While tie-rod ends have a taper, Heim joints are attached to steering linkages with straight bolts. The leverage exerted on the Heim joint can cause the bolt to wobble and loosen.

EMF Rod Ends & Steering Components has been making numerous EMF rod end designs (for various applications) for over 10 years now, ... What is the benefit with an adjustable joint?

Adjustable A-arms give you the flexibility of doing your suspension for different track setups. ... are available with high-strength rod ends and screw-in or bolt-in ball-joint plates.