Spi 29-419-9 Class Zz Plus Plug Gage 0.419 in

Product Description

The SPI 29-419-9 is a Class ZZ Plus plug gage designed to verify the diameter of machined holes and bores to a nominal size of 0.419 inches. Built from steel, this go/no-go style gage provides a tolerance of 0.0002 inches, making it suitable for production inspection and quality control work where dimensional accuracy is critical. Machinists, toolmakers, and quality control technicians use plug gages like this one to confirm that finished bores fall within specified tolerance limits before parts advance through the manufacturing process.

This gage is used in machine shops, manufacturing facilities, and tool rooms for inspection of drilled, reamed, or bored holes in metal and other hard materials. The 0.419-inch nominal diameter targets mid-range bore sizes common in general precision machining. It is suited to incoming inspection, in-process checks, and final part verification on production lines where consistent hole sizing is required.

Key Features

• Nominal measurement diameter of 0.419 inches for precise bore inspection
• Class ZZ Plus tolerance of 0.0002 inches for reliable go/no-go checking
• Steel construction for durability in shop environments
• Compact and lightweight at 0.2 pounds for easy one-hand use
• Single-piece packaging, ready for immediate use out of the box

Compatibility

Designed as a standard Class ZZ Plus plug gage for inspection of 0.419-inch nominal diameter bores in general precision machining and manufacturing applications.

Installation Notes

Plug gages are used by machinists and quality control personnel and require no installation. Before use, clean the gage and the bore being checked to remove chips, oil, or debris that could affect measurement accuracy. Do not force the gage into an undersized bore, as this can damage the gage surface and compromise calibration. Gages should be recalibrated periodically per applicable shop quality standards to ensure continued measurement accuracy.