Spi 29-898-4 Class Zz Plus Plug Gage 0.898 in Dia

Product Description

The SPI 29-898-4 is a Class ZZ Plus plug gage designed to verify that a bore or hole meets a specified dimensional tolerance. It measures an inside diameter of 0.898 inches with a tolerance of 0.0002 inches, making it suitable for precision inspection work where tight fits must be confirmed before assembly or final acceptance. Machined from steel for durability and dimensional stability, this go/no-go style gage is a standard tool in quality control environments. Metrology technicians, machinists, and quality inspectors rely on plug gages like this one to confirm conformance to engineering specifications quickly and reliably.

This gage is intended for use in machine shops, manufacturing facilities, and inspection departments where hole diameter verification is part of a standard quality process. It is appropriate for both incoming inspection and in-process checks on drilled, reamed, or bored holes. The Class ZZ Plus designation indicates a commercial-grade tolerance classification consistent with general-purpose inspection applications.

Key Features

• Nominal measurement diameter of 0.898 inches for precise bore verification
• Tolerance of 0.0002 inches meets Class ZZ Plus classification requirements
• Steel construction provides long service life and dimensional stability
• Compact and lightweight at 0.2 pounds for easy bench or field use
• Single-piece package quantity suited for individual workstation use

Compatibility

Designed as a standard Class ZZ Plus plug gage for general-purpose inspection of bored, drilled, or reamed holes with a nominal inside diameter of 0.898 inches.

Installation Notes

Plug gages are handled and used by quality technicians and machinists and require no permanent installation. Before use, clean the gage and the bore being inspected to remove chips, coolant, and debris that could affect the reading. Apply light gage oil if recommended by the facility metrology standard to prevent corrosion and reduce wear. Store the gage in its protective case when not in use to maintain calibration and surface integrity.