Spi 29-875-2 Class Zz Plus Plug Gage 0.875 in

Product Description

The SPI 29-875-2 is a Class ZZ Plus plug gage designed for precision hole measurement in manufacturing, machining, and inspection applications. This go/no-go style gage checks bore diameters to a nominal size of 0.875 inches with a tolerance of 0.0002 inches, making it suitable for verifying tight-tolerance work on the shop floor or in a quality-control environment. Constructed from steel, the 29-875-2 is built to withstand repeated use in production settings. Dimensional inspectors, machinists, and metrology technicians rely on plug gages like this one to confirm that drilled, bored, or reamed holes fall within specified limits before parts move to the next stage of assembly.

Class ZZ Plus plug gages are used in general industrial inspection where moderate tolerance verification is required. The 0.875-inch nominal diameter suits a wide range of machined components, including housings, brackets, and mechanical assemblies where hole size directly affects fit and function. This gage is appropriate for both production-line spot checks and incoming material inspection in job shops, fabrication facilities, and manufacturing plants. Its compact size and single-piece steel construction make it easy to handle during high-volume inspection routines.

Key Features

• Nominal measurement diameter of 0.875 inches for precise bore verification
• Class ZZ Plus tolerance of 0.0002 inches for reliable go/no-go inspection
• Steel construction for durability and dimensional stability under repeated use
• Compact, single-piece design suited for production floor and lab environments
• Sold individually, ready to use out of the package

Compatibility

Designed as a direct-use plug gage for any application requiring verification of a 0.875-inch nominal bore diameter to Class ZZ Plus standards.

Installation Notes

Plug gages are used by dimensional inspection personnel and machinists, not installed in a system. Before use, clean the gage and the bore being measured to remove chips, coolant, and debris that could affect readings. Handle steel gages with clean gloves or a cloth to prevent corrosion from skin contact. Store the gage in its protective case when not in use to preserve its calibrated tolerance.