Spi 29-575-8 Class Zz Plus Plug Gage 0.575 Inch

Product Description

The SPI 29-575-8 is a Class ZZ Plus plug gage designed to inspect and verify hole diameters to a nominal size of 0.575 inches. It holds a tolerance of 0.0002 inches, making it suitable for go/no-go inspection work in production and quality control environments. Constructed from steel, the gage provides the wear resistance and dimensional stability required for repetitive use on the shop floor. Licensed machinists, toolmakers, and quality technicians use Class ZZ gages for in-process inspection of drilled, reamed, or bored holes where maintaining consistent bore sizing is critical to part function.

This plug gage is used in machine shops, fabrication facilities, and manufacturing environments where bore diameter verification is part of standard quality assurance workflow. It is appropriate for inspecting ferrous and non-ferrous workpieces where a 0.575-inch nominal hole diameter must be confirmed within tight tolerance. The 0.0002-inch tolerance class positions this gage for inspection of medium-precision bores in general production work.

Key Features

• Nominal measurement diameter of 0.575 inches for direct bore verification
• Class ZZ Plus tolerance of 0.0002 inches for reliable go/no-go inspection
• Steel construction provides dimensional stability and wear resistance
• Compact, single-piece gage suited for hand-held shop-floor use
• Lightweight at 0.2 pounds for ease of handling during repeated checks

Compatibility

Designed as an OEM-style replacement and standard plug gage for use in any go/no-go inspection application requiring a 0.575-inch nominal bore check at Class ZZ Plus tolerance.

Installation Notes

Plug gages are used by machinists and quality control technicians and require no permanent installation. Before use, ensure the workpiece bore is clean and free of chips, burrs, or coolant residue that could affect the measurement reading. Handle the gage carefully to avoid dropping or scoring the precision ground surface, as any damage to the gage face will compromise measurement accuracy. Store the gage in its protective case or designated holder when not in use to prevent wear and corrosion.