Vermont Gage 112103980 Class Zz Plus Plug Gage 3.98mm

Product Description

The VERMONT GAGE 112103980 is a Class ZZ Plus plug gage designed for dimensional inspection of bored and drilled holes. It measures 3.98 mm in diameter with a tolerance of 0.005 mm, making it suited for precision go-inspection applications where tight dimensional control is required. The gage is machined from tool steel and features a 10 microfinish surface, delivering consistent, repeatable contact across measurement cycles. At 2.0 inches overall length, it fits standard handle setups used in shop and inspection environments. Each unit ships with a Certificate of Accuracy traceable to NIST, supporting documentation requirements for quality management systems. Licensed metrologists, quality technicians, and tool room machinists are the primary users.

This plug gage is used in go-inspection routines to verify that a drilled or bored hole meets its minimum allowable diameter. It is also compatible with setup and calibration tasks for micrometers, verniers, and other measuring devices. Applications span precision machining shops, manufacturing quality control departments, and inspection labs where ASME B89.1 compliance is required. The 3.98 mm size targets metric hole specifications common in light mechanical assemblies, instrument components, and close-tolerance manufactured parts.

Key Features

• 3.98 mm diameter with 0.005 mm tolerance for precise go-inspection
• 10 microfinish surface for consistent, low-friction gauge contact
• Tool steel construction for wear resistance and dimensional stability
• 2.0 inches overall length, compatible with standard plug gage handles
• Includes Certificate of Accuracy with NIST traceability
• Conforms to ASME B89.1 dimensional standards

Compatibility

Designed for use as a go-inspection plug gage in standard gage handle setups and as a reference standard for setting micrometers, verniers, and other measuring devices per ASME B89.1 requirements.

Installation Notes

Plug gages should be handled with clean, dry hands or lint-free gloves to prevent corrosion from skin oils. Store the gage in its case when not in use and allow it to reach ambient temperature before measurement to avoid thermal expansion errors. Do not force the gage through a hole; go gages should pass under their own weight or with light hand pressure only. Periodic recalibration against NIST-traceable standards is recommended to maintain measurement integrity.