Spi 29-220-1 Class Zz Plus Plug Gage 0.22 Inch

Product Description

The SPI 29-220-1 is a Class ZZ Plus plug gage used to verify the inside diameter of machined holes and bores to a high degree of precision. Built from steel, it measures a nominal diameter of 0.22 inches with a tolerance of 0.0002 inches, making it suitable for go/no-go inspection in production or quality control environments. Plug gages of this class are standard toolroom instruments used by machinists, tool and die makers, and quality assurance technicians to confirm dimensional conformance on drilled, reamed, or bored features.

This gage is appropriate for use in manufacturing, fabrication, and inspection settings where tight hole tolerances must be verified quickly and repeatably. It is well-suited for incoming inspection, in-process checks, and final part verification. The compact size and simple design make it practical for bench use or point-of-manufacture deployment in both job shop and production floor environments.

Key Features

• Class ZZ Plus accuracy for precise hole inspection
• Nominal measurement diameter of 0.22 inches
• Tolerance of 0.0002 inches for reliable conformance checking
• Steel construction for durability and dimensional stability
• Compact and lightweight at 0.2 pounds for easy handling

Compatibility

Designed as an OEM-style inspection tool for use with standard plug gage handles and holders compatible with 0.22-inch diameter Class ZZ Plus gages. Verify handle compatibility with the gage diameter before assembly.

Installation Notes

Plug gages should be handled by qualified inspection personnel or machinists familiar with dimensional metrology practices. Clean the gage and the bore being measured before use to prevent contamination from affecting readings. Store the gage in a protective case away from heat sources to maintain dimensional stability. Do not force the gage into a bore; apply light, consistent hand pressure only.