Spi 29-579-0 Class Zz Plus Plug Gage 0.579 in Dia

Product Description

The SPI 29-579-0 is a Class ZZ Plus plug gage designed to verify bore and hole diameters to a nominal size of 0.579 inches. Built from steel, it delivers a dimensional tolerance of 0.0002 inches, making it suitable for go/no-go inspection work in production and quality-control environments. Machinists, tool-and-die technicians, and quality inspectors use plug gages like this one to confirm that drilled, reamed, or bored holes meet tight dimensional requirements before parts proceed to assembly. The Class ZZ Plus designation indicates a ground-finish tolerance class appropriate for general workshop and inspection use.

This plug gage is used in machine shops, manufacturing facilities, and maintenance environments where precise hole verification is required. It is well suited for checking work-piece bores in metal fabrication and light mechanical assembly applications. The 0.579-inch nominal diameter targets a specific hole size common in precision-component work, and the tight 0.0002-inch tolerance supports consistent, repeatable inspection results across production runs.

Key Features

• Class ZZ Plus tolerance class for general-purpose precision inspection
• Nominal measurement diameter of 0.579 inches for targeted hole checking
• Dimensional tolerance of 0.0002 inches for reliable go/no-go verification
• Steel construction for durability and wear resistance in shop environments
• Compact and lightweight at 0.2 pounds for easy single-hand use

Compatibility

Designed as a direct-use plug gage for inspecting holes and bores with a nominal diameter of 0.579 inches in standard shop and quality-control applications.

Installation Notes

Plug gages are handled and applied by machinists or quality-inspection personnel and require no permanent installation. 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 temperature extremes to maintain dimensional stability. Do not force the gage into undersized bores, as this can damage the gage surface and compromise future measurement integrity.