Spi 29-448-8 Class Zz Plus Plug Gage 0.448 Inch

Product Description

The SPI 29-448-8 is a Class ZZ Plus plug gage designed for precision dimensional inspection of cylindrical bores and holes at a nominal diameter of 0.448 inches. It is manufactured from steel and held to a tolerance of 0.0002 inches, making it suitable for verifying whether an inside diameter falls within acceptable go/no-go limits on the shop floor or in a quality control environment. Machinists, toolmakers, and quality technicians use plug gages like this one as a fast, reliable method for checking hole size without relying on a measuring instrument readout.

This gage is used in manufacturing, machining, and fabrication settings where hole diameter conformance must be verified to close tolerances. It is appropriate for both production inspection and incoming material verification. The 0.448-inch nominal size covers a common range used in light industrial and precision machining applications. It weighs 0.2 pounds, making it easy to handle during repetitive inspection tasks.

Key Features

• Class ZZ Plus tolerance grade for shop-floor and general-purpose inspection use
• 0.448-inch nominal diameter for checking bores and through-holes at that dimension
• 0.0002-inch tolerance for precise conformance checking
• Steel construction for durability and wear resistance under regular use
• Lightweight at 0.2 pounds for easy single-hand operation

Compatibility

Designed as an OEM-style replacement or direct-use plug gage for quality inspection of cylindrical features at 0.448 inches nominal diameter in general machining and manufacturing environments.

Installation Notes

Plug gages are handled and used by machinists and quality control technicians and require no installation in the traditional sense. Before use, clean the gage and the bore being checked to remove chips, oil, and debris that could affect accuracy. Do not force the gage into a hole; apply light, consistent hand pressure only. Store the gage in a protective case away from other tooling to prevent nicking or wear to the gage surface.