Vermont Gage 112121660 Class Zz Plus Plug Gage 21.66mm

Product Description

The VERMONT GAGE 112121660 is a Class ZZ Plus plug gage designed for go inspection of bored, reamed, or otherwise machined holes with a nominal diameter of 21.66 mm. Manufactured from tool steel with a 10 micro finish, this gage provides a tolerance of 0.00508 mm, meeting the dimensional verification requirements set out in ASME B89.1. Each unit ships with a Certificate of Accuracy that carries full NIST traceability, making it suitable for quality-controlled production environments. The overall length is 2.0000 inches. Machinists, quality technicians, and metrology professionals use this gage as part of incoming inspection, process control, and final acceptance routines.

This plug gage is used in manufacturing and inspection settings where hole size must be confirmed to tight tolerances before parts proceed to the next stage of production. It is appropriate for go inspection operations alongside set micrometers, verniers, and other precision measuring devices. The 21.66 mm diameter corresponds to a specific bore size common in machined components, and the Class ZZ Plus classification indicates it falls within the tighter end of the ZZ tolerance band. Installation environments include machine shops, quality labs, and production floors in both industrial and aerospace-adjacent applications.

Key Features

• 21.66 mm nominal diameter with 0.00508 mm tolerance for precise go inspection
• Tool steel construction provides durability in repetitive gage use
• 10 micro surface finish on the gage surface for consistent contact measurement
• Includes Certificate of Accuracy with NIST traceability for documentation compliance
• Conforms to ASME B89.1 standards for plain plug gages
• Overall length of 2.0000 inches suits standard gage handle configurations

Compatibility

Designed as an OEM-style go plug gage for use with standard gage handle assemblies and compatible with inspection routines calling for ASME B89.1 Class ZZ Plus tooling at 21.66 mm diameter.

Installation Notes

Plug gages of this type are handled and used by quality technicians and machinists; no power source is required. Clean the gage and the part bore thoroughly before use to prevent false readings from contamination or burrs. Store in a protective case away from temperature extremes to maintain dimensional stability. Do not force the gage through a bore; if resistance is encountered, the hole is undersized and should be re-inspected with appropriate measuring equipment.