Spi 29-300-1 Class Zz Plus Plug Gage 0.3 Inch

Product Description

The SPI 29-300-1 is a Class ZZ Plus plug gage designed to verify the dimensional accuracy of machined holes and bores. Built for precision measurement work in manufacturing, machining, and quality control environments, it checks a nominal diameter of 0.3 inches with a tolerance of 0.0002 inches. Constructed from steel for durability and wear resistance, this gage is handled by machinists, quality technicians, and tool-and-die professionals who require reliable go/no-go or attribute-based inspection at the workpiece level.

This plug gage is suited for inspection of drilled, reamed, or bored holes in production and job-shop settings. Class ZZ Plus gages are typically used for medium-tolerance inspection work where dimensional conformance must be verified against established limits. At 0.3 inches diameter, this gage fits small-bore inspection applications common in precision part manufacturing and assembly operations.

Key Features

• Nominal measurement diameter of 0.3 inches for small-bore hole inspection
• Class ZZ Plus tolerance rating of 0.0002 inches for reliable attribute gauging
• Steel construction for resistance to wear and dimensional stability over time
• Compact and lightweight at 0.2 pounds for easy bench or in-process use

Compatibility

Designed as a direct-use Class ZZ Plus plug gage for verifying holes nominally sized at 0.3 inches in diameter across a range of machined components and materials.

Installation Notes

Plug gages are handled and used by machinists and quality control personnel and do not require installation in the traditional sense. Before use, clean the gage and the workpiece bore to remove chips, coolant, and debris that could affect measurement accuracy. Never force a plug gage into a bore; apply only light hand pressure to avoid damage to the gage or the part. Store the gage in its protective case and keep it away from temperature extremes to preserve dimensional integrity.