Spi 29-820-8 Class Zz Plus Plug Gage 0.82 Inch

Product Description

The SPI 29-820-8 is a Class ZZ Plus plug gage designed for precision hole measurement in industrial and manufacturing environments. This fixed-limit gage checks whether a bored, drilled, or reamed hole falls within an acceptable dimensional range. It is manufactured from steel and measures holes at a nominal diameter of 0.82 inches with a tolerance of 0.0002 inches, making it appropriate for applications that require close dimensional control. Machinists, quality control technicians, and tool room personnel are the primary users of this type of gage in production and inspection settings.

This plug gage is suited for go/no-go inspection routines in machine shops, fabrication facilities, and quality inspection departments. It is used on production floors where hole diameter conformance must be verified quickly and reliably. The Class ZZ Plus designation indicates it meets a recognized tolerance class for fixed-limit plain plug gages used in moderate-tolerance inspection work. It is well matched to applications where consistent, repeatable hole verification is required across multiple parts or production runs.

Key Features

• Nominal measurement diameter of 0.82 inches for fixed-limit hole inspection
• Tolerance of 0.0002 inches for close dimensional verification
• Steel construction for durability in production and inspection environments
• Class ZZ Plus designation for recognized tolerance-class compliance
• Compact and lightweight at 0.2 pounds for easy handling during inspection

Compatibility

Designed as an OEM-style fixed-limit plain plug gage for use in standard go/no-go hole inspection applications requiring a nominal diameter of 0.82 inches.

Installation Notes

Plug gages are handled and used by machinists and quality control technicians — no special tools are required for use, but proper gage handling procedures should be followed to avoid surface damage. Keep the gage clean and lightly oiled when not in use to prevent corrosion on the steel surfaces. Store the gage in its protective case away from other metal tooling to avoid nicks or dimensional damage. Periodic calibration against a traceable standard is recommended to verify ongoing accuracy.