Spi 19-677-4 Class Zz Minus Plug Pin Gage 0.677 in

Product Description

The SPI 19-677-4 is a Class ZZ minus plug pin gage machined from steel, designed to verify that a hole or bore falls within a specified dimensional tolerance. At 0.677 inches in diameter with a tolerance of 0.0002 inches, this gage is used as a GO or NO-GO reference in precision inspection workflows. Class ZZ designates the standard commercial grade for plug gages, making this tool suitable for general-purpose dimensional inspection in manufacturing, machining, and quality control environments. Machinists, toolmakers, and quality technicians use plug gages like this one to confirm bore size conformance without the need for complex measuring instruments.

This gage is suited for inspection of drilled, reamed, or bored holes in production and job-shop settings. It is used in both light manufacturing and heavy industrial environments where hole tolerances must be verified quickly and consistently. The minus designation indicates the gage is manufactured to the lower allowable tolerance boundary, making it appropriate for NO-GO applications in standard plug gage practice. Typical users include machinists, quality control inspectors, and tool and die professionals working to drawing-specified tolerances.

Key Features

• Class ZZ tolerance grade for general-purpose commercial inspection use
• Minus designation for lower tolerance boundary application
• 0.677 inches nominal diameter for precise bore verification
• 0.0002 inches dimensional tolerance for accurate go or no-go inspection
• Steel construction for durability and wear resistance in shop environments

Compatibility

Designed as a standard Class ZZ minus plug pin gage for use in general-purpose bore and hole inspection applications where a 0.677 inch nominal diameter reference is required.

Installation Notes

Plug pin gages are handled and used by machinists and quality control technicians and do not require installation in the traditional sense. Store the gage in a protective case when not in use to prevent damage to the precision-ground surface. Handle with clean, dry hands or cotton gloves to avoid corrosion from skin oils. Always clean the gage and the bore being checked before use to ensure accurate readings.