What is the minimum radius required for the edges of handrails?

The minimum radius required for the edges of handrails is important for safety and comfort. A radius of 0.01 inch ensures that the edges are not sharp, which could present a hazard to users. This small radius allows for a gentle curve that helps prevent injury from any accidental contact with the edges of the handrail.

Handrails must be designed to be user-friendly, especially for individuals who might have limited dexterity or strength. A 0.01 inch radius is sufficient to mitigate the risk of cuts or scrapes while maintaining the structural integrity and aesthetic appeal of the handrail.

In contrast, the other options suggest larger radii, which while also providing a rounded edge, may not be the minimum requirement established in safety codes. These larger dimensions could be useful in specific applications but are not necessary to fulfill the basic safety requirement. Therefore, the smallest radius of 0.01 inch fulfills the essential criteria for safe handrail design.