Spi 29-288-8 Class Zz Plus Plug Gage 0.288 in Dia

Product Description

The SPI 29-288-8 is a Class ZZ Plus plug gage designed to verify bore and hole diameters to a nominal size of 0.288 inches with a tolerance of 0.0002 inches. Plug gages of this class are used in precision inspection work to confirm whether a drilled, reamed, or bored feature meets dimensional acceptance criteria. The steel construction provides durability through repeated use in shop-floor and inspection-room environments. Machinists, toolmakers, and quality-control inspectors rely on Class ZZ Plus gages when verifying close-tolerance work where dimensional accuracy directly affects part fit and function.

This gage is suited for use in machine shops, manufacturing facilities, and inspection departments handling precision metal parts. It is applied wherever a go or no-go check on a 0.288-inch diameter feature is required. The Class ZZ Plus designation indicates a tolerance grade appropriate for inspection of production-grade workpieces. Individual unit packaging makes it straightforward to add to an existing gage set or replace a worn or damaged gage without purchasing a full set.

Key Features

• Nominal measurement diameter of 0.288 inches for direct bore verification
• Class ZZ Plus tolerance of 0.0002 inches supports close-tolerance inspection work
• Steel construction for wear resistance and dimensional stability under repeated use
• Single-piece packaging allows individual replacement without full-set purchase

Compatibility

Designed as a direct-fit plug gage for inspecting bored, drilled, or reamed features with a nominal diameter of 0.288 inches in standard precision inspection and quality-control applications.

Installation Notes

Plug gages are handled by machinists, toolmakers, and QC inspectors and require no power or mechanical installation. Ensure the gage and workpiece are at the same ambient temperature before measurement to avoid thermal expansion errors. Clean the gage and bore of debris or cutting fluid before use. Store in a protective case away from impact and corrosive environments to maintain calibration integrity.