Spi 29-570-9 Class Zz Plus Plug Gage 0.57 Inch

Product Description

The SPI 29-570-9 is a Class ZZ Plus plug gage used to verify the dimensional accuracy of drilled, reamed, or bored holes in production and inspection environments. Manufactured from steel, it checks a nominal diameter of 0.57 inches with a tolerance of 0.0002 inches, making it suitable for go/no-go inspection work where consistent hole sizing is critical. This type of gage is a standard tool in machine shops, manufacturing floors, and quality-control departments. It provides a direct, reliable method for confirming that a hole meets print specifications without the need for electronic measurement equipment.

Class ZZ Plus plug gages are used in general-purpose inspection applications where moderate precision is required. They are appropriate for checking holes produced by drilling, reaming, or boring operations across a wide range of industries including machining, fabrication, and assembly. The 0.57-inch diameter makes this gage suitable for medium-sized hole inspection in both prototype and production runs. Metrology technicians, machinists, and quality inspectors are the primary users of this type of gage.

Key Features

• Class ZZ Plus tolerance class for general-purpose hole inspection
• 0.57-inch nominal measurement diameter
• 0.0002-inch tolerance for consistent, repeatable results
• Steel construction for durability in shop environments
• Compact and lightweight at 0.2 pounds for easy hand use

Compatibility

Designed as a standard plug gage for go/no-go inspection of holes with a nominal diameter of 0.57 inches in general manufacturing and quality-control applications.

Installation Notes

Plug gages require no installation but should be handled and stored properly to maintain accuracy. Clean the gage and the hole being measured before use to prevent debris from affecting readings. Do not force the gage into an undersized hole, as this can damage the gage surface and compromise calibration. Periodic recalibration against certified reference standards is recommended to ensure continued measurement integrity.