Spi 29-212-8 Class Zz Plus Plug Gage 0.212 in Dia

Product Description

The SPI 29-212-8 is a Class ZZ Plus plug gage designed for precision hole measurement in manufacturing, inspection, and quality control environments. It measures bore diameters at exactly 0.212 inches with a tolerance of 0.0002 inches, meeting Class ZZ Plus standards for go/no-go dimensional verification. The gage is constructed from steel for durability and wear resistance. Machinists, tool-and-die makers, and quality inspectors use this type of gage to confirm that drilled, reamed, or bored holes fall within acceptable dimensional limits before parts move to the next stage of production.

This plug gage is suited for use in precision machining shops, fabrication facilities, and inspection departments where tight hole tolerances must be verified quickly and reliably. It is appropriate for checking through-holes and blind holes in metal components. The compact size and single-piece design make it easy to handle during high-volume inspection tasks or when verifying individual custom parts.

Key Features

• Measures bore diameter of 0.212 inches to Class ZZ Plus tolerance standards
• Tolerance of 0.0002 inches for reliable go/no-go verification
• Steel construction for wear resistance and dimensional stability
• Compact, single-piece form factor suited for bench and floor inspection
• Consistent with standard plug gage handling and inspection workflows

Compatibility

Designed as an OEM-style Class ZZ Plus plug gage for use in standard go/no-go inspection setups requiring a 0.212-inch nominal bore diameter measurement.

Installation Notes

Plug gages are handled by quality control technicians and machinists and do not require mechanical installation. Before use, clean the gage and the bore being checked to remove chips, oil, and debris that could affect measurement accuracy. Apply light gage oil when inserting the plug to reduce wear on both the gage and the workpiece. Store the gage in a protective case away from abrasive materials to preserve its tolerance class.