Vermont Gage 112118500 Class Zz Plus Plug Gage 18.5mm

Product Description

The VERMONT GAGE 112118500 is a Class ZZ Plus cylindrical plug gage manufactured from tool steel for use in precision dimensional inspection. It is designed to verify bore diameters at a nominal size of 18.5 mm with a tolerance of 0.005 mm, making it suitable for Go inspection applications where tight tolerance confirmation is required. The gage carries a 10 microfinish surface coating and ships with a Certificate of Accuracy traceable to NIST. Machinists, quality technicians, and metrology professionals use this gage as part of incoming inspection routines and process control workflows on the shop floor or in the quality lab.

This plug gage is applied in Go inspection setups where a bore must be confirmed to accept the gage to pass. It is also used to calibrate and set micrometers, verniers, and other measuring devices requiring a known reference diameter. Suitable for both production-line use and toolroom applications, the 112118500 fits standard gage handle systems and is appropriate for medium-precision work governed by ASME B89.1. It is commonly selected by machinists and quality inspectors working with metric bore dimensions in the 18 mm range.

Key Features

• Nominal diameter of 18.5 mm with 0.005 mm tolerance per Class ZZ Plus specification
• Tool steel construction for hardness and dimensional stability under repeated use
• 10 microfinish surface for consistent, low-friction contact during inspection
• Includes Certificate of Accuracy with NIST traceability for audit and calibration documentation
• Conforms to ASME B89.1 standards for plain plug gages
• Overall length of 2.0 inches for compatibility with standard gage handles

Compatibility

Designed as an OEM-style replacement and standard inspection gage for use with metric bore inspection setups requiring an 18.5 mm Go plug gage. Compatible with standard interchangeable gage handle systems sized for this diameter range.

Installation Notes

Plug gages of this type are handled and applied by quality technicians and machinists; no power tools or utility shutoffs are required. Store the gage in its protective case when not in use to prevent surface damage that could affect accuracy. Clean bore surfaces and the gage pin before each use to prevent false rejects or wear. Follow your facility calibration schedule and handle the gage by the handle, not the pin, to avoid thermal expansion errors from hand contact.