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Strongest Springs in the World
Belleville Springs. Belleville springs, also known as disc springs or conical washers, are designed to provide high load capacity within limited space. 
Torsion Springs. Torsion springs are helical springs that work by twisting or torsion. ...
Extension Springs. 
Compression Springs.

What is a torsion spring?
A torsion spring is a type of mechanical spring that works by exerting torque or twisting force when it is twisted along its axis. The spring is made of wire that is wound in a spiral shape, with the ends of the wire attached to a stationary point on one end and a rotating point on the other end.

What metal are most springs made of?
Given the diversity of spring applications, it might be surprising to learn that springs are most commonly made from only six basic types of materials. These include: music wire, hard drawn MB, oil tempered wire, stainless steel, phosphor bronze, and brass.