What is the recommended drill bit size for a #3 rivet?

The recommended drill bit size for a #3 rivet is a #40 drill bit. This specific size ensures that the hole drilled in the material is appropriately sized to allow for proper insertion and gripping of the rivet. Using the correct drill bit size is crucial in aircraft metal structural repair because it impacts the effectiveness of the rivet in securing structural components.

The #40 drill bit creates a hole that is slightly smaller than the body of the #3 rivet, which facilitates a tight fit that helps to maintain the structural integrity of the joint once the rivet is driven in. If the hole is too large, the rivet may not hold effectively, potentially leading to structural failures under load.

Therefore, understanding the proper alignment of drill bit sizes with rivet specifications is vital for ensuring reliable assembly in aircraft maintenance and repair practices.