Vermont Gage 112304750 Class Zz Plus Plug Gage 4.75mm

Product Description

The VERMONT GAGE 112304750 is a Class ZZ Plus cylindrical plug gage machined from tool steel for dimensional inspection of bore diameters. Designed for go-inspection work, this gage checks that a hole meets its minimum acceptable size before a part moves forward in the production or quality process. It carries a tolerance of 0.00508 mm and a 10 microfinish surface finish, giving metrology and QC technicians a reliable, calibration-grade reference. A Certificate of Accuracy with NIST traceability is included, satisfying most shop-floor and ISO audit documentation requirements. The overall length is 2.0 inches, keeping it manageable in tight inspection setups.

This plug gage is suited for use in machine shops, manufacturing facilities, and precision assembly environments where bore diameters must be verified against tight tolerances. It is compatible with go-inspection routines and can also be used to set micrometers, verniers, and other measuring devices requiring a known reference diameter. At 4.75 mm, it covers a bore size common in small mechanical assemblies, hydraulic fittings, and precision machined components. Quality control technicians, machinists, and metrologists are the primary users.

Key Features

• Class ZZ Plus tolerance rating of 0.00508 mm for high-accuracy go-inspection
• Tool steel construction for wear resistance and dimensional stability
• 10 microfinish surface finish for consistent, repeatable contact measurement
• Overall length of 2.0 inches for practical handling in bench and inline inspection
• Includes Certificate of Accuracy with NIST traceability for audit and calibration records
• Conforms to ASME B89.1 standards

Compatibility

Designed for go-inspection of 4.75 mm diameter bores and for setting micrometers, verniers, and other measuring devices requiring a calibrated reference standard.

Installation Notes

Plug gages are handled and used by quality control technicians and machinists; no permanent installation is required. Keep the gage clean and lightly oiled when not in use to prevent corrosion and maintain surface finish integrity. Do not force the gage into a bore — go gages should enter under their own weight or with minimal hand pressure. Store in the provided case and recalibrate on a schedule consistent with ASME B89.1 and your facility quality plan.