Spi 29-181-5 Class Zz Plus Plug Gage 0.181 in

Product Description

The SPI 29-181-5 is a Class ZZ Plus plug gage used to verify the diameter of machined holes to a nominal size of 0.181 inches. It holds a tolerance of 0.0002 inches, meeting Class ZZ Plus accuracy standards for go/no-go inspection work. Constructed from steel, this gage is built to resist wear over repeated measurements. Machinists, quality control inspectors, and tool and die professionals use plug gages like this one to confirm bore dimensions on production parts, ensuring holes fall within acceptable tolerances before assembly or further machining.

This plug gage is suited for inspection of drilled, reamed, or bored holes measuring 0.181 inches in diameter. It fits standard gage handle holders and is appropriate for use in job shop, production floor, and quality lab environments. The 0.0002-inch tolerance makes it a reliable choice for moderately precise work where dimensional verification is required before part acceptance. Individual packaging with a minimum order quantity of one makes it easy to stock as a single replacement or add to an existing gage set.

Key Features

• Class ZZ Plus accuracy rating with 0.0002-inch tolerance for consistent hole inspection
• Nominal measurement diameter of 0.181 inches for precise bore verification
• Steel construction for durability and wear resistance under repeated use
• Compatible with standard plug gage handle holders
• Single-piece packaging suitable for individual replacement or set supplementation

Compatibility

Designed as an OEM-style replacement or direct addition to existing plug gage sets requiring a 0.181-inch Class ZZ Plus gage member. Fits standard gage handles designed for small-diameter plug gage blanks.

Installation Notes

Plug gages are installed by quality control or machining professionals as part of go/no-go inspection routines. Ensure the gage and the workpiece bore are clean and free of chips or debris before gauging to avoid false readings or gage wear. Store the gage in a protective case away from other metal tools to prevent nicks or surface damage that could affect accuracy. Handle with care to avoid dropping, which can alter the gage geometry and invalidate measurements.