Vermont Gage 112218340 Class Zz Minus Plug Pin Gage 18.34mm

Product Description

The VERMONT GAGE 112218340 is a Class ZZ Minus plug pin gage machined to a diameter of 18.34 mm with a tolerance of 0.00508 mm. It is used to verify that a bored or reamed hole does not exceed its maximum allowable size, functioning as the NoGo member in a go/no-go inspection pair. The gage is manufactured from steel and includes a Certificate of Accuracy with NIST traceability, making it suitable for calibrated inspection environments. Overall length is 2 inches. It is installed and used by quality control technicians, machinists, and tool-room personnel performing dimensional inspection on production parts.

This plug pin gage is applied in NoGo hole inspection routines where confirming maximum material condition is required. It is also used to set and verify micrometers, verniers, and other measuring devices requiring a traceable reference standard. Typical applications include inspection of machined bores in manufacturing, job shop, and quality lab environments where close-tolerance hole verification is part of the process. The Class ZZ designation indicates a commercial-grade tolerance class appropriate for general production inspection rather than master or working reference standards.

Key Features

• Class ZZ Minus tolerance class for NoGo hole inspection
• 18.34 mm measurement diameter with 0.00508 mm tolerance
• Steel construction for wear resistance and dimensional stability
• Certificate of Accuracy with NIST traceability included
• Compatible with setting micrometers, verniers, and other measuring devices
• 2-inch overall length for standard hand-held use

Compatibility

Designed for NoGo inspection of holes at 18.34 mm diameter and for setting micrometers, verniers, and other measuring devices requiring a traceable reference at this diameter.

Installation Notes

Plug pin gages are used by hand and do not require tools for operation, but they should be handled with clean, dry gloves or a gage holding fixture to prevent corrosion from skin contact. Store the gage in its case when not in use and keep it away from magnetic fields and abrasive surfaces. Re-calibrate periodically according to your quality management system requirements, using the included NIST-traceable certificate as the baseline reference.