Vermont Gage 112118340 Class Zz Plus Plug Gage 18.34mm

Product Description

The VERMONT GAGE 112118340 is a Class ZZ Plus cylindrical plug gage used for go inspection of bored, drilled, or reamed holes with an 18.34 mm nominal diameter. Manufactured from tool steel with a 10 micro-inch finish, it holds a tolerance of 0.00508 mm, meeting the precision requirements of ASME B89.1. Each gage ships with a Certificate of Accuracy traceable to NIST. Machinists, quality control technicians, and metrologists use this gage to confirm that a hole is within its lower acceptance limit before a part advances in production or is released for assembly.

This plug gage is suited for use in machine shops, manufacturing facilities, and inspection labs where hole diameter verification is required. It works alongside set micrometers, verniers, and other measuring devices to calibrate and cross-check instruments. The go design confirms the minimum acceptable hole size, making it a standard tool in first-article inspection, in-process checks, and final dimensional verification of metallic and non-metallic workpieces requiring an 18.34 mm bore.

Key Features

• Class ZZ Plus tolerance class per ASME B89.1 for go inspection applications
• 18.34 mm nominal diameter with 0.00508 mm tolerance
• Tool steel construction with 10 micro-inch surface finish for wear resistance and dimensional stability
• Overall length of 2.0000 inches for standard handle compatibility
• Includes Certificate of Accuracy with NIST traceability for calibration records
• Compatible with set micrometers, verniers, and other precision measuring devices

Compatibility

Designed for go inspection of 18.34 mm diameter holes and for setting or verifying micrometers, verniers, and other measuring instruments requiring a precision reference of that diameter.

Installation Notes

Handle and store plug gages in a clean, temperature-stable environment to prevent thermal expansion errors during measurement. Before use, clean the gage and the workpiece bore with a lint-free cloth to remove chips, oil, and debris that could affect readings or damage the gage surface. Apply light, consistent hand pressure when inserting the gage — never force it through a bore. Return the gage to its protective case after each use and re-verify against calibration standards at intervals appropriate to your quality management system.