Spi 29-177-3 Class Zz Plus Plug Gage 0.177 Inch

Product Description

The SPI 29-177-3 is a Class ZZ Plus plug gage designed to verify bore and hole diameters to a nominal size of 0.177 inches with a tolerance of 0.0002 inches. Plug gages of this class are go/no-go inspection tools used to confirm that a machined hole falls within an acceptable dimensional range. The steel construction provides durability and dimensional stability under repeated use. This gage is typically handled by machinists, quality control inspectors, and toolroom technicians working in precision manufacturing and fabrication environments.

Class ZZ Plus plug gages are suited for inspection of production parts where tight dimensional control is required on small-diameter holes. They are commonly used in machine shops, fabrication facilities, and assembly lines to perform quick, reliable go/no-go checks without the need for measuring instruments. The 0.177 inch nominal diameter makes this gage appropriate for small-bore applications in aerospace, automotive, and general precision machining workflows.

Key Features

• Nominal diameter of 0.177 inches for small-bore hole inspection
• Class ZZ Plus tolerance of 0.0002 inches for precise go/no-go gauging
• Steel construction for dimensional stability and wear resistance
• Compact, single-unit design suited for bench or floor use
• Go/no-go format eliminates need for measurement instruments during inspection

Compatibility

Designed as a standard Class ZZ Plus plug gage for use in any application requiring go/no-go inspection of holes with a nominal diameter of 0.177 inches.

Installation Notes

Plug gages are handled by quality control technicians and machinists and require no installation in the traditional sense. Store the gage in a clean, dry environment and handle with care to avoid nicks or surface damage that could affect accuracy. Calibrate and inspect gages periodically per your facility quality management procedures. Always clean the gage and the bore being checked before use to prevent false readings caused by debris or burrs.