Vermont Gage 112312150 Class Zz Plus Plug Gage 12.15mm

Product Description

The VERMONT GAGE 112312150 is a Class ZZ Plus plug gage machined from tool steel for dimensional go inspection of bored, reamed, and drilled holes. It measures a nominal diameter of 12.15 mm with a tolerance of 0.005 mm (0.00508 mm), making it suitable for precision quality-control work on the shop floor or in the inspection lab. The working surface carries a 10 microfinish, which limits wear and supports consistent gage readings over repeated use. Each unit ships with a Certificate of Accuracy that includes NIST traceability, satisfying documentation requirements for ISO and AS quality systems. Machinists, quality technicians, and tool-room personnel are the primary users of this gage.

This plug gage is used in go inspection routines to verify that a hole or bore accepts the nominal diameter within tolerance. It is well-suited for production inspection of machined parts in residential, commercial, and industrial manufacturing environments. The 2.0-inch overall length provides a practical handle for single-hand operation at a machine or inspection station. In addition to go inspection, the gage serves as a reference setting standard for micrometers, verniers, and other measuring devices that require a known diameter for calibration or zeroing. Manufactured to ASME B89.1 standards.

Key Features

• 12.15 mm nominal diameter with 0.005 mm Class ZZ Plus tolerance
• Tool steel construction for wear resistance and dimensional stability
• 10 microfinish surface for consistent contact and reduced gage wear
• Certificate of Accuracy with NIST traceability included
• Manufactured to ASME B89.1 standards
• 2.0-inch overall length for comfortable single-hand use

Compatibility

Designed for use as a go plug gage in standard dimensional inspection of holes and bores, and as a setting reference for micrometers, verniers, and other measuring devices requiring a 12.15 mm reference diameter.

Installation Notes

Plug gages should be handled with clean, dry gloves or a cloth to prevent corrosion from skin oils, which can affect accuracy over time. Store the gage in its protective case when not in use and allow it to reach ambient temperature before performing inspection to avoid thermal expansion errors. Do not force the gage into a hole; proper go inspection involves gentle insertion with light axial pressure only. Periodic recalibration against NIST-traceable standards is recommended to maintain measurement integrity.