Spi 29-508-9 Class Zz Plus Plug Gage 0.508 in Dia

Product Description

The SPI 29-508-9 is a Class ZZ Plus plug gage machined to a nominal diameter of 0.508 inches with a tolerance of 0.0002 inches. Plug gages of this class are used to verify whether a drilled, reamed, or bored hole falls within a specified acceptable range. The Class ZZ Plus designation indicates a tighter tolerance grade suited for inspection of medium-precision work. Constructed from steel, this gage provides the durability and dimensional stability required in production and quality-control environments. Machinists, toolmakers, and quality inspectors use plug gages as a fast, reliable go/no-go check during part verification.

This gage is appropriate for inspection tasks in machining shops, manufacturing facilities, and toolrooms where hole diameter verification is a routine step in the production process. It is suited for checking through-holes and blind holes in workpieces where a 0.508-inch nominal diameter is the specified dimension. The single-piece package makes it a straightforward addition to an inspection kit or gage set.

Key Features

• Nominal measurement diameter of 0.508 inches for precise hole inspection
• Tolerance of 0.0002 inches (0.0002 mm) meeting Class ZZ Plus grade requirements
• Steel construction for wear resistance and long service life
• Compact and lightweight at 0.2 pounds for easy bench and in-line use
• Single-unit packaging with a minimum order quantity of 1

Compatibility

Designed as a standard Class ZZ Plus plug gage for verifying 0.508-inch nominal diameter holes in general machining and inspection applications.

Installation Notes

Plug gages are handled and used by machinists, quality technicians, and toolroom inspectors rather than installed in a permanent sense. Before use, clean the gage and the workpiece bore thoroughly to prevent debris from affecting the measurement. Apply light gage oil if recommended by your facility's calibration procedures to reduce wear on the gage surface. Store the gage in a protective case away from other metal tools to prevent surface damage that could compromise dimensional accuracy.