Truck Nuts

thingiverse

Because truck nuts are hard to find and metal ones can be pricey, ranging from $100 to $400, I created my own set that connects via chain. Each nut measures 5.3 inches in diameter and 4.6 inches across the flats, giving you a clear size reference. The tread is designed for a standard 3-inch bolt with a 4-pitch thread. To connect these nuts, simply use an open-threaded chain connector, which can be found at most hardware stores.