Vermont Gage 112318750 Class Zz Plus Plug Gage 18.75 Mm

Product Description

The VERMONT GAGE 112318750 is a Class ZZ Plus plug gage designed for precision dimensional inspection in machine shops, quality labs, and manufacturing environments. Built from tool steel with a 10 micro finish, it checks bore diameters at 18.75 mm with a tolerance of 0.005 mm (0.00508 mm actual). The gage measures 2.0000 inches in overall length and ships with a Certificate of Accuracy traceable to NIST standards. This is a go-inspection gage intended for use alongside micrometers, verniers, and other precision measuring devices. Machinists, QC inspectors, and calibration technicians are the primary users.

This plug gage is suited for go-inspection applications in production and inspection environments where tight bore tolerances must be verified. It is commonly used with set micrometers, verniers, and similar measuring instruments to confirm that a bored hole meets minimum size requirements. The Class ZZ Plus designation indicates compliance with ASME B89.1 standards, making it appropriate for both shop-floor inspection and calibration lab use in light to medium manufacturing settings.

Key Features

• 18.75 mm inspection diameter with 0.005 mm Class ZZ Plus tolerance
• Tool steel construction with 10 micro surface finish for consistent contact and wear resistance
• Meets ASME B89.1 dimensional gage standards
• Includes Certificate of Accuracy with NIST traceability
• Go-inspection configuration for verifying minimum bore size compliance
• Compact 2.0000-inch overall length for easy handling in tight inspection setups

Compatibility

Designed for use with set micrometers, verniers, and other precision measuring devices requiring a Class ZZ Plus go plug gage at 18.75 mm diameter per ASME B89.1.

Installation Notes

Plug gages should be handled and stored with care to prevent nicks, corrosion, or thermal distortion that could affect accuracy. Allow the gage and workpiece to reach the same ambient temperature before inspection, as thermal variation can produce false readings at tight tolerances. Do not force the gage into a bore; apply light, consistent hand pressure only. Calibration and re-certification should be performed at intervals consistent with your facility quality plan and applicable ASME standards.