Most lug nuts are one piece of hardened steel, but Ford chose a design that puts an aluminum cap over a steel core.
The cap is notorious for swelling and delaminating when it gets hot. It’s also a great place to trap moisture and encourage corrosion. The end result? A lug nut that’s either too big for a standard wrench or fused so tight you need a drill, welding torch, and 7 Hail Marys to remove it.
A 2017 class-action lawsuit accused Ford of cost-cutting when switching to the two-piece design. It also said the automaker is aware of the problems, but won’t honor its warranty by denying any lug nut related claims.…keep reading article "The Swollen Lug Nuts Lawsuit Against Ford Has Been Dismissed"