Spi 29-423-1 Class Zz Plus Plug Gage 0.423 in Dia

Product Description

The SPI 29-423-1 is a Class ZZ Plus plug gage used to inspect and verify bore diameters in precision machining and manufacturing environments. Designed to check a nominal diameter of 0.423 inches, this go/no-go style gage holds a tolerance of 0.0002 inches, making it suitable for applications where tight dimensional control is required. Constructed from steel, the 29-423-1 is built to withstand repeated use in shop environments. Machinists, quality inspectors, and tool-room technicians rely on plug gages like this one to confirm that drilled, reamed, or bored holes meet specification before parts move to the next stage of production.

The SPI 29-423-1 is used in machine shops, production facilities, and inspection departments wherever hole diameter verification is part of the quality process. It is suited for checking bores in metal components produced by drilling, reaming, or boring operations. The compact size and light weight of 0.2 pounds make it easy to handle at the workbench or on the shop floor. This gage is a standard single-piece unit packaged individually.

Key Features

• Nominal measurement diameter of 0.423 inches for precise bore inspection
• Class ZZ Plus tolerance of 0.0002 inches for reliable dimensional verification
• Steel construction for durability in shop and inspection environments
• Lightweight at 0.2 pounds for easy single-hand use
• Single-piece unit — no assembly required

Compatibility

Designed as a standard Class ZZ Plus plug gage for use in any application requiring bore diameter verification at 0.423 inches nominal diameter.

Installation Notes

Plug gages are typically handled by machinists or quality control inspectors and require no installation in the traditional sense. Before use, clean the gage and the bore being checked to remove chips, coolant, or debris that could affect measurement accuracy. Do not force the gage into a hole — excessive force can damage the gage or the workpiece and will produce unreliable readings. Store the gage in a protective case away from moisture to prevent corrosion and maintain calibration integrity.