Variable force spring that does not restricted to Hook's Law for compression springs that the load increases proportionally with stroke. According to your request, you can have a multi-load design. Here are some relations between load and stroke that can be used on specific occasion. The product range from 0.03~0.75mm in thickness and 1~50mm in width.

Constant torque spring is made by winding steel strip into coil. When springs are counter wound on to output drum from its natural type by a load, force to resist uncoiling will be occurred. However, if load disappears, a constant torque will be output from output drum at the same time. Therefore, it is called constant torque spring. Comparing it with traditional power spring, its advantages are following?To exert nearly constant torque during entire stroke. It has better performance than power spring in more revolution designs. All revolutions are almost useful revolutions. It’s high efficiency. The product range from 0.03~0.75mm in thickness and 1~50mm in width.