Spi 29-259-9 Class Zz Plus Plug Gage 0.259 in Steel

Product Description

The SPI 29-259-9 is a Class ZZ Plus plug gage used to verify inside diameter dimensions to a nominal size of 0.259 inches with a tolerance of 0.0002 inches. Plug gages of this class are go/no-go inspection tools used in dimensional quality control to confirm whether a drilled, reamed, or bored hole falls within an acceptable size range. The 29-259-9 is constructed from steel for wear resistance and dimensional stability during repeated use. It is a standard tool for machinists, quality technicians, and tool and die professionals working to close-tolerance specifications.

This gage is suited for use in machine shops, manufacturing facilities, and precision fabrication environments where hole diameter verification is a routine part of the inspection process. Class ZZ Plus gages are intended for inspection of production parts and general-purpose gauging applications where consistent, reliable measurement of small-diameter holes is required.

Key Features

• Nominal measurement diameter of 0.259 inches for precise hole inspection
• Class ZZ Plus tolerance of 0.0002 inches for close-tolerance dimensional verification
• Steel construction provides durability and resistance to wear during repeated use
• Compact and lightweight at 0.2 pounds for easy handling at the inspection station
• Single-piece package quantity supports individual replacement or kit building

Compatibility

Designed as an OEM-style replacement and standard-use plug gage for go/no-go inspection of holes with a nominal diameter of 0.259 inches in general machining and production quality control applications.

Installation Notes

Plug gages are installed by hand into the hole being inspected and require no tools for use. Keep the gage clean and lightly oiled when not in use to prevent corrosion and maintain accuracy. Avoid dropping or striking the gage, as any impact can alter its diameter and invalidate measurements. Periodic recalibration against a traceable standard is recommended to confirm continued accuracy over the service life of the gage.