Vermont Gage 111152100 Class Zz Plus Plug Gage 0.521 in

Product Description

The VERMONT GAGE 111152100 is a Class ZZ Plus plug gage machined from tool steel, designed to perform go inspection checks on bored holes, drilled openings, and other precision features. The gage measures a nominal diameter of 0.521 inches and holds a tolerance of 0.0002 inches, making it suitable for verifying tight-tolerance work in production and inspection environments. A 10 microinch surface finish on the gage member ensures consistent, repeatable contact with the workpiece. Each unit ships with a Certificate of Accuracy carrying NIST traceability, supporting quality-system documentation requirements. Dimensional inspectors, toolroom machinists, and quality technicians are the primary users.

This plug gage is used in applications requiring verification that a hole or bore falls within an acceptable size range. The go member confirms minimum material condition, catching undersized features before assembly. Typical deployment includes incoming inspection of machined parts, in-process checks on CNC or manual boring operations, and calibration verification of setting masters such as micrometers, verniers, and other measuring devices. The 2.0-inch overall length provides adequate grip and handle clearance for standard inspection fixtures and bench work. Conformance is governed by ASME B89.1.

Key Features

• 0.521-inch nominal diameter for go inspection of precision bores
• Class ZZ Plus tolerance of 0.0002 inches per ASME B89.1
• 10 microinch surface finish for consistent gage-member contact
• Tool steel construction for wear resistance in production use
• Includes Certificate of Accuracy with NIST traceability
• 2.0-inch overall length for standard bench inspection use

Compatibility

Designed as an ASME B89.1-compliant go plug gage for use with bores and holes nominally sized at 0.521 inches. Also suitable for setting micrometers, verniers, and other measuring devices requiring a traceable reference standard at this diameter.

Installation Notes

Plug gages are handled and applied by dimensional inspectors and quality technicians rather than installed in a system. Before use, clean the gage member and the bore being checked with a lint-free cloth to remove oils, chips, or debris that would affect the reading. Never force the go member through an undersized feature; apply only light hand pressure consistent with good gaging practice. Store the gage in its case when not in use to protect the finished surface and maintain calibration integrity.