Spi 29-797-8 Class Zz Plus Plug Gage 0.797 in

Product Description

The SPI 29-797-8 is a Class ZZ Plus plug gage designed for go/no-go inspection of cylindrical bores and holes at a nominal diameter of 0.797 inches. Built from steel, this gage checks whether a machined feature falls within acceptable tolerance limits. The Class ZZ Plus designation indicates a working-grade inspection tool with a tolerance of 0.0002 inches, suitable for general production and incoming inspection tasks. Machinists, quality control technicians, and tool-room professionals use plug gages like this to verify hole size quickly and repeatedly without the setup time required by variable measurement instruments.

This plug gage is used in manufacturing and machine shop environments where bore size must be confirmed to close tolerances. It is suited to both production-floor inspection and receiving inspection of machined components. Applications include verifying drilled, reamed, or bored holes in metal parts across a wide range of industries including automotive, aerospace, and general industrial fabrication. Its compact size and steel construction make it practical for repeated use in moderate-volume inspection workflows.

Key Features

• Class ZZ Plus tolerance grade at 0.0002 inches for general-purpose working inspection
• Nominal measurement diameter of 0.797 inches
• Steel construction for durability in production environments
• Lightweight at 0.2 pounds for easy one-hand handling
• Single-piece package — ready to use straight from the box

Compatibility

Designed as a working-grade plug gage for inspection of cylindrical bores and holes nominally sized at 0.797 inches in diameter across general manufacturing applications.

Installation Notes

Plug gages are handled and used by machinists and quality control inspectors — no power tools or electrical shutoff procedures are required. Keep the gage clean and lightly oiled when not in use to prevent corrosion of the steel surface. Do not force the gage into an undersized bore, as this can damage both the gage and the workpiece. Store separately from other tooling to avoid contact damage to the precision-ground surface.