Spi 29-546-9 Class Zz Plus Plug Gage 0.546 Inch

Product Description

The SPI 29-546-9 is a Class ZZ Plus plug gage designed for precision measurement and go/no-go inspection of cylindrical bores and holes. It measures a nominal diameter of 0.546 inches with a tolerance of 0.0002 inches, making it suitable for quality control work where close tolerances must be verified. Constructed from steel, the gage is built to withstand repeated use in shop environments. Machinists, toolmakers, and quality inspectors use plug gages like this one to confirm that drilled, reamed, or bored holes fall within specified dimensional limits without relying on variable measuring instruments.

This plug gage is used in manufacturing and machine shop settings where hole diameter must be confirmed to tight tolerances. It is appropriate for both production-floor inspection and toolroom verification tasks. The Class ZZ Plus designation indicates it meets a defined accuracy grade suited for general inspection of commercial-tolerance work. It is a single-diameter gage intended for hands-on use by trained inspection personnel.

Key Features

• Nominal measurement diameter of 0.546 inches for precise bore inspection
• Tolerance of 0.0002 inches meeting Class ZZ Plus accuracy grade
• Steel construction for durability in shop and toolroom environments
• Compact and lightweight at 0.2 pounds for easy handling
• Go/no-go style inspection reduces dependence on variable instruments

Compatibility

Designed as a direct-use plug gage for inspecting cylindrical holes and bores with a nominal diameter of 0.546 inches in general machining and quality control applications.

Installation Notes

Plug gages are handled and used by machinists or quality inspectors, not installed in the traditional sense. Clean the gage and the bore being inspected before use to prevent measurement error from debris or burrs. Store the gage in a protective case and avoid dropping or striking it, as impact can alter the precision ground surface and invalidate measurements. Follow your facility's gage calibration and handling procedures to maintain traceability.