Vermont Gage 112421010 Class Zz Minus Plug Pin Gage 21.01mm

Product Description

The VERMONT GAGE 112421010 is a Class ZZ minus plug pin gage machined from steel and used to perform NoGo inspection on bored, reamed, or drilled holes. It checks that a hole has not been made oversized, confirming that the workpiece falls within the acceptable rejection threshold. The gage measures a nominal diameter of 21.01 mm with a tolerance of 0.00508 mm, making it suited for precision metrology applications where tight dimensional control is required. Each unit ships with a Certificate of Accuracy traceable to NIST standards. Overall length is 2 inches. Machinists, toolroom technicians, and quality control inspectors are the primary users.

This pin gage is applied in manufacturing and inspection environments where hole diameter must be verified against a NoGo limit. It is also used to set and verify micrometers, verniers, and other measuring devices requiring a known reference diameter. Typical settings include machine shops, toolrooms, and QC labs handling precision-machined components. The Class ZZ designation indicates this is a commercial-grade gage appropriate for general production inspection rather than master or reference-grade work.

Key Features

• Class ZZ minus tolerance - designed for NoGo inspection of hole diameters
• 21.01 mm nominal measurement diameter with 0.00508 mm tolerance
• Steel construction for durability and dimensional stability
• Overall length of 2 inches for comfortable single-hand use
• Includes Certificate of Accuracy with NIST traceability
• Compatible with use as a setting reference for micrometers, verniers, and other measuring devices

Compatibility

Designed for use in NoGo hole inspection applications and as a setting reference for micrometers, verniers, and other measuring devices requiring a calibrated diameter standard.

Installation Notes

Plug pin gages are handled and applied by machinists, metrology technicians, and quality control inspectors - no special tools are required for use. Store the gage in its protective case when not in use to prevent surface damage or contamination that could affect dimensional accuracy. Clean the gage and the workpiece hole before each measurement to remove chips, oil, or debris. Never force the gage into a hole; if resistance is felt, the hole condition or diameter should be re-evaluated before proceeding.