knuckle joint

grabcad

A "knucklejoint" refers to a type of hinge in which two pieces of material connect at an angle, similar to the joint between fingers or knuckles. This type of joint is commonly used in furniture and door construction, as well as in toys and other items that need to bend or pivot. It is also known as a "knuckle and socket" joint due to its design resembling a hand's knuckle and the socket it fits into.