Spi 19-640-2 Class Zz Minus Plug Pin Gage 0.64 in

Product Description

The SPI 19-640-2 is a Class ZZ minus plug pin gage used to verify bore and hole diameters to precise tolerances in manufacturing and inspection environments. The gage measures 0.64 inches in diameter and is manufactured from steel for durability in production and quality-control applications. With a tolerance of 0.0002 inches, the 19-640-2 conforms to Class ZZ specifications, which are the standard go/no-go tolerance class for general-purpose inspection in shop-floor and toolroom use. Machinists, toolmakers, and quality technicians use plug pin gages like this to confirm that drilled, reamed, or bored holes fall within acceptable dimensional limits before parts advance to assembly.

This gage is suited for use in metalworking shops, fabrication facilities, and precision manufacturing environments where hole diameter verification is required. Class ZZ minus plug gages are commonly used for incoming inspection, in-process checks, and final part verification. The minus designation indicates the gage is ground to the low side of the nominal tolerance, consistent with standard go-gage practice. Installation and use require no special tools, though gages should be handled with clean dry hands or lint-free gloves to prevent corrosion and preserve calibration integrity.

Key Features

• Class ZZ tolerance class for general-purpose shop and toolroom inspection
• Minus designation ground to the low side of nominal for go-gage application
• 0.0002 inch tolerance for reliable dimensional verification
• Steel construction for wear resistance in production environments
• 0.64 inch nominal diameter for mid-range bore inspection

Compatibility

Designed as a standard Class ZZ minus plug pin gage for general-purpose hole and bore diameter inspection in metalworking and precision manufacturing applications.

Installation Notes

Plug pin gages are used by machinists and quality technicians and require no installation tools. Before use, clean the gage and the bore being checked to remove chips, coolant, and debris that could affect measurement accuracy. Do not force the gage into an undersized hole, as this can damage the gage surface and compromise calibration. Store gages in a protective case away from other tooling to prevent nicking or corrosion.