What is a key factor that determines the minimum space between rivets?

A key factor that determines the minimum space between rivets is the diameter of the rivets. The spacing must account for the rivet's diameter to ensure adequate shear strength and to avoid issues such as material weakening or splitting. When rivets are placed too close together, the load on the surrounding metal is increased, which can lead to structural failure. Adequate spacing allows for the optimal distribution of stress over the material being joined, ensuring that the joint remains strong and durable. Each rivet requires a certain amount of material around it to maintain integrity and support the load, which is primarily influenced by its diameter.