Spi 29-739-0 Class Zz Plus Plug Gage 0.739 in

Product Description

The SPI 29-739-0 is a Class ZZ Plus plug gage used to verify the inside diameter of precision-machined holes to a nominal size of 0.739 inches. It holds a tolerance of 0.0002 inches, making it suitable for go/no-go inspection work in production and quality-control environments. The gage is machined from steel for durability and dimensional stability during repeated use. Machinists, toolroom inspectors, and quality technicians use plug gages like this to confirm hole conformance without relying on variable measuring instruments.

This gage is appropriate for inspecting drilled, reamed, or bored holes in metal, plastic, or composite workpieces where the nominal diameter is 0.739 inches. It fits standard production inspection workflows in both job-shop and manufacturing-line settings. The Class ZZ Plus designation indicates it meets tighter-than-standard ZZ tolerancing, giving it broader utility across medium-precision inspection tasks.

Key Features

• Nominal diameter of 0.739 inches for direct hole inspection at that size
• Class ZZ Plus tolerance of 0.0002 inches for reliable go/no-go gauging
• Steel construction for wear resistance and long service life
• Single-piece unit requiring no setup or calibration before use
• Lightweight at 0.2 pounds for easy one-handed handling during inspection

Compatibility

Designed as a direct-use plug gage for any application requiring inspection of a 0.739-inch nominal inside diameter; compatible with standard gage handle sets that accept the corresponding shank size.

Installation Notes

Plug gages are handled and used by machinists, toolroom personnel, and quality inspectors rather than installed in a system. Clean the gage and the hole being checked before each use to prevent debris from affecting the reading. Do not force the gage into an undersized hole, as this can damage both the gage and the workpiece. Store the gage in a protective case away from other metal tools to prevent nicking the precision ground surface.