Spi 29-221-9 Class Zz Plus Plug Gage 0.221 Inch

Product Description

The SPI 29-221-9 is a Class ZZ Plus plug gage used to verify bore diameter in precision machining and quality control applications. Measuring a nominal diameter of 0.221 inches with a tolerance of 0.0002 inches, this go-style gage provides a reliable pass or fail check for inside dimensions on drilled, reamed, or bored holes. Constructed from steel for dimensional stability and wear resistance, the 29-221-9 is a standard tool for machinists, toolmakers, and quality inspectors working to tight dimensional specifications on production floors and in inspection labs.

This gage is suited for light industrial and precision manufacturing environments where consistent bore verification is required. It is typically used during incoming inspection, in-process checks, or final part acceptance. The compact form factor and lightweight design make it easy to handle during high-volume inspection routines. Licensed metrology technicians and skilled machinists are the primary users of this type of instrument.

Key Features

• Nominal measurement diameter of 0.221 inches for precise bore checking
• Class ZZ Plus tolerance rating of 0.0002 inches for consistent accuracy
• Steel construction provides durability and dimensional stability under repeated use
• Lightweight at 0.2 pounds, suitable for frequent handling in inspection environments
• Go-gage design delivers fast pass or fail bore verification without measurement calculation

Compatibility

Designed as a standard Class ZZ Plus plug gage for use with any bore or hole nominally sized at 0.221 inches, compatible with general-purpose inspection fixtures and gage handles sized to accept this diameter range.

Installation Notes

Plug gages are handled and used by machinists, toolmakers, and quality control technicians. Always clean and deburr the bore before inserting the gage to avoid damage to the gage surface. Store the gage in a protective case away from other metal tools to prevent nicks or corrosion that could affect accuracy. Calibration should be verified periodically against a certified master reference in accordance with applicable quality system requirements.