Spi 29-632-7 Class Zz Plus Plug Gage 0.632 in Steel

Product Description

The SPI 29-632-7 is a Class ZZ Plus plug gage used to verify the internal diameter of drilled, reamed, or bored holes to a nominal size of 0.632 inches. Built from steel, this go/no-go style precision tool is held to a tolerance of 0.0002 inches, making it suitable for dimensional inspection in machining, manufacturing, and quality control environments. Machinists and metrology technicians use plug gages like this one to confirm bore conformance to drawing tolerances quickly and without complex setup. The Class ZZ designation reflects a standard precision grade appropriate for general-purpose inspection work.

This plug gage is used in shops and production environments where bore diameter verification is required during or after machining operations. It is well suited for inspection of through-holes and blind holes at the 0.632-inch nominal size. Typical applications include incoming inspection, in-process QC checks, and final part verification on turned, milled, or cast components. The compact form factor and lightweight construction at 0.2 pounds make it easy to handle on the shop floor or at an inspection bench.

Key Features

• Class ZZ Plus precision grade for general-purpose bore inspection
• 0.632-inch nominal measurement diameter
• 0.0002-inch tolerance for reliable dimensional verification
• Steel construction for durability in production environments
• Lightweight at 0.2 pounds for easy handheld use

Compatibility

Designed as an OEM-style replacement and standard inspection tool for any application requiring plug gage verification of a 0.632-inch nominal bore diameter to Class ZZ Plus tolerances.

Installation Notes

Plug gages are handled and used by machinists and quality control technicians and require no installation in the traditional sense. Before use, clean the gage and the bore being inspected to remove chips, coolant, and debris that could affect measurement accuracy. Do not force the gage into an undersized bore, as this can damage the gage land and compromise calibration. Store the gage in a protective case and verify calibration status before use in critical inspection applications.