Spi 29-122-9 Class Zz Plus Plug Gage 0.122 in

Product Description

The SPI 29-122-9 is a Class ZZ Plus plug gage used to verify the diameter of drilled, reamed, or bored holes to a nominal size of 0.122 inches. Built from steel, it holds 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 metrology professionals use plug gages like this one to confirm that hole dimensions fall within acceptable limits before parts move to the next stage of assembly or shipment.

This gage is sized for small-bore inspection applications common in precision machining, toolmaking, and manufacturing quality control. The 0.122-inch diameter targets holes in the small end of the inch measurement range, where bore consistency is critical and caliper measurement alone may not provide sufficient accuracy. It is well suited for incoming inspection, in-process checks, and final verification on machined components.

Key Features

• Class ZZ Plus tolerance grade for general-purpose go/no-go hole inspection
• 0.0002-inch tolerance supports consistent dimensional verification
• Steel construction provides durability for repeated use in shop environments
• 0.122-inch nominal diameter targets small-bore hole applications
• Compact and lightweight at 0.2 pounds for easy bench or floor use

Compatibility

Designed as a general-purpose plug gage for inspecting holes with a nominal diameter of 0.122 inches in machined parts and assemblies across a range of manufacturing environments.

Installation Notes

Plug gages are handled and used by machinists or quality technicians and require no permanent installation. Clean the gage and the hole to be measured before use to prevent debris from affecting readings. Store the gage in a protective case when not in use to prevent damage to the precision-ground surface. Do not force the gage into an undersized hole, as this can damage the gage or the workpiece.