Spi 29-647-5 Class Zz Plus Plug Gage 0.647 in

Product Description

The SPI 29-647-5 is a Class ZZ Plus plug gage machined to a nominal diameter of 0.647 inches with a tolerance of 0.0002 inches. Plug gages are go/no-go measurement tools used to verify that a drilled, reamed, or bored hole falls within an acceptable diameter range. This gage is constructed from steel, providing the dimensional stability required for repeated use in production and inspection environments. Machinists, quality control technicians, and tool-and-die professionals use Class ZZ Plus gages when consistent hole-size verification is required on the shop floor or in an inspection department.

This plug gage is suited for use in manufacturing, fabrication, and machine shop environments where hole diameter conformance must be verified against a known standard. It is appropriate for both incoming inspection and in-process quality checks on steel, aluminum, and other common workpiece materials. The 0.647-inch nominal size targets bore dimensions common in precision mechanical assemblies. Each unit is packaged individually and intended for single-gage deployment rather than a set configuration.

Key Features

• Nominal measurement diameter of 0.647 inches for targeted bore inspection
• Class ZZ Plus tolerance of 0.0002 inches ensures accurate go/no-go determination
• Steel construction provides durability and dimensional stability under repeated use
• Compact and lightweight at 0.2 pounds for easy handling during inspection
• Single-unit packaging supports individual gage replacement or supplemental tooling

Compatibility

Designed as an OEM-style replacement or supplemental gage for inspection setups requiring a Class ZZ Plus plug gage at 0.647 inches nominal diameter.

Installation Notes

Plug gages are typically deployed by machinists or quality technicians and require no installation in the traditional sense. Before use, ensure the gage and the workpiece bore are clean and free of chips, coolant residue, and burrs to prevent false readings or gage wear. Handle the gage with care to avoid dropping, as impact can alter the precision ground surface. Store the gage in a protective case or designated gage block when not in use to maintain calibration integrity.