Spi 29-804-2 Class Zz Plus Plug Gage 0.804 in

Product Description

The SPI 29-804-2 is a Class ZZ Plus plug gage designed to verify bore and hole diameters to a nominal size of 0.804 inches. Built from steel, it holds a tolerance of 0.0002 inches, making it suited for production inspection and quality control work where close-tolerance verification is required. Class ZZ is the standard grade for general-purpose go/no-go inspection of non-precision fits, and the Plus designation reflects positive-tolerance offset to extend gage service life. Machinists, toolroom technicians, and quality inspectors use plug gages like this one to confirm that drilled, reamed, or bored features fall within acceptable dimensional limits before parts move to the next stage of production.

This gage is appropriate for shop-floor and toolroom use in both job-shop and production environments. It is used to inspect holes in machined metal components where a 0.804-inch nominal diameter is the target dimension. Because the tolerance is held in decimal inches, it integrates directly into inch-based inspection processes without conversion. The steel construction provides durability for repeated insertion cycles in standard manufacturing inspection routines.

Key Features

• Nominal diameter of 0.804 inches for direct bore verification at that target size
• Class ZZ Plus tolerance grade of 0.0002 inches for general-purpose go/no-go inspection
• Steel construction provides durability through repeated use in production inspection
• Plus-tolerance offset extends usable gage life before regrind or replacement is needed
• Lightweight at 0.2 pounds for easy single-hand use during inspection

Compatibility

Designed as a general-purpose Class ZZ Plus plug gage for inspecting 0.804-inch nominal diameter bores in machined components across standard inch-based manufacturing inspection applications.

Installation Notes

Plug gages are handled and used by quality technicians and machinists and do not require installation in the traditional sense. Before use, clean the gage and bore surfaces to remove chips, coolant, and debris that could cause false readings or scoring. Never force a plug gage into an undersized hole, as this can damage the gage surface and compromise calibration. Store the gage in a protective case away from other tooling to prevent nicking the precision-ground diameter.