Japanese


All types, materials and sizes are available

  • We have mass produced coil springs with spring index (D/d ) between 2.3 and 75.
    (The recommended range is 4 to 20.)
    Spring Index = Mean Diameter (D) / Wire Diameter (d)
    The spring index will determine the manufacturability of the spring.
    4 to 20 are considered as optimal in the index.


  • Manufacturing a smaller spring index:
    Too much stress is on tooling and you will run the risk of
    the spring buckling.


  • Manufacturing a larger spring index:
    Tolerances are greater and it is very difficult to manufacture.