Spi 19-660-0 Class Zz Minus Plug Pin Gage 0.66 Inch

Product Description

The SPI 19-660-0 is a Class ZZ minus plug pin gage used to verify hole diameters and bore tolerances in precision machining and inspection workflows. At 0.66 inches in diameter with a minus tolerance of 0.0002 inches, this gage is a go-type instrument — it confirms that a hole is at or above minimum acceptable size. Constructed from steel for durability and dimensional stability, it is a standard tool in quality control environments where tight-tolerance verification is required. Machinists, toolmakers, and quality inspectors use plug gages like this one during in-process and final inspection of drilled, reamed, or bored holes.

This gage is suited for use in manufacturing, machine shops, and inspection departments where hole diameter conformance must be verified against a defined tolerance. Class ZZ plug gages are general-purpose inspection tools appropriate for production-level go/no-go gauging applications. The minus designation indicates the gage is ground to the lower limit of the tolerance range, functioning as a go gage to confirm minimum acceptable hole size. It is a single-end gage intended for manual hand use.

Key Features

• 0.66 inch nominal diameter for direct hole-size verification
• Class ZZ tolerance rating suitable for general production inspection
• Minus tolerance of 0.0002 inches for go-gage lower-limit gauging
• Steel construction for wear resistance and dimensional stability
• Compact and lightweight at 0.2 pounds for easy hand use

Compatibility

Designed as a general-purpose Class ZZ minus plug gage for verifying 0.66 inch nominal diameter bores in standard production and inspection applications.

Installation Notes

Plug gages are handled and used by machinists and quality control inspectors — no installation is required. Store the gage in a protective case away from temperature extremes and contaminants to maintain calibration. Clean the gage and the bore with a lint-free cloth before use to prevent false readings. Do not force the gage into an undersized hole, as this can damage the gage land and compromise its accuracy.