Spi 29-542-8 Class Zz Plus Plug Gage 0.542 in

Product Description

The SPI 29-542-8 is a Class ZZ Plus plug gage used to verify inside diameters in precision machining and inspection workflows. It measures a nominal bore diameter of 0.542 inches with a tolerance of 0.0002 inches, placing it in the Class ZZ Plus accuracy tier suited for general-purpose go/no-go inspection. Constructed from steel, this gage is built to withstand repeated use in production and quality-control environments. Machinists, toolroom technicians, and quality inspectors use plug gages like this one to confirm that drilled, reamed, or bored holes meet drawing specifications before parts advance to assembly.

This gage is appropriate for use in job shops, manufacturing facilities, and inspection departments where hole-diameter verification is part of routine first-article or in-process inspection. It is sized for applications requiring a 0.542-inch nominal bore check, which commonly appears in mechanical component machining. The compact, single-piece design makes it easy to handle during bench inspection or on the shop floor.

Key Features

• Nominal measurement diameter of 0.542 inches for precise bore verification
• Class ZZ Plus tolerance of 0.0002 inches for general-purpose inspection accuracy
• Steel construction for durability and resistance to wear over repeated use
• Single-piece plug design for straightforward go/no-go inspection workflows
• Lightweight at 0.2 pounds for easy bench or floor handling

Compatibility

Designed as a general-purpose Class ZZ Plus plug gage for inspecting 0.542-inch nominal inside diameters in standard machining and quality-control applications.

Installation Notes

Plug gages are handled by machinists and quality technicians and require no permanent installation. Before use, clean both the gage and the bore to be measured to remove chips, coolant, or debris that could affect readings. Do not force the gage into an undersized bore, as this can damage the gage surface and compromise measurement accuracy. Store the gage in a protective case away from abrasive materials to maintain its calibrated tolerance.