1 Scope
This European Standard specifies the calculation and design of cold and hot coiled
helical extension springs made from round wire and bar with values according to Table 1, loaded in the direction of the spring axis and op erating at normal ambient temperatures.
Table 1
|
Characteristic
|
Cold coiled extension spring
|
Hot coiled extension spring
|
|---|---|---|
| Wire or bar diameter | d ≤ 20 mm | d ≥10 mm |
| Number of active coils | n ≥ 3 | n ≥ 3 |
| Spring index | 4 ≤ w ≤ 20 | 4 ≤ w ≤ 12 |
NOTE In cases of substantially higher or lower working temperature, it is advisable to seek the manufacturer’s advice.