Spi 19-901-8 Class Zz Minus Plug Pin Gage 0.901 in

Product Description

The SPI 19-901-8 is a Class ZZ minus plug pin gage machined from steel and used to verify bore and hole dimensions with precision go/no-go inspection. At 0.901 inches in diameter, this gage holds a minus tolerance of 0.0002 inches, placing it within the Class ZZ specification for general-purpose dimensional inspection. It is a standard tool in quality control environments, machine shops, and manufacturing facilities where accurate hole measurement is required. Metrology technicians, machinists, and quality inspectors are the primary users.

Class ZZ minus plug gages are used in production inspection settings where verifying drilled, reamed, or bored hole sizes is part of the process workflow. The minus designation means the gage is ground to the lower end of the tolerance band, making it appropriate for checking minimum acceptable bore size. This gage is suited for use in both light manufacturing and precision machining applications where hole acceptance criteria must be documented and repeatable.

Key Features

• 0.901 inch nominal diameter for direct bore verification at that dimension
• Class ZZ tolerance class for general-purpose inspection use
• Minus tolerance ground to 0.0002 inches for lower-limit bore checking
• Steel construction for durability and dimensional stability during repeated use
• Single-piece packaging suitable for individual replacement or kit supplementing

Compatibility

Designed as a general-purpose Class ZZ minus plug gage for use in standard go/no-go inspection setups requiring a 0.901 inch nominal bore check.

Installation Notes

Plug gages are handled and used by machinists and quality control inspectors and do not require power-down procedures. Store the gage in a protective case when not in use to prevent surface damage that could affect accuracy. Clean the gage surface before each use to remove debris or oils that may affect measurement. Follow your facility calibration schedule to confirm the gage remains within tolerance over time.