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The trailer hitch ball attaches to a ball mount; with a diameter typically 1 ⁄ 16 inch (1.6 mm) larger than the ball bolt/shank diameter. [2] The ball mount must match the SAE hitch class. [3] The ballmount for a receiver-type hitch is a square bar that fits into a receiver attached to the vehicle.
Patented originally in 1912, the lockrod was first used to secure railroad boxcar doors. Today, sometimes confused with locking bars or bar locks, lockrods have evolved to secure virtually every trailer or container that has a swing door (a door that swings open and closed rather than rolls up).
The key is normally unique to each set of nuts. Only one locking nut per wheel is normally used, so they are sold in sets of four. Most designs can be defeated using a hardened removal tool which uses a left-hand self-cutting thread to grip the locking nut, although more advanced designs have a spinning outer ring to frustrate such techniques.
The Checkpoint / Dustite / Dustite LR is attached to two adjacent wheel nuts in such a way that the respective indicator tips point towards each other. Should a lug nut become loose, the pointer will move in line with the movement of the lug nut, i.e. the tips no longer point to each other.
The benefit of spring lock washers lies in the trapezoidal shape of the washer. When compressed to loads near the proof strength of the bolt, it will twist and flatten. This reduces the spring rate of the bolted joint which allows it to maintain more force under the same vibration levels. This prevents loosening. [12]
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