Spi 30-727-2 Radius Gage 1/8 Inch Convex Concave

Product Description

The SPI 30-727-2 is a single-leaf radius gage designed to measure both convex and concave radii at 1/8 inch (0.125 inch). The leaf is finished in satin chrome over steel, providing corrosion resistance and easy reading against machined surfaces. Accuracy is rated at 0.0012 inches, making it suitable for quality control and layout work on precision components. Machinists, toolmakers, and fabricators use this gage to quickly verify fillet and corner radii without the need for calipers or optical comparators. At 0.01 pounds, it is light enough to carry in a shop apron or tool pouch.

This radius gage is suited for job-shop machining, metal fabrication, and inspection environments where verifying small radii on workpieces, molds, dies, or weldments is a routine task. The convex and concave measurement capability on a single leaf eliminates the need to switch tools when checking both inside corners and outside radii on the same part. It is equally useful in maintenance, repair, and overhaul operations where matching replacement component profiles is required.

Key Features

• Measures both convex and concave radii at 1/8 inch on a single leaf
• Accuracy of 0.0012 inches for precision inspection work
• Satin chrome finish on steel construction for durability and surface contrast
• Maximum radius of 0.13 inches confirmed by specification
• Lightweight at 0.01 pounds for easy portability in the field or shop

Compatibility

Designed as a standard single-leaf radius gage for general machining and fabrication inspection applications. Confirm the required radius size matches the 1/8 inch specification before ordering.

Installation Notes

No installation is required for this gage. Clean the workpiece surface before use to ensure full contact with the leaf profile and an accurate reading. Store the leaf flat or in a protective case to prevent bending or edge damage that would affect measurement accuracy. Handle with care, as thin gage leaves can be distorted if used as a prying or scribing tool.