Swollen lug nuts — What causes lug nuts to swell and how to remove them What is an acorn lug nut? An acorn style lug nut protects against water intrusion into the threads. That feature, by itself is a great idea. But there are two ways to make an acorn style lug nut: 1) weld a steel cap over the end of the lug nut prior to chrome plating the entire lug nut, OR, 2) form a thin aluminum cap over the steel lug nut. The first method is more … Read More
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