Spi 29-526-1 Class Zz Plus Plug Gage 0.526 in

Product Description

The SPI 29-526-1 is a Class ZZ Plus plug gage used to verify the inside diameter of machined holes to a nominal size of 0.526 inches. It is manufactured from steel and 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 quality inspectors use plug gages like this one to confirm that bored, drilled, or reamed holes meet dimensional specifications before parts advance through a manufacturing process.

This gage is designed for use in machine shops, fabrication facilities, and inspection departments where hole diameter verification is part of standard workpiece acceptance criteria. It is well suited to both high-volume production inspection and low-volume precision work where tight tolerances must be confirmed quickly and reliably. The 0.526-inch nominal diameter targets a specific hole size that falls within the range commonly encountered in general metalworking and mechanical assembly applications.

Key Features

• Nominal measurement diameter of 0.526 inches for precise hole inspection
• Class ZZ Plus tolerance classification at 0.0002 inches for reliable go/no-go gauging
• Steel construction for durability and dimensional stability under repeated use
• Compact and lightweight at 0.2 pounds for easy handling during inspection
• Single-piece packaging supports individual unit procurement

Compatibility

Designed as a standard Class ZZ Plus plug gage for use with any go/no-go gage handle or holder that accepts the appropriate gage member diameter for 0.526-inch hole inspection.

Installation Notes

Plug gages are inspection instruments and do not require installation in the traditional sense; however, proper handling is essential to maintain accuracy. Always clean the gage and the workpiece bore before use to remove chips, coolant, and debris that could affect the reading. Do not force the gage into a hole — light hand pressure is the correct technique, and forcing can damage the gage or the part. Store the gage in a protective case away from temperature extremes to prevent thermal expansion effects on the steel.