Vermont Gage 111238800 Class Zz Minus Plug Gage 0.3880 in

Product Description

The VERMONT GAGE 111238800 is a Class ZZ Minus plug pin gage ground to a 0.3880-inch nominal diameter. It is used to verify that a machined hole or bore does not exceed its maximum allowable size — a NoGo inspection function in a go/no-go gauging workflow. The gage is machined from steel and finished to a 10 microfinish surface, providing the dimensional stability and surface quality required for repeatable precision measurement. Each unit ships with a Certificate of Accuracy traceable to NIST standards. Overall length is 2 inches. Machinists, quality control technicians, and toolroom personnel are the primary users.

Class ZZ is the most common commercial tolerance grade for plug gages and suits general-purpose inspection of drilled, reamed, or bored holes in production environments. The Minus designation means the gage is ground below the nominal diameter within the Class ZZ tolerance band, making it appropriate for NoGo inspection service. This gage is also suitable for setting micrometers, verniers, and other comparative measuring devices that require a known reference diameter. It is used in both job-shop and production floor quality control applications.

Key Features

• Class ZZ Minus tolerance grade for NoGo inspection service
• 0.3880-inch measurement diameter with 0.0002-inch tolerance
• 10 microfinish surface for consistent, repeatable contact
• Steel construction for dimensional stability and wear resistance
• Certificate of Accuracy with NIST traceability included
• Suitable for setting micrometers, verniers, and other measuring devices

Compatibility

Designed for NoGo inspection of holes and bores at 0.3880-inch nominal diameter. Also suitable as a reference standard for setting micrometers, verniers, and other comparative measuring instruments requiring a calibrated diameter reference.

Installation Notes

Plug pin gages are handled and used by quality control technicians and toolroom machinists. Keep the gage clean and lightly oiled when not in use to prevent corrosion. Never force a plug gage into a hole — apply light, consistent hand pressure only. Store in a protective case away from other tooling to preserve the ground surface finish and dimensional integrity.