Spi 29-452-0 Class Zz Plus Plug Gage 0.452 Inch

Product Description

The SPI 29-452-0 is a Class ZZ Plus plug gage used to verify the internal diameter of holes and bores to a nominal size of 0.452 inches. It holds a tolerance of 0.0002 inches, making it suitable for go/no-go inspection work in machining, tooling, and quality control environments. Constructed from steel, the gage maintains dimensional stability under repeated use. Machinists, quality inspectors, and precision tooling technicians are the primary users. The Class ZZ Plus designation indicates a commercial-grade tolerance class appropriate for inspection of medium-tolerance production work.

This plug gage is used in machine shops, manufacturing facilities, and maintenance environments where hole diameter verification is required. It applies to inspection of drilled, reamed, or bored holes in metal, plastic, or composite workpieces where the nominal bore diameter is 0.452 inches. It is a standard single-member gage suited for bench inspection and in-process quality checks.

Key Features

• Nominal measurement diameter of 0.452 inches for precise bore inspection
• Tolerance of 0.0002 inches meets Class ZZ Plus classification requirements
• Steel construction provides durability and dimensional stability
• Compact and lightweight at 0.2 pounds for easy bench or floor use
• Single-piece gage design for straightforward go/no-go inspection workflow

Compatibility

Designed as a standard Class ZZ Plus plug gage for inspection of bores and holes with a nominal diameter of 0.452 inches across general machining and manufacturing applications.

Installation Notes

Plug gages are handled and used by machinists and quality control inspectors and do not require installation in the traditional sense. Clean the gage and the bore being checked before use to prevent debris from affecting measurement accuracy. Store the gage in a protective case away from moisture and temperature extremes to preserve its tolerance integrity. Do not force the gage into a bore; resistance indicates the hole is undersize and requires further machining.