Spi 29-275-5 Class Zz Plus Plug Gage 0.275 Inch

Product Description

The SPI 29-275-5 is a Class ZZ Plus plug gage designed for precise inside-diameter inspection of bores, holes, and machined features. This go/no-go style precision tool checks a nominal diameter of 0.275 inches with a tolerance of 0.0002 inches, making it suitable for quality control and dimensional verification in machining, manufacturing, and toolroom environments. Constructed from steel for durability and dimensional stability, it is used by machinists, QC inspectors, and toolroom technicians who need reliable, repeatable measurement results on the shop floor or inspection bench.

Class ZZ Plus plug gages are commonly used in general-purpose inspection of drilled, reamed, or bored holes in both production and job-shop settings. This gage is appropriate for verifying inside dimensions on workpieces where dimensional accuracy is critical. It suits residential and commercial manufacturing environments requiring traceable, standards-compliant go/no-go gauging for small-diameter features.

Key Features

• Nominal measurement diameter of 0.275 inches for precise bore inspection
• Tolerance of 0.0002 inches meets Class ZZ Plus gauging standards
• Steel construction provides durability and long-term dimensional stability
• Compact and lightweight at 0.2 pounds for easy bench or in-process use
• Single-piece package quantity supports individual toolroom or QC stocking

Compatibility

Designed as a standard Class ZZ Plus plug gage for general-purpose inspection of 0.275-inch nominal inside diameters in machined components and bored features.

Installation Notes

Plug gages are handled and used by machinists and quality control inspectors — no power tools or electrical shutoff is required. Keep the gage clean and lightly oiled when not in use to prevent corrosion and maintain accuracy. Do not force the gage into a bore; gaging should rely on the weight of the tool and light hand pressure only. Store in a protective case away from temperature extremes to preserve dimensional integrity.