Spi 29-338-1 Class Zz Plus Plug Gage 0.338 in

Product Description

The SPI 29-338-1 is a Class ZZ Plus plug gage used to verify the inside diameter of holes to a nominal size of 0.338 inches. It is machined from steel and held to a tolerance of 0.0002 inches, making it suitable for go/no-go inspection work in production and quality-control environments. Machinists, toolroom technicians, and quality inspectors use plug gages like this one to confirm that drilled, reamed, or bored holes fall within specification before parts advance to the next stage of manufacturing or assembly.

Class ZZ Plus plug gages are intended for general-purpose inspection of medium-tolerance holes in production settings. This gage is appropriate for use on shop floors, inspection benches, and in incoming-quality inspection stations. It is well suited to verifying hole size in machined metal components across a range of industries including manufacturing, aerospace fabrication shops, and precision machining operations.

Key Features

• Nominal measurement diameter of 0.338 inches for direct go/no-go hole inspection
• Class ZZ Plus tolerance grade at 0.0002 inches for reliable production-level accuracy
• Steel construction for durability in shop and inspection environments
• Compact and lightweight at 0.2 pounds for easy handling at the point of inspection
• Individual unit packaging with a minimum order quantity of one

Compatibility

Designed as an OEM-style replacement or direct-use plug gage for general inspection of 0.338-inch nominal diameter holes in machined components where Class ZZ Plus accuracy is required.

Installation Notes

Plug gages are used by machinists and quality-control technicians and require no permanent installation. Before use, ensure the gage and workpiece are at the same ambient temperature to avoid thermal expansion error. Clean both the gage and the hole being checked with an appropriate solvent to remove chips, coolant, and debris. Never force a plug gage into a hole, as this can damage the gage surface and compromise measurement accuracy.