Spi 29-720-0 Class Zz Plus Plug Gage 0.72 Inch

Product Description

The SPI 29-720-0 is a Class ZZ Plus plug gage used to verify bore and hole diameters to a nominal size of 0.72 inches. It delivers a tolerance of 0.0002 inches, making it suitable for precision inspection work in machining, manufacturing, and quality-control environments. Constructed from steel, the gage maintains dimensional stability under repeated use. Machinists, quality technicians, and tool-and-die professionals use plug gages like this one as a fast, reliable go/no-go check during in-process or final inspection. The part weighs 0.2 pounds and ships as a single unit.

This plug gage is intended for applications where hole diameter conformance must be verified against tight tolerances. Class ZZ Plus gages are commonly used in production inspection of drilled, reamed, or bored holes in metal and other rigid materials. The 29-720-0 is well suited to job-shop and production-floor environments where consistent measurement repeatability is required across multiple operators or shifts.

Key Features

• Nominal diameter of 0.72 inches for direct bore verification
• Class ZZ Plus tolerance rating of 0.0002 inches for precision inspection
• Steel construction for dimensional stability and durability under repeated use
• Compact and lightweight at 0.2 pounds for easy handling
• Single-piece package for straightforward inventory and toolcrib management

Compatibility

Designed as an OEM-style fixed-limit plug gage for use in standard go/no-go inspection setups on bored or reamed holes with a nominal diameter of 0.72 inches.

Installation Notes

Plug gages are handled and applied by quality technicians or machinists and require no tools for use beyond proper gage-handling procedures. Keep the gage clean and lightly oiled when not in use to prevent corrosion and dimensional drift. Do not force the gage into an undersized bore, as this will damage the gage surface and compromise measurement accuracy. Store in a protective case away from temperature extremes to maintain calibration integrity.