Spi 19-664-2 Class Zz Minus Plug Pin Gage 0.664 in

Product Description

The SPI 19-664-2 is a Class ZZ minus plug pin gage designed to verify bore and hole diameters with precision. This gage measures 0.664 inches in diameter and holds a tolerance of 0.0002 inches, making it appropriate for go/no-go inspection workflows and dimensional quality checks. Manufactured from steel for durability and dimensional stability, it is used by machinists, toolroom technicians, and quality control inspectors who require reliable, repeatable measurement of internal features. Class ZZ is the standard commercial tolerance class for plug gages, suitable for general-purpose inspection of production parts.

This pin gage is used in manufacturing, fabrication, and toolroom environments where bore diameter verification is required. It is suited for checking drilled, reamed, or bored holes in production and inspection settings. The 0.664 inch nominal size makes it a direct-use gage for corresponding nominal hole sizes in general machining applications. Packaged individually, it is available as a single-unit purchase for spot replacement or expanding an existing gage set.

Key Features

• Class ZZ tolerance class for general-purpose commercial inspection use
• Minus designation indicates the gage is sized below nominal for proper go/no-go application
• 0.0002 inches tolerance for consistent, reliable dimensional verification
• Steel construction provides wear resistance and long service life
• 0.664 inch diameter nominal size for direct bore verification

Compatibility

Designed as a general-purpose Class ZZ minus plug pin gage for use in standard go/no-go inspection of 0.664 inch nominal diameter bores and holes across common machining and fabrication applications.

Installation Notes

Plug pin gages are handled and used by machinists and quality control technicians following standard metrology practices. Gages should be kept clean and lightly oiled when stored to prevent corrosion and maintain dimensional accuracy. Do not force a plug gage into an undersized bore, as this can damage both the gage and the workpiece. Periodic calibration against a traceable standard is recommended to confirm gage accuracy over time.