Vermont Gage 111187900 Class Zz Plus Plug Gage 0.879 in

Product Description

The VERMONT GAGE 111187900 is a Class ZZ Plus plug gage designed for precision dimensional inspection. Machined from tool steel with a 10 microfinish surface, it measures a nominal diameter of 0.879 inches with a tolerance of 0.0002 inches. The overall length is 2.0 inches. This gage is used to verify bore sizes against a Go limit, confirming that a hole is within the specified minimum acceptable diameter. Each unit ships with a Certificate of Accuracy traceable to NIST, making it suitable for quality-controlled environments. Dimensional inspection technicians, machinists, and metrology personnel are the primary users.

This plug gage is applied in Go inspection routines for checking bored, drilled, or reamed holes in manufactured components. It is also used to calibrate or verify the accuracy of set micrometers, vernier calipers, and other measuring devices. Class ZZ Plus gages are commonly found in production inspection, incoming quality control, and tool room environments where ASME B89.1 standards govern the gage tolerance class. The compact 2.0-inch overall length suits bench-top inspection stations and portable gage kits.

Key Features

• Class ZZ Plus tolerance class per ASME B89.1 standard
• 0.879 inches nominal measurement diameter with 0.0002-inch tolerance
• 10 microfinish surface for accurate, repeatable contact
• Tool steel construction for hardness and wear resistance
• Includes Certificate of Accuracy with NIST traceability
• Compatible with Go inspection, set micrometer calibration, and vernier verification

Compatibility

Designed for Go inspection of bores nominally sized at 0.879 inches, and for use as a reference standard when setting micrometers, verniers, and other measuring devices. Conforms to ASME B89.1 Class ZZ Plus gage tolerances.

Installation Notes

Plug gages require no power source and are handled manually by inspection or metrology personnel. Keep the gage clean and lightly oiled when not in use to prevent corrosion of the tool steel body. Never force the gage into a bore; if resistance is felt, the hole is undersized and the gage should be withdrawn without applying lateral load. Store in the provided case or a clean, dry location away from surfaces that could cause impact damage or wear to the precision-ground diameter.