Spi 19-663-4 Class Zz Minus Plug Pin Gage 0.663 in

Product Description

The SPI 19-663-4 is a Class ZZ minus plug pin gage designed to verify bore and hole diameters to a nominal size of 0.663 inches. Built from hardened steel, it holds a minus tolerance of 0.0002 inches, making it suitable for go/no-go inspection workflows in manufacturing, machining, and quality-control environments. Machinists, tool-and-die technicians, and QC inspectors use this type of gage to confirm that a finished bore falls within acceptable dimensional limits before assembly or final inspection sign-off.

Class ZZ minus plug gages are commonly used in production-floor inspection of drilled, reamed, or bored holes where dimensional verification is required. The minus designation means the gage is ground undersized relative to nominal, which is standard for plug gages used in checking hole acceptance limits. This gage is appropriate for general-purpose shop use in light industrial, precision machining, and fabrication settings where a 0.663-inch nominal bore is a common feature size.

Key Features

• 0.663-inch nominal diameter for direct bore inspection at that size
• Class ZZ tolerance class — standard for general-purpose inspection gages
• Minus tolerance ground to 0.0002 inches for consistent, repeatable measurement
• Steel construction provides durability and wear resistance in shop environments
• Single-piece package quantity — sold individually for targeted tooling needs

Compatibility

Designed as a general-purpose plug pin gage for inspecting 0.663-inch nominal diameter bores and holes in machined components across light industrial and precision manufacturing applications.

Installation Notes

Plug pin gages are used by machinists and quality-control personnel — no power tools or fasteners are required for use. Clean the gage and the bore being inspected before use to prevent debris from affecting measurement accuracy. Store the gage in a protective case when not in use to prevent nicks, corrosion, or dimensional distortion. Never force a plug gage into an undersized bore, as this can damage the gage and invalidate its calibration.