Spi 29-636-8 Class Zz Plus Plug Gage 0.636 in

Product Description

The SPI 29-636-8 is a Class ZZ Plus plug gage designed to check the inside diameter of holes to a nominal size of 0.636 inches. It holds a tolerance of 0.0002 inches, meeting Class ZZ Plus precision standards for go/no-go inspection work. Constructed from steel, this gage provides the dimensional stability required for reliable, repeatable measurement in a machine shop or manufacturing environment. Machinists, quality control technicians, and toolroom professionals use plug gages like this one to verify bore dimensions quickly without the setup time of variable gauging instruments.

This gage is suited for incoming inspection, in-process quality checks, and final part verification where a 0.636-inch nominal bore diameter must be confirmed. It is appropriate for use in both job shop and production floor environments. The compact, single-piece form makes it easy to incorporate into a standard gage crib or inspection kit. Applications include verification of drilled, reamed, or bored holes in metal, plastic, and composite workpieces.

Key Features

• Nominal diameter of 0.636 inches for direct go/no-go bore inspection
• Class ZZ Plus tolerance of 0.0002 inches for precise dimensional verification
• Steel construction provides wear resistance and dimensional stability
• Single-piece plug form allows fast, repeatable insertion checks
• Lightweight at 0.2 pounds, suitable for bench or handheld use

Compatibility

Designed as a standard Class ZZ Plus plug gage for verifying 0.636-inch nominal inside diameters in general machining and inspection applications.

Installation Notes

Plug gages are typically handled by machinists or quality technicians and require no power source or special mounting. Clean the gage and the bore to be checked before use to prevent debris from affecting the measurement result. Store the gage in a protective case away from other tooling to avoid surface damage that could affect accuracy. Calibration intervals should follow your facility's gage control program in accordance with applicable quality standards such as ISO 10012 or ANSI Z540.