Spi 29-744-0 Class Zz Plus Plug Gage 0.744 in Dia

Product Description

The SPI 29-744-0 is a Class ZZ Plus plug gage designed to verify bore and hole diameters at a nominal size of 0.744 inches. It is used to perform go/no-go or dimensional inspection of machined holes to a tolerance of 0.0002 inches. The gage body is steel construction, providing the hardness and dimensional stability required for repeatable shop-floor and inspection-room use. Machinists, toolmakers, and quality control technicians use this type of gage to confirm that drilled, reamed, or bored holes fall within specified limits before parts advance to the next stage of production.

Class ZZ Plus plug gages are appropriate for general-purpose inspection of production parts where moderate tolerance requirements apply. This gage is suited for use in machine shops, manufacturing facilities, and metrology labs inspecting steel, aluminum, and similar workpiece materials. The 0.744-inch nominal diameter targets holes produced by standard reaming or precision boring operations in both prototype and high-volume production environments.

Key Features

• Nominal diameter of 0.744 inches for direct bore inspection at that size
• Class ZZ Plus tolerance of 0.0002 inches for general-purpose dimensional verification
• Steel construction provides hardness and wear resistance for repeated use
• Compact and lightweight at 0.2 pounds for easy single-hand operation
• Single-piece packaging suitable for individual replacement or kit supplementation

Compatibility

Designed as an OEM-style replacement or standard inspection tool for use wherever a 0.744-inch Class ZZ Plus plug gage is specified in a dimensional inspection process.

Installation Notes

Plug gages are installed and used by machinists or quality technicians and require no permanent installation. Before use, ensure the workpiece bore is clean and free of burrs, chips, or coolant residue that could affect the reading. Handle the gage carefully to avoid dropping, as impact damage can affect dimensional accuracy. Store the gage in a protective case away from abrasive materials to maintain calibration integrity.