Spi 29-581-6 Class Zz Plus Plug Gage 0.581 in Dia

Product Description

The SPI 29-581-6 is a Class ZZ Plus plug gage used to verify whether a bore or hole falls within acceptable dimensional tolerances. The gage measures a nominal diameter of 0.581 inches with a tolerance of 0.0002 inches, meeting Class ZZ Plus accuracy standards. It is constructed from steel for wear resistance and dimensional stability. Machinists, quality control technicians, and tool-and-die professionals use plug gages like this one during incoming inspection, in-process verification, and final part acceptance checks in manufacturing and fabrication environments.

This gage is suited for applications requiring precise hole-size verification at 0.581 inches nominal diameter. It fits into standard go/no-go gage workflows and is appropriate for use in job shops, production facilities, and tool rooms where bore tolerances must be confirmed to tight specifications. The 0.0002-inch tolerance makes it appropriate for moderate-to-high precision inspection tasks on steel, aluminum, and similar materials.

Key Features

• Class ZZ Plus accuracy with 0.0002-inch tolerance for reliable dimensional verification
• 0.581-inch nominal measurement diameter
• Steel construction for durability and dimensional stability under repeated use
• Compact and lightweight at 0.2 pounds for easy single-hand operation
• Compatible with standard plug gage handles and go/no-go inspection setups

Compatibility

Designed as an OEM-style replacement or direct-use plug gage for standard go/no-go bore inspection setups requiring a 0.581-inch nominal diameter at Class ZZ Plus tolerance.

Installation Notes

Plug gages are installed and used by machinists and quality control technicians. Before use, clean the gage and bore surfaces to remove debris, chips, and coolant residue that can affect measurement accuracy. Handle the gage with care to avoid dropping or impact damage, which can alter the precision ground surface. Store the gage in its protective case when not in use to prevent corrosion and surface damage.