Vermont Gage 112218780 Class Zz Minus Plug Pin Gage 18.78mm

Product Description

The VERMONT GAGE 112218780 is a Class ZZ Minus plug pin gage machined from steel and used to verify bore and hole dimensions during precision inspection work. It measures 18.78 mm in diameter with a tolerance of 0.00508 mm, making it suited for tight-tolerance NoGo inspection tasks. Overall length is 2 inches. Each gage ships with a Certificate of Accuracy that includes NIST traceability, confirming the measurement standard against which the gage was verified. Machinists, quality technicians, and tool-room professionals use this type of gage as part of go/nogo inspection routines to confirm that a feature does not exceed its maximum allowable size.

This plug pin gage is designed for NoGo inspection applications and is also compatible with use alongside set micrometers, verniers, and other measuring devices requiring a calibrated reference standard. It is appropriate for both production-floor and quality-lab environments where dimensional verification of bored holes, drilled passages, or machined features is required. The Class ZZ designation indicates a commercial-grade tolerance class suitable for general inspection work in manufacturing, maintenance, and metrology settings.

Key Features

• 18.78 mm measurement diameter with 0.00508 mm tolerance for precise NoGo inspection
• Class ZZ Minus tolerance class - commercial grade for general dimensional inspection
• Steel construction for durability and dimensional stability
• 10 micro coating finish to protect against corrosion and wear
• Includes Certificate of Accuracy with NIST traceability for documentation and calibration records
• 2-inch overall length for standard handheld use

Compatibility

Designed for use in NoGo inspection routines and as a reference standard for setting micrometers, verniers, and other precision measuring devices. Compatible with standard plug gage handles and fixtures sized for the 18.78 mm diameter range.

Installation Notes

Plug pin gages are handled and used by quality technicians and machinists - no installation in the mechanical sense is required. Store the gage in its protective case when not in use and avoid contact with abrasive surfaces that could alter the gage diameter. Clean the gage and the part bore before use to prevent debris from affecting readings. Periodic recalibration against a traceable standard is recommended to maintain measurement integrity.