Vermont Gage 111131000 Class Zz Plus Plug Gage 0.31 in

Product Description

The VERMONT GAGE 111131000 is a Class ZZ Plus plug gage designed for precision go inspection of bored, drilled, and reamed holes. Built from tool steel with a 10 microfinish surface, this gage provides a measurement diameter of 0.31 inches and holds a tolerance of 0.0002 inches. It ships with a Certificate of Accuracy traceable to NIST, confirming it meets ASME B89.1 standards. Machinists, quality control technicians, and toolroom personnel use this gage to verify hole diameter acceptance during in-process and final inspection. Its compact form factor suits bench inspection stations and field-side use.

This plug gage is suited for go inspection applications in manufacturing, machining, and precision assembly environments. It is also used to set and verify micrometers, verniers, and other measuring devices where a known reference diameter is required. The 0.31-inch diameter and 2.0-inch overall length make it a practical choice for small-bore inspection work in both job shop and production settings. A single unit is packaged per order.

Key Features

• Measurement diameter of 0.31 inches with a tolerance of 0.0002 inches
• Class ZZ Plus classification meeting ASME B89.1 standards
• 10 microfinish surface for accurate, repeatable contact
• Tool steel construction for wear resistance and dimensional stability
• Includes Certificate of Accuracy with NIST traceability
• Suitable for setting micrometers, verniers, and other measuring instruments

Compatibility

Designed for go inspection of holes at 0.31 inches nominal diameter; also used as a reference standard to calibrate and set micrometers, verniers, and comparable hand-measuring devices.

Installation Notes

Plug gages should be handled and stored by qualified inspection or toolroom personnel. Clean the gage and workpiece bore before use to prevent debris from affecting readings or damaging the gage surface. Do not force the gage through an undersized hole, as this will cause wear and dimensional deviation. Store in the provided case or a protected location away from moisture to maintain calibration integrity.