What is the maximum edge distance recommended when attaching plates with rivets?

The maximum edge distance recommended when attaching plates with rivets is typically based on the diameter of the rivet itself, referred to as "D." In structural applications, the standard recommendation is to set this distance to a value that minimizes the risk of tearing or other structural issues.

Selecting an edge distance of four times the diameter (4D) ensures that there's adequate material left between the edge of the plate and the rivet hole, promoting better load distribution and reducing stress concentrations that could lead to failure. This distance is found to be a universal best practice in engineering standards, ensuring that the integrity and strength of the attachment will be maintained even under various load conditions.

Option 4D allows for sufficient margin to prevent edge tearing and ensures that the rivet has enough grip on the material, effectively transferring loads without compromising the materials' structural performance.

While the other options suggest smaller distances, they may not provide the same level of security and reliability in typical scenarios where rivets are employed in structural applications.