Spi 19-487-8 Class Zz Minus Plug Pin Gage 0.487 in

Product Description

The SPI 19-487-8 is a Class ZZ minus plug pin gage with a nominal diameter of 0.487 inches and a tolerance of 0.0002 inches. Plug pin gages are single-end go or no-go inspection tools used to verify bore diameters, hole sizes, and internal feature dimensions to a defined tolerance class. This gage is constructed from steel for durability and dimensional stability under repeated use. Class ZZ is the standard industrial tolerance class for plug gages, appropriate for general-purpose inspection work. The minus designation indicates the gage is ground to the lower end of the tolerance band. Machinists, quality inspectors, and tool and die technicians use this type of gage as part of routine dimensional inspection workflows on the shop floor or in a quality lab.

This plug pin gage is suited for checking 0.487-inch nominal holes and bores in production and inspection environments. It is used in machine shops, manufacturing facilities, and tool rooms where consistent bore verification is required. Typical applications include checking drilled, reamed, or bored holes in metal components during in-process or final inspection. The gage is handled manually and does not require power or calibrated instruments beyond the gage itself. It is appropriate for both high-volume production checks and low-volume precision work.

Key Features

• Class ZZ tolerance class for general-purpose industrial inspection
• Minus designation — ground to the lower end of the tolerance band
• 0.0002-inch tolerance for precise bore verification
• Steel construction for dimensional stability and wear resistance
• 0.487-inch nominal diameter for direct go/no-go hole inspection

Compatibility

Designed as a standard Class ZZ minus plug pin gage for use in general-purpose dimensional inspection of 0.487-inch nominal bore features across common industrial and machining applications.

Installation Notes

Plug pin gages should be handled and stored with care to avoid nicks, burrs, or corrosion that would affect accuracy. Always clean the gage and the bore being checked before use. Apply light gage oil when storing to prevent rust on the steel body. Gages should be periodically re-calibrated or verified against certified reference standards per your facility quality system requirements.