Spi 19-666-7 Class Zz Minus Plug Pin Gage 0.666 in

Product Description

The SPI 19-666-7 is a Class ZZ minus plug pin gage machined from steel and used to verify bore and hole dimensions in precision measurement applications. Sized at 0.666 inches in diameter with a minus tolerance of 0.000200 inches, this gage checks whether a feature falls within its specified lower limit. Class ZZ is the standard tolerance grade for inspection and production floor use. The steel construction provides the hardness and dimensional stability required for repeatable contact measurement. Machinists, quality control technicians, and toolroom professionals use plug gages like this one as a straightforward go/no-go or variable measurement tool.

This pin gage is suited for inspection of drilled, reamed, or bored holes in manufacturing and fabrication environments, both on the production floor and in quality labs. It is used wherever a 0.666-inch nominal diameter feature must be verified against a lower-limit tolerance condition. The minus designation means the gage is ground below nominal, confirming the minimum acceptable size boundary. It is appropriate for light to medium inspection duty in metalworking, machining, and general industrial settings.

Key Features

• Class ZZ tolerance grade suitable for production and inspection floor use
• Minus plug configuration checks the lower limit of a 0.666-inch diameter feature
• Tolerance of 0.000200 inches for precise dimensional verification
• Steel construction for hardness, wear resistance, and dimensional stability
• Single-piece package ready for immediate use upon receipt

Compatibility

Designed as a standard Class ZZ minus plug pin gage for use with 0.666-inch nominal diameter bores and holes in general industrial and manufacturing inspection applications.

Installation Notes

Plug pin gages are handled and used by quality technicians and machinists — no power source or mechanical installation is required. Clean the gage and the feature being measured before use to prevent debris from affecting readings. Store the gage in a protective case away from temperature extremes to preserve calibration and surface integrity. Periodic recalibration against traceable standards is recommended to maintain measurement accuracy over time.