Spi 30-744-7 Radius Gage 0.5 Inch Convex Concave

Product Description

The SPI 30-744-7 is a single-leaf radius gage used to measure and verify curved surfaces in metalworking, fabrication, and maintenance applications. The leaf measures a 0.5-inch radius and is configured to check both convex and concave profiles without changing tools. Accuracy is rated at 0.0012 inches, making it suitable for close-tolerance fitting and inspection work. The leaf is finished in satin chrome over steel construction, which reduces glare during use and resists surface corrosion in shop environments. Machinists, pipefitters, and maintenance technicians keep radius gages like this on hand for quick profile checks during fitting and layout tasks.

This gage is appropriate for use in machine shops, fabrication facilities, and field maintenance settings where curved surfaces must be checked against a known radius. The convex and concave configuration on a single leaf covers both inside and outside radii of 0.5 inches. It is commonly used when fitting pipe ends, machined shoulders, fillets, and rounded profiles. The compact, lightweight design allows it to be carried in a tool pouch or stored in a gage roll without adding significant weight to a kit.

Key Features

• Measures 0.5-inch radius on both convex and concave surfaces with one leaf
• Accuracy of 0.0012 inches for close-tolerance inspection and verification
• Satin chrome finish reduces glare and resists corrosion in shop use
• Steel construction provides durability for repeated shop and field use
• Single-leaf format allows quick access and direct profile comparison

Compatibility

Designed as a standard single-leaf radius gage for use wherever a 0.5-inch convex or concave radius must be verified. Compatible with general layout and inspection tasks in metalworking, pipefitting, and fabrication.

Installation Notes

No installation is required for this inspection tool. Hold the gage leaf flat against the workpiece surface and check for light gap to verify radius conformance. Keep the leaf clean and free of burrs to maintain accuracy. Store in a protective case or roll to prevent damage to the measuring edge.