Spi 19-988-5 Class Zz Minus Plug Pin Gage 0.988 in

Product Description

The SPI 19-988-5 is a Class ZZ minus plug pin gage with a 0.988-inch nominal diameter, manufactured from steel for durability in standard inspection applications. This go/no-go style gage is used to verify whether a drilled, reamed, or bored hole meets a specified minimum diameter tolerance. The minus designation indicates the gage is ground to the lower limit of the tolerance band. With a tolerance of 0.0002 inches, this gage is suited for general-purpose dimensional inspection where Class ZZ accuracy is the required standard. Machinists, quality technicians, and tool-and-die professionals rely on plug gages like this one for fast, repeatable hole verification without the need for complex measuring setups.

This gage is appropriate for use in machine shops, manufacturing facilities, and quality control environments. It fits into standard pin gage handles and is used to check holes in metal workpieces where nominal 0.988-inch diameter tolerances must be verified. Class ZZ gages are the most commonly used working gages for production inspection of holes machined to general commercial tolerances. The part is sold individually and requires no additional accessories beyond a compatible handle.

Key Features

• Class ZZ minus designation for lower-limit go-gage inspection of 0.988-inch diameter holes
• Tolerance of 0.0002 inches for general-purpose production inspection accuracy
• Steel construction for wear resistance and dimensional stability
• Compatible with standard plug gage handles used in most shop environments
• Sold as individual gage member for flexible kit building or direct replacement

Compatibility

Designed as an OEM-style replacement or supplemental gage member for standard plug gage handle sets used in general-purpose hole inspection of 0.988-inch nominal diameter bores.

Installation Notes

Plug pin gages are installed by hand into a compatible gage handle — no special tools are required for assembly. Before use, ensure the gage and workpiece surfaces are clean and free of chips, coolant, or burrs that could damage the gage or produce false readings. Do not force the gage into a hole; excessive force can damage both the gage and the workpiece surface. Store gages in a protective case or sleeve when not in use to prevent nicks and corrosion that would affect calibration.