Spi 29-750-7 Class Zz Plus Plug Gage 0.75 in Steel

Product Description

The SPI 29-750-7 is a Class ZZ Plus plug gage designed for precision dimensional inspection of cylindrical bores and holes. It measures a nominal diameter of 0.75 inches with a tolerance of 0.0002 inches, making it suitable for applications where tight dimensional control is required. Constructed from steel for durability and dimensional stability, this plug gage is a standard tool for machinists, quality control technicians, and toolroom personnel performing go/no-go or dimensional verification work on production and inspection floors.

Class ZZ plug gages are the most commonly used class for general-purpose inspection of holes and bores in manufacturing environments. This gage is appropriate for inspecting machined components, fixture holes, and production parts where verification of internal diameter is required. It is well-suited for both job shop and production facility use where consistent, repeatable measurement at the 0.75-inch nominal diameter is needed.

Key Features

• 0.75-inch nominal measurement diameter for inspecting standard-size bores and holes
• 0.0002-inch tolerance for precise dimensional verification
• Class ZZ Plus designation for general-purpose inspection applications
• Steel construction for wear resistance and long service life
• Compact and lightweight at 0.2 pounds for easy handheld use

Compatibility

Designed as an OEM-style replacement or standard-use plug gage for general-purpose bore and hole inspection at 0.75-inch nominal diameter in machining and quality control applications.

Installation Notes

Plug gages are typically used by machinists and quality control technicians without special tooling. Before use, ensure the gage and the workpiece bore are clean and free of chips, coolant, and debris to prevent false readings or gage damage. Do not force the gage into an undersized bore, as this can damage the gage surface and compromise calibration. Gages should be periodically recalibrated and stored properly to maintain accuracy.