Spi 29-029-6 Class Zz Plus Plug Gage 0.029 in

Product Description

The SPI 29-029-6 is a Class ZZ Plus plug gage designed for precision go/no-go measurement of small-diameter holes and bores. Built to Class ZZ Plus tolerances of 0.0002 inches, this gage gives machinists and quality technicians a reliable, fast method to verify hole diameter conformance during production inspection. The measuring diameter is 0.029 inches, making it suited for fine-bore work where tight dimensional control is critical. The steel construction provides durability through repeated gauge cycles without significant wear to the measuring surface.

This plug gage is used in machine shops, manufacturing facilities, and quality control environments where small-bore verification is required. It is a standard hand tool for toolmakers, machinists, and QC inspectors performing in-process or final inspection of drilled, reamed, or punched holes. The compact size and single-end design make it practical for bench inspection and inline production checks.

Key Features

• Class ZZ Plus tolerance rating at 0.0002 inches for precision go/no-go inspection
• Measuring diameter of 0.029 inches for fine-bore applications
• Steel construction for durability and dimensional stability
• Compact single-piece design suited for bench and production line inspection
• Consistent repeatability for high-volume inspection workflows

Compatibility

Designed as an OEM-style precision inspection gage for use in standard go/no-go gage handle systems compatible with Class ZZ Plus plug gage blanks of 0.029 inches diameter.

Installation Notes

This gage is handled and used by machinists, toolmakers, and quality control inspectors. No power or special tooling is required for use. Store the gage in its protective case or sleeve when not in use to prevent damage to the precision measuring surface. Do not force the gage into a bore, as improper use can damage both the gage and the workpiece.