To join two sheets of .032 and .020 aluminum, which rivet should be selected?

Selecting the AN470AD 4-4 rivet for joining two sheets of .032 and .020 aluminum is appropriate due to its size and the specific requirements for joining materials of these thicknesses.

The AN470 series rivet is commonly used in aircraft structures, and the "4" in the rivet designation refers to the diameter of the rivet shank in 32nds of an inch, which equals 1/8 inch or approximately 0.125 inches in diameter. The last number in the designation represents the length of the rivet in 16ths of an inch. Therefore, a 4-4 rivet is 1/2 inch long, providing sufficient length to adequately join the specified aluminum sheets while allowing enough grip.

When joining aluminum sheets, the rivet size must account for the combined thickness of both sheets and ensure that there’s enough material for the rivet to hold effectively. The combined thickness of .032 and .020 aluminum is .052 inches. The AN470AD 4-4 offers the optimal grip range for this thickness without risking structural integrity, allowing for a proper flush fit and weight considerations as well.

Choosing a rivet that is too short may not provide a secure connection, while a riv