Spi 29-622-8 Class Zz Plus Plug Gage 0.622 in

Product Description

The SPI 29-622-8 is a Class ZZ Plus plug gage designed for go/no-go inspection of cylindrical bores and holes at a nominal diameter of 0.622 inches. It holds a tolerance of 0.0002 inches, meeting the requirements of Class ZZ Plus precision measurement standards. The gage is constructed from steel for durability and wear resistance under repeated use. Machinists, quality control inspectors, and toolroom technicians use this type of gage to verify that drilled, reamed, or bored holes fall within specified dimensional limits before assembly or final inspection.

This plug gage is suited for use in production environments, job shops, and inspection departments where accurate bore verification is required. It is appropriate for light to medium production inspection tasks involving holes near the 0.622-inch nominal size. The steel construction makes it compatible with standard gage handling and storage practices. It is typically used alongside a ring gage or surface plate setup as part of a complete dimensional inspection routine.

Key Features

• Class ZZ Plus tolerance class for reliable go/no-go bore inspection
• 0.622-inch nominal measurement diameter
• 0.0002-inch tolerance for consistent dimensional verification
• Steel construction for durability and resistance to wear
• Compact and lightweight at 0.2 pounds for easy bench or handheld use

Compatibility

Designed as an OEM-style replacement or direct-use plug gage for inspecting cylindrical bores and holes at a 0.622-inch nominal diameter in accordance with Class ZZ Plus gage standards.

Installation Notes

Plug gages are used by machinists and quality inspectors and do not require power or mechanical installation. Ensure the workpiece is clean and free of burrs before gaging to avoid false readings or gage damage. Store the gage in a protective case away from moisture and abrasive surfaces to preserve the tolerance accuracy. Calibration and periodic inspection against a certified master are recommended per your facility quality plan.