Spi 29-552-7 Class Zz Plus Plug Gage 0.552 in

Product Description

The SPI 29-552-7 is a Class ZZ Plus plug gage designed to verify the inside diameter of holes and bores to a nominal size of 0.552 inches. Built from steel, this go/no-go style precision tool delivers a tolerance of 0.0002 inches, making it suitable for dimensional inspection work in machine shops, manufacturing facilities, and quality control environments. Machinists, tool and die makers, and quality technicians use plug gages like this one to confirm that drilled, reamed, or bored holes fall within acceptable dimensional limits before parts move to assembly.

This gage is used in precision measurement applications where tight hole tolerances must be verified quickly and reliably. It is well suited for production inspection of machined components, incoming material checks, and process control on the shop floor. The Class ZZ Plus designation indicates this gage meets established dimensional accuracy standards appropriate for general-purpose inspection use in both job shop and production environments.

Key Features

• Nominal measurement diameter of 0.552 inches for precise hole inspection
• Tolerance of 0.0002 inches for reliable dimensional verification
• Steel construction for durability and wear resistance in shop use
• Class ZZ Plus classification meets general-purpose inspection standards
• Compact and lightweight at 0.2 pounds for easy handling at the inspection station

Compatibility

Designed as a general-purpose replacement or addition to plug gage sets used for inspecting holes with a nominal bore diameter of 0.552 inches in standard machining and quality control applications.

Installation Notes

Plug gages are handled and used by machinists and quality control technicians rather than installed in a system. Clean the gage and the bore thoroughly before use to prevent false readings from chips or debris. Do not force the gage into the hole, as this can cause wear to the gage or damage the workpiece. Store the gage in its protective case and away from other metal tools to preserve its dimensional accuracy.