Spi 29-349-8 Class Zz Plus Plug Gage 0.349 in Dia

Product Description

The SPI 29-349-8 is a Class ZZ Plus plug gage designed to verify bore and hole diameters to a nominal size of 0.349 inches. Built to Class ZZ Plus tolerance standards, this gage holds a tolerance of 0.0002 inches, making it suitable for go/no-go inspection of production parts where dimensional accuracy is critical. The steel construction provides durability and wear resistance for repeated use in a shop or quality-control environment. Machinists, toolmakers, and quality inspectors rely on this type of gage for fast, reliable in-process and final inspection checks.

This plug gage is intended for use in manufacturing, machine shop, and inspection environments where bore diameter verification is required. It is used to check holes and bores machined to a 0.349-inch nominal dimension. The gage is suited for both in-process inspection at the machine and final inspection at a quality-control station. Its compact size and single-end design make it easy to handle during high-volume inspection tasks.

Key Features

• Nominal measurement diameter of 0.349 inches for precise bore inspection
• Class ZZ Plus tolerance of 0.0002 inches for reliable go/no-go gauging
• Steel construction for wear resistance and long service life
• Compact form factor suits both bench inspection and in-process use
• Single-piece quantity allows for targeted replacement or addition to an existing gage set

Compatibility

Designed as a standard Class ZZ Plus plug gage for inspecting machined bores and holes with a nominal diameter of 0.349 inches in general manufacturing and quality-inspection applications.

Installation Notes

Plug gages are handled and used by machinists, toolmakers, and quality-control technicians — no power source or tool disassembly is required. Clean the gage and the bore being checked before use to prevent debris from affecting the reading. Handle with care to avoid drops or impacts, which can alter the gage surface and compromise accuracy. Periodic calibration against a certified reference standard is recommended to maintain traceability.