Spi 29-730-9 Class Zz Plus Plug Gage 0.73 Inch

Product Description

The SPI 29-730-9 is a Class ZZ Plus plug gage designed for precision bore and hole measurement in machining and inspection environments. Built to a nominal diameter of 0.73 inches with a tolerance of 0.0002 inches, this gage provides reliable go/no-go verification for tight-tolerance work. The steel construction delivers the hardness and wear resistance needed for repeated use on production floors and in quality control settings. Licensed machinists, metrology technicians, and quality inspectors are the primary users of this tool.

This plug gage is suited for verifying hole sizes in machined components across light manufacturing, toolroom work, and incoming inspection. It fits into standard gage handle assemblies and is used wherever consistent, repeatable bore verification is required. The Class ZZ Plus designation indicates this gage meets ANSI tolerance standards for workshop-grade inspection tools, making it appropriate for production-level checks rather than master or reference-grade applications.

Key Features

• Nominal measurement diameter of 0.73 inches for precise bore verification
• Tolerance of 0.0002 inches meets Class ZZ Plus ANSI standards
• Steel construction provides hardness and long service life under repeated use
• Compact and lightweight at 0.2 pounds for easy single-hand operation
• Compatible with standard plug gage handle assemblies

Compatibility

Designed as an OEM-style replacement or direct addition to standard plug gage handle sets used in workshop and production inspection applications.

Installation Notes

Plug gages are installed and used by machinists and quality control technicians. Before use, clean the gage and the bore being measured to remove chips, coolant, and debris that could affect readings. Handle the gage carefully to avoid dropping or striking, as impact damage can alter the calibrated diameter. Store in a protective case away from moisture to prevent corrosion of the steel construction.