Spi 19-871-3 Class Zz Minus Plug Pin Gage 0.871 in

Product Description

The SPI 19-871-3 is a Class ZZ minus plug pin gage machined from steel and used to verify bore and hole diameters to a high degree of precision. The gage measures 0.871 inches in diameter and holds a tolerance of 0.0002 inches, making it suitable for go/no-go inspection workflows on the shop floor or in a quality control environment. Class ZZ is the standard tolerance class for inspection-grade plug gages used in general manufacturing and machining operations. Machinists, toolmakers, and quality technicians use this type of gage to confirm that drilled, reamed, or bored features fall within specification.

This plug pin gage is appropriate for use in precision inspection applications where hole diameter verification is required. It is commonly used in machine shops, production environments, and metrology labs working with steel components and assemblies. The minus designation indicates the gage is ground to the lower end of the Class ZZ tolerance range, which is standard practice for plug gages used to check maximum material condition on hole features.

Key Features

• 0.871 inch nominal diameter for direct bore verification at that dimension
• Class ZZ tolerance class rated for general inspection-grade go/no-go use
• Minus tolerance designation ground to 0.0002 inches
• Steel construction for durability in production and inspection environments
• Single-piece package quantity suitable for individual tooling procurement

Compatibility

Designed as a standard Class ZZ minus plug pin gage for use in go/no-go inspection of 0.871 inch diameter bored, drilled, or reamed features in general machining and manufacturing applications.

Installation Notes

Plug pin gages are handled and used by machinists, toolmakers, and quality control technicians. Clean the gage and the bore being checked before use to prevent debris from affecting measurement accuracy. Store the gage in a protective case away from other tooling to prevent surface damage. Do not force the gage into a bore, as this can cause wear or damage to the gage surface and compromise accuracy.