Spi 29-478-5 Class Zz Plus Plug Gage 0.478 in

Product Description

The SPI 29-478-5 is a Class ZZ Plus plug gage designed to verify bore and hole diameters to a nominal measurement of 0.478 inches with a tolerance of 0.0002 inches. Manufactured from steel, this plug gage provides a reliable go/no-go reference for quality control and dimensional inspection tasks. Class ZZ is the standard tolerance class for general-purpose inspection of production parts, and the Plus designation indicates the gage is ground to the high side of the tolerance. Machinists, toolroom technicians, and quality control inspectors use plug gages like this one to confirm that drilled, reamed, or bored features meet print specifications.

This plug gage is suited for use in machine shops, toolrooms, and manufacturing inspection environments where accurate hole verification is required. It is appropriate for checking features in both ferrous and non-ferrous workpieces where the nominal diameter falls at 0.478 inches. The lightweight design, at 0.2 pounds, makes it easy to handle during high-volume inspection routines.

Key Features

• Class ZZ Plus tolerance class for general-purpose production inspection
• Nominal diameter of 0.478 inches for precise bore verification
• Tolerance of 0.0002 inches ensures accurate go/no-go assessment
• Steel construction provides durability and wear resistance during repeated use
• Lightweight at 0.2 pounds for comfortable single-hand use

Compatibility

Designed as a general-purpose plug gage for verifying 0.478-inch diameter bores and holes in standard production inspection applications.

Installation Notes

Plug gages are used by toolroom and quality control personnel and require no permanent installation. Before use, clean the gage and the feature being inspected to remove chips, coolant, and debris that could affect readings. Store the gage in a protective case when not in use to prevent surface damage that would compromise accuracy. Calibration and handling should follow ASME B89.1.5 or equivalent standards applicable to the facility.