What is the minimum edge distance for a single row of protruding head rivets?

The minimum edge distance for a single row of protruding head rivets being not less than two rivet diameters is based on standard engineering practices to ensure sufficient strength and integrity of the riveted joint. This guideline helps prevent potential issues such as edge cracking or splitting, which can occur if the rivet is placed too close to the edge of the material. By maintaining a minimum distance of two rivet diameters, engineers ensure that the load is distributed adequately and that the material around the rivet has enough support to withstand the stresses it will encounter during operation.

This standard is widely accepted in aerospace engineering and other fields where rivets are used, ensuring safety and performance. The other options suggest larger minimum distances, which might be excessively conservative for standard applications. However, the two-rivet-diameter rule strikes a balance between safety and material efficiency.