Vermont Gage 912104200 Class Zz Plus Plug Gage 4.2 Mm

Product Description

The VERMONT GAGE 912104200 is a Class ZZ Plus cylindrical plug gage designed for precise go inspection of bored, drilled, or reamed holes. Built from tool steel with a black oxide finish, this gage checks that a hole meets its minimum acceptable size before a part moves to the next stage of production. The gage measures 4.20 mm in diameter and holds a tolerance of 0.00508 mm, making it suitable for quality control work where tight dimensional verification is required. Each unit ships with a Certificate of Accuracy traceable to NIST. Machinists, quality technicians, and tool-room personnel are the primary users.

This plug gage is used in go inspection applications across machine shops, manufacturing lines, and tool rooms. It is sized for 4.20 mm diameter hole verification and is compatible with use alongside micrometers, verniers, and other precision measuring devices for correlating measurements during setup or inspection. The overall length of 2.0000 inches makes it easy to handle in a standard pin-gage handle or chuck style holder. It is well suited for both high-volume production inspection and bench inspection in lower-volume environments.

Key Features

• Class ZZ Plus tolerance of 0.00508 mm for tight dimensional control
• 4.20 mm nominal diameter for go inspection of machined holes
• Tool steel construction for durability and wear resistance
• Black oxide finish reduces surface reflectivity and provides mild corrosion resistance
• Includes Certificate of Accuracy with NIST traceability
• Conforms to ASME B89.1 standards

Compatibility

Designed for use as a go plug gage in conjunction with micrometers, verniers, and other precision measuring devices per standard go inspection practice. Fits standard pin-gage handles sized for small-diameter gages.

Installation Notes

Plug gages are handled and stored by metrology or quality personnel, not installed into systems in the conventional sense. Keep the gage clean and lightly oiled when not in use to prevent corrosion. Do not force the gage into a hole that offers excessive resistance, as this can cause wear or damage to the gage or the workpiece. Store in a protective case away from abrasive materials to maintain calibration integrity.