quality control inspectors, and precision machinists are the primary users of this instrument.

This plug gage is used wherever a small cylindrical bore must be verified against a minimum acceptable diameter. Typical applications include go inspection of drilled, reamed, or broached holes in manufacturing and machining operations. It is also suitable for setting and verifying micrometers, verniers, and other measuring devices requiring a traceable reference standard. The 1.78 mm diameter makes it appropriate for fine-tolerance work common in precision component manufacturing, instrument assembly, and similar trades requiring dimensional accountability.

Key Features

• 1.78 mm nominal diameter with 0.005 mm tolerance for precise go inspection
• Tool steel construction for durability and dimensional stability
• 10 microfinish surface coating for consistent, repeatable gage contact
• Includes Certificate of Accuracy with NIST traceability for documented QC programs
• Conforms to ASME B89.1 standards
• Compact overall length of 2.0000 inches for easy handling in tight inspection setups

Compatibility

Designed for use as a go inspection gage and as a reference standard for setting micrometers, verniers, and other precision measuring devices requiring a certified dimensional reference at 1.78 mm.

Installation Notes

Plug gages should be handled with clean, dry hands or lint-free gloves to prevent corrosion from skin contact. Store the gage in its protective case when not in use and keep it away from magnetic fields and abrasive surfaces that could alter the finish or diameter. Verify the gage is at thermal equilibrium with the workpiece before inspecting, as temperature differentials can introduce measurement error at this tolerance level. Periodic recalibration against a traceable standard is recommended to maintain measurement integrity over time.