Spi 29-456-1 Class Zz Plus Plug Gage 0.456 in Dia

Product Description

The SPI 29-456-1 is a Class ZZ Plus plug gage designed to verify inside diameter tolerances in precision machining and manufacturing environments. It measures a nominal bore diameter of 0.456 inches with a tolerance of 0.0002 inches, making it suited for go/no-go inspection workflows where tight dimensional control is required. Constructed from steel for durability and dimensional stability, this plug gage is a standard tool in quality control and inspection departments, as well as machine shops performing in-process checks on drilled, reamed, or bored holes.

This gage is used in industrial and manufacturing settings where bore diameter verification to Class ZZ Plus standards is required. It is appropriate for inspecting small-diameter holes in metal components and is commonly used by machinists, quality technicians, and tool room personnel performing dimensional inspection on production parts. The compact form factor and light weight of 0.2 pounds make it easy to handle at the workbench or on the shop floor.

Key Features

• Class ZZ Plus tolerance class for go/no-go bore diameter inspection
• Nominal measurement diameter of 0.456 inches
• Tolerance of 0.0002 inches for precise acceptance or rejection of bored features
• Steel construction for wear resistance and dimensional stability
• Lightweight at 0.2 pounds for easy bench or floor use

Compatibility

Designed as a standard Class ZZ Plus plug gage for verifying 0.456-inch nominal inside diameters in precision machining and inspection applications.

Installation Notes

Plug gages are used by quality control and machining personnel and do not require mechanical installation. Before use, clean the gage and the bore to be measured to remove chips, coolant, or debris that could affect readings. Handle with care to avoid drops or impacts that could alter the gage geometry. Store in a protective case away from temperature extremes to maintain calibration integrity.