What is the maximum rivet pitch, in relation to diameter?

The maximum rivet pitch refers to the maximum allowable distance between the centers of adjacent rivets in a riveted joint, which is typically expressed in relation to the diameter of the rivet used. The correct answer, 10D, indicates that the maximum rivet pitch should not exceed ten times the diameter of the rivet.

This guideline is based on engineering practices that ensure adequate strength and structural integrity of the joint. Having a pitch that is too large may lead to insufficient load transfer between rivets, reduced joint strength, and the potential for structural failure. Maintaining a maximum of 10D helps distribute loads evenly and minimizes stress concentrations that could compromise the joint.

Additionally, as the pitch increases beyond this recommended maximum, the risk of joint failure due to inadequate fastening increases significantly. Thus, designers and engineers adhere to this standard to ensure safety and reliability in aircraft structures.