Vermont Gage 112301770 Class Zz Plus Plug Gage 1.77 Mm

Product Description

The VERMONT GAGE 112301770 is a Class ZZ Plus plug gage designed for precise go inspection of small-diameter bores and holes. Machined from tool steel, this gage checks whether a feature falls within the acceptable tolerance range during production or quality control workflows. It carries a 1.77 mm diameter with a tolerance of 0.005 mm (0.00508 mm actual), and a 10 microfinish surface finish that supports accurate, repeatable contact measurements. Every unit ships with a Certificate of Accuracy backed by NIST traceability, meeting ASME B89.1 standards. Machinists, quality technicians, and inspection personnel rely on this type of gage for fast, definitive attribute inspection at the bench or on the floor.

This plug gage is suited for go inspection tasks in precision manufacturing, tool and die, aerospace, and general metrology environments. It is also used to set micrometers, verniers, and other measuring devices requiring a certified reference. The 1.77 mm diameter targets small-bore applications where direct measurement with calipers or micrometers may introduce unacceptable uncertainty. Its compact overall length of 2.0000 inches makes it practical for use in tight clearance applications and standard gage blocks setups. Professional metrology labs and production floor QC stations are the primary install environments.

Key Features

• 1.77 mm go inspection diameter with 0.005 mm tolerance for precise attribute checking
• 10 microfinish surface finish promotes consistent, low-distortion contact with the bore surface
• Tool steel construction provides hardness and wear resistance for repeated use
• Meets ASME B89.1 dimensional gage standards
• Includes Certificate of Accuracy with full NIST traceability
• Overall length of 2.0000 inches suits bench and floor inspection setups

Compatibility

Designed as a Class ZZ Plus go plug gage for use with go inspection routines, and suitable for setting micrometers, verniers, and other calibrated measuring devices requiring a NIST-traceable reference at 1.77 mm diameter.

Installation Notes

Plug gages are handled and used by quality technicians and metrologists — not typically installed in a system, but stored and deployed following standard gage care procedures. Keep the gage clean and lightly oiled when not in use to prevent corrosion on the tool steel. Never force a plug gage into a bore; if it does not pass freely under hand pressure during a go check, the feature is out of tolerance. Store in a protective case away from temperature extremes to maintain dimensional stability and protect the certificate of accuracy.