Spi 29-503-0 Class Zz Plus Plug Gage 0.503 Inch

Product Description

The SPI 29-503-0 is a Class ZZ Plus plug gage designed to verify bore diameters with a nominal measurement size of 0.503 inches and a tolerance of 0.0002 inches. Manufactured from steel, this go/no-go style gage provides a reliable reference for inspecting hole dimensions on the shop floor or in a quality control environment. Class ZZ gages meet standard tolerance grades for general-purpose inspection work. Machinists, toolmakers, and quality technicians use plug gages like this one to confirm that drilled, reamed, or bored holes fall within specified limits before parts advance in production.

This gage is suited for use in machine shops, manufacturing facilities, and precision fabrication environments where hole diameter verification is part of standard inspection protocol. It is appropriate for both production-line inspection and incoming goods checks on machined components. The 0.503-inch diameter makes it a direct-check tool for bores held to close dimensional tolerances in steel, aluminum, and similar workpiece materials.

Key Features

• Nominal measurement diameter of 0.503 inches for precise bore verification
• Class ZZ Plus tolerance grade at 0.0002 inches for general-purpose inspection
• Steel construction for durability and dimensional stability in shop environments
• Single-piece package quantity suitable for individual station use
• Compact and lightweight at 0.2 pounds for easy handling at the inspection point

Compatibility

Designed as a standard Class ZZ Plus plug gage for general-purpose bore inspection of holes with a nominal diameter of 0.503 inches in machined components.

Installation Notes

Plug gages are typically handled by machinists or quality control technicians and require no permanent installation. Store the gage in a protective case away from moisture and contaminants to preserve its tolerance integrity. Clean the gage and the bore being checked before use to avoid false readings caused by chips or debris. Do not force the gage into an undersize hole, as this can damage the gage surface and invalidate future measurements.