Spi 29-841-4 Class Zz Plus Plug Gage 0.841 in Dia

Product Description

The SPI 29-841-4 is a Class ZZ Plus plug gage designed for go/no-go dimensional inspection of bored holes and machined openings. It measures to a nominal diameter of 0.841 inches with a tolerance of 0.0002 inches, making it appropriate for general-purpose inspection work where close but not master-grade accuracy is required. The steel construction provides durability through repeated use in shop and floor environments. Machinists, quality technicians, and tool-and-die professionals use this type of gage to verify that a machined feature falls within an acceptable dimensional range before a part moves to the next stage of production.

Class ZZ Plus plug gages are used in production and maintenance environments where standard-grade dimensional verification is needed. Typical applications include checking drilled, reamed, or bored holes in metal components, fixtures, and assemblies. This gage is suited for light-to-medium production inspection and is a common tool in machine shops, maintenance departments, and quality control stations working with steel and similar materials.

Key Features

• Nominal measurement diameter of 0.841 inches for direct hole inspection
• Tolerance of 0.0002 inches meets Class ZZ Plus accuracy requirements
• Steel construction resists wear through repeated gaging cycles
• Single-piece unit requires no additional components for standard use

Compatibility

Designed as a standard Class ZZ Plus plug gage for general-purpose dimensional inspection of machined holes at 0.841 inches nominal diameter.

Installation Notes

Plug gages are handled and stored by dimensional inspection personnel, not installed in a system. Clean the gage and the hole being checked before use to prevent debris from affecting the reading. Do not force the gage through a hole — excessive insertion force can damage both the gage and the workpiece. Store in a protective case away from temperature extremes to maintain dimensional stability.