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ball-and-socket joint
(redirected from Ball-and-socket joints)

   Also found in: Dictionary/thesaurus, Medical, Wikipedia, Hutchinson 0.07 sec.
ball-and-socket joint, in engineering, mechanical connection used between parts that must be allowed some relative angular motion in nearly all directions. As the name implies, the joint consists essentially of a spherical knob at the end of a shaft, with the knob fitting securely into a mating socket. Like other mechanical joints, a ball-and-socket joint must have some provision for lubrication and is normally provided with a seal to prevent loss of the lubricant. Joints of this type are commonly used in mounting the front wheels of automobiles, allowing these wheels movement sufficient for steering. In this application they are usually called ball joints.


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For example, RCAI vacuum forms polyethylene into universal wrist/thumb splints and shoe inserts; and nylon is used for hinges, support plates, and ball-and-socket joints.
The aye-aye's finger has ball-and-socket joints, like those found in your shoulders and hips, so it's able to bend in all directions.
 
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