Spi 19-859-8 Class Zz Minus Plug Pin Gage 0.859 in

Product Description

The SPI 19-859-8 is a Class ZZ minus plug pin gage machined to a 0.859-inch nominal diameter with a tolerance of 0.0002 inches. Plug pin gages are precision measurement tools used to verify the diameter of bored holes, machined ports, and other cylindrical features. The Class ZZ designation indicates a working-grade gage appropriate for production inspection and shop-floor dimensional verification. Constructed from steel, this gage provides the rigidity and wear resistance required for repeated use in industrial and manufacturing environments. It is handled by machinists, quality control inspectors, and tool-and-die professionals.

This gage is suited for production floor and inspection room applications where hole diameter must be confirmed to close tolerances. It is used to check machined components, castings, and fabricated parts during in-process and final inspection. The minus designation means the gage is ground to the lower boundary of the nominal size, making it appropriate for go-gage applications where confirming minimum acceptable hole size is required. It is a standard single-piece pin gage compatible with common pin gage handle sets.

Key Features

• 0.859-inch nominal diameter for precise hole verification
• Class ZZ working-grade tolerance of 0.0002 inches
• Minus designation for go-gage lower-limit inspection
• Steel construction for durability and dimensional stability
• Compatible with standard pin gage handle sets

Compatibility

Designed as a standard Class ZZ minus plug pin gage for use with common pin gage handle sets in production inspection and shop-floor dimensional verification applications.

Installation Notes

Pin gages are installed and used by machinists and quality control inspectors. Before use, clean both the gage and the part bore with a lint-free cloth to remove oil, chips, and debris that could affect measurement accuracy. Handle the gage with care to avoid dropping, as impact can alter the ground diameter. Store pin gages in a protective case away from other tools to prevent surface damage.