Spi 29-298-7 Class Zz Plus Plug Gage 0.298 in

Product Description

The SPI 29-298-7 is a Class ZZ Plus plug gage designed to verify the diameter of holes and bores to a nominal measurement of 0.298 inches. Built from steel, this go-type gage provides a tolerance of 0.0002 inches, making it suitable for precision inspection work in machine shops, manufacturing floors, and maintenance environments. Class ZZ gages are the standard choice for production inspection of general-tolerance holes, and the Plus designation indicates the gage is manufactured to the high end of the tolerance range. Machinists, quality technicians, and tool-room professionals use plug gages like this one as a fast, repeatable method to confirm bore size without complex measurement setups.

This gage is used wherever a 0.298-inch diameter hole must be verified for conformance to print. Typical applications include inspection of drilled, reamed, or punched holes in metal fabrication, light manufacturing, and precision machining operations. The compact size and single-piece construction make it well suited for both bench inspection and inline production checks. It is appropriate for residential shop and commercial industrial settings where repeatable hole gauging is required.

Key Features

• Nominal measurement diameter of 0.298 inches for direct go-type hole inspection
• Class ZZ Plus tolerance of 0.0002 inches for reliable production gauging
• Steel construction for durability in shop and production environments
• Single-piece design allows fast, repeatable checks without additional setup
• Compact form factor suitable for bench use or inline inspection

Compatibility

Designed as a standard Class ZZ Plus plug gage for inspection of 0.298-inch nominal diameter holes in general production and tool-room applications.

Installation Notes

Plug gages are used by quality technicians and machinists and require no permanent installation. Before use, clean the gage and the bore being inspected to remove chips, oil, or debris that could affect the reading. Handle the gage carefully to avoid nicks or corrosion that would alter its calibrated diameter. Store the gage in a protective case away from other tooling to maintain calibration integrity.