Vermont Gage 112403890 Class Zz Minus Plug Pin Gage 3.89mm

Product Description

The VERMONT GAGE 112403890 is a Class ZZ minus plug pin gage sized at 3.89 mm diameter with a tolerance of 0.00508 mm. It is used to perform NoGo inspection on bored holes, reamed features, and other precision openings where conformance to a lower dimensional limit must be verified. The gage body is machined from steel with a 10 microfinish surface coating that resists wear and maintains measurement integrity over repeated use. Each unit ships with a Certificate of Accuracy traceable to NIST, supporting quality documentation requirements in manufacturing and inspection environments. Machinists, quality technicians, and tool-and-die professionals are the primary users of this type of gage.

This pin gage is suited for dimensional inspection in precision machining shops, toolrooms, and quality control labs. It is used with setting micrometers, vernier calipers, and other measuring devices to verify that a feature does not exceed the minimum acceptable size. The minus designation indicates the gage is ground to the lower boundary of the Class ZZ tolerance band, making it appropriate for NoGo functional checks. Overall gage length is 2 inches, which accommodates standard handle and chuck systems used in bench inspection setups.

Key Features

• Class ZZ minus tolerance ground to 0.00508 mm for NoGo inspection applications
• 3.89 mm measurement diameter with 10 microfinish surface coating for repeatable contact
• Steel construction provides durability across high-cycle inspection use
• 2-inch overall length fits standard pin gage handles and bench fixtures
• Includes Certificate of Accuracy with NIST traceability for quality system documentation

Compatibility

Designed for use with standard pin gage handles and compatible with setting micrometers, verniers, and other precision measuring devices requiring a 3.89 mm Class ZZ NoGo reference.

Installation Notes

Pin gages should be handled with clean, dry hands or lint-free gloves to prevent corrosion from skin contact. Store the gage in its protective case when not in use and apply a light coat of instrument oil if the gage will be stored for extended periods. Do not force the gage into a feature; light hand pressure is sufficient for a valid NoGo check. Inspect the gage surface for nicks or wear before each use and remove from service if any damage is observed.