Coil springs

SANKYO-springs conform to ISO 10243 and JIS G3566. They demonstrate excellent high stress, high speed amplitude and heat-resistance characteristics.

Production

Safety is built into every SANKYO spring. Rigorous fatigue testing (360-500 cycles/minute) and stringent production controls assure excellent reliability.

Variants

The five types of SANKYO springs are:

  • lightest load
  • light load
  • medium load
  • heavy load
  • super load

Assortment

  1. Choose the spring-Ø and the value N of springs under consideration of your space.
  2. Determine the length of the loaded spring L2 and the travel Δf.
  3. Identify the unloaded length L0 from the list based on the loaded spring length L2 and the travel Δf.
    Calculate with these values the travel stroke f1 = L0 - L2 – Δf.
    The travel stroke f1 should be at least 5% of the unloaded length.
    Now you can choose your spring in accordance with your load and the corresponding spring rate R.
  4. Estimate your initial force F1.
  5. Calculate the spring rate R’ = F1 / (N x f1).
    If R slightly vary from R’, you can correct this with the preload. Otherwise you have to choose another spring type if there is a strong variation between R and R’ is bigger.

The spring needs a guidance if the ratio between length and diameter is bigger than 3,5.

Springs and plunger