The Heim joint is a rod end bearing, refer to Figure LS7, that may be used on the end of control rods, steering links, tie rods, or anywhere a precision articulating joint is required.
They comprise a ball swivel with an opening through which a bolt or other attaching hardware may pass that is pressed into a circular casing with a threaded shaft attached. The threaded portion may be either male or female. Heim joints are made to a variety of standards in terms of strength and durability. Early versions were prone to failure and had a poor durability history. As a result Heim joints must only be used in critical applications such as steering and suspension if they meet all of the following criteria:
- The movement of the rod/component to which the joint is attached does not exceed the allowable articulation angle of the Heim joint as specified by the Heim joint manufacturer;
- The Heim joint does not hang-up on existing components; and
- A signatory confirms that the Heim joint has sufficient durability and strength in all directions for its intended purpose.
It is strongly recommended that Heim joints be protected by suitably designed dust covers to reduce the risk of premature wear.
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