乃典型之弹簧，直筒型至各种变体乃至挂钩之各种型状均能依设计成型。各圈紧密圈绕其受力时
       拉长，各端绕一环圈 (loop) .
       The amout of initial tension can be varied and should be determined prior to spring
       production.

       必要資料如下(Mandatory data):
       1、控制直徑(Controlling Diameter)
       1、控制直徑 (Controlling Diameter)
       a、外徑 (outside Diameter,O.D.)
       b、內徑 (Inside Diameter,I.D.           
       2、線材尺寸，材料，及等級 (Wire size,material,and class)
       3、有效圈數 (Numbers of active coils)
       4、旋轉方向(左或右旋) Rotating Direction(Left or Right)
       5、自由長度(Free Length)
       6、荷重(Loading)
       7、尾端形式(Type of end )