Spi 29-726-7 Class Zz Plus Plug Gage 0.726 in

Product Description

The SPI 29-726-7 is a Class ZZ Plus plug gage designed to verify the dimensional accuracy of machined holes and bores. Built from steel, this go/no-go style gage checks whether a 0.726-inch diameter hole falls within acceptable tolerance limits. The Class ZZ designation indicates a commercial-grade tolerance of 0.0002 inches, making it suitable for production floor inspection and general quality control work. Machinists, tool-and-die makers, and QC inspectors use plug gages like this to confirm that drilled, reamed, or bored holes meet print specifications before parts move to the next operation.

This gage is suited for incoming inspection, in-process checks, and final inspection of machined components in manufacturing and job shop environments. It is most commonly used on CNC machined parts, castings, and fabricated assemblies where hole diameter is a critical dimension. The 0.726-inch size targets a specific bore that requires verification without the variability of a caliper or bore gauge reading. Its compact size and steel construction make it practical for repeated use on the production floor.

Key Features

• Class ZZ Plus grade with 0.0002-inch tolerance for reliable go/no-go hole inspection
• 0.726-inch measurement diameter for precise bore verification
• Steel construction for durability and dimensional stability under repeated use
• Compact, single-piece design suited for production floor and inspection room use
• Lightweight at 0.2 pounds for easy one-handed handling

Compatibility

Designed as a direct-use Class ZZ Plus plug gage for inspection of 0.726-inch diameter bores in machined parts across general manufacturing applications.

Installation Notes

Plug gages are handled and used by machinists, QC inspectors, and metrology technicians. Store the gage in its protective case when not in use to prevent burrs, nicks, or corrosion that can affect accuracy. Clean the gage and the bore being inspected before use to remove chips, oil, and debris that can cause false readings. Do not force the gage into an undersized hole, as this can damage the gage surface and compromise tolerance accuracy.