Vermont Gage 112318550 Class Zz Plus Plug Gage 18.55mm

Product Description

The VERMONT GAGE 112318550 is a Class ZZ Plus cylindrical plug gage with an 18.55 mm diameter, designed for go inspection of machined bores, holes, and precision-fit features. Built from tool steel with a 10 micro finish, it holds a tolerance of 0.00508 mm, meeting ASME B89.1 standards. Each unit ships with a Certificate of Accuracy traceable to NIST. Machinists, quality technicians, and metrology professionals use this gage to verify that a bore meets minimum acceptable size before a part advances in production or ships to the customer.

This plug gage is suited for go inspection tasks in manufacturing, machining, and quality control environments. It works alongside micrometers, verniers, bore gages, and other measuring devices to establish a reference or confirm dimensional conformance. With an overall length of 2.0000 inches, it fits standard handle sets and is practical for both bench inspection and in-process checks on the shop floor. It is a single-diameter gage intended for one specific nominal size — 18.55 mm.

Key Features

• Class ZZ Plus tolerance classification — 0.00508 mm tolerance per ASME B89.1
• Tool steel construction for wear resistance and dimensional stability
• 10 micro surface finish for consistent, repeatable contact
• NIST-traceable Certificate of Accuracy included with each unit
• Overall length of 2.0000 inches — compatible with standard plug gage handles
• Go inspection configuration for verifying minimum bore acceptance

Compatibility

Designed for use as a go plug gage in applications requiring bore inspection, and for use with micrometers, verniers, and other precision measuring devices per manufacturer specifications.

Installation Notes

Plug gages are handled and used by quality technicians and machinists — not installed in a system. Clean the gage and bore thoroughly before use to prevent false readings caused by chips or coolant residue. Never force the gage into a bore; go gages should enter under their own weight or with light hand pressure only. Store the gage in its case away from heat sources and magnetic fields to preserve dimensional accuracy.