Spi 29-958-6 Class Zz Plus Plug Gage 0.958 in

Product Description

The SPI 29-958-6 is a Class ZZ Plus plug gage used to verify the dimensional accuracy of drilled, reamed, or bored holes. Machined from steel, it checks whether a bore or hole meets a specified diameter tolerance by confirming go or no-go acceptance. The nominal measurement diameter is 0.958 inches with a tolerance of 0.0002 inches, placing it in the Class ZZ Plus accuracy tier suited for general industrial inspection and quality control work. Toolmakers, machinists, and quality technicians use this type of gage in production and inspection environments where consistent hole verification is required.

This plug gage is suited for use in manufacturing, machine shops, and inspection departments handling medium-diameter bore verification. It is appropriate for production-line inspection of machined components where bore size must be confirmed against a defined dimensional standard. The 0.958-inch diameter makes it a common fit for checking holes produced by drilling or reaming operations in both light and heavy manufacturing contexts.

Key Features

• Nominal diameter of 0.958 inches for precise bore verification
• Class ZZ Plus tolerance of 0.0002 inches for reliable go or no-go inspection
• Steel construction for durability and dimensional stability during repeated use
• Compact and lightweight at 0.2 pounds for easy handling at the inspection station
• Single-piece unit packaged individually for direct deployment

Compatibility

Designed as a standard Class ZZ Plus plug gage for use with any inspection or quality control application requiring 0.958-inch bore verification in accordance with applicable dimensional gaging standards.

Installation Notes

Plug gages should be handled by qualified machinists or quality technicians following established metrology practices. Before use, clean both the gage and the bore thoroughly to remove chips, oils, or debris that could affect measurement accuracy. Store the gage in its protective case when not in use to prevent damage to the precision-ground surface. Do not force the gage into a bore, as this can cause wear or damage that affects calibration.