| Type |
Code |
Drawing |
End structure type |
Application |
| Cold coil compression spring（Y） |
Y I |
 |
Both ends shall be tightened and ground flat |
It is suitable for cold coil, with material diameter d ≥ 0.5mm, and is not suitable for springs for special purposes |
| n2=1～2.5 |
| Y Ⅱ |
 |
Both ends of the ring are tight and not worn |
The same as above. It is mostly used when the diameter of steel wire is small and the winding is large, and the stress of each circle is uneven |
| n 2=1.5～2 |
| Y Ⅲ |
 |
The two ends are not tight |
It is suitable for springs with cold winding and large winding, but less important.d ≥ 0.5mm |
| n 2=0～1 |
| Hot coil compression spring（RY） |
RY I |
 |
Both ends shall be tightened and ground flat |
Suitable for hot coil, not for special spring |
| n 2=1.5～2.5 |
| RY Ⅱ |
 |
Both ends shall be flattened and tightly ground or not ground |
|
| n 2=1.5～2.5 |
|
| Cold coil tension spring（L） |
L I |
 |
Semicircular shackle |
It is suitable for cold rolling, with material diameter D ≥ 0.5mm. The form of shackle depends on the assembly requirements. The common ones are semi-circular hook, circular hook and loop and pressure center of circular hook and loop. The stress at the bending part of the shackle is large and easy to break. It is generally used when the tension is small. |
| L Ⅱ |
 |
Round hook |
| L Ⅲ |
 |
Central Hook |
| L Ⅳ |
 |
Side Hook |
| L Ⅴ |
 |
Long arm semicircular hook |
| L Ⅵ |
 |
Long arm small round hook |
| L Ⅶ |
 |
Adjustable tension spring |
It is suitable for cold rolling. The material diameter D ≥ 5mm. It is generally used for springs with large stress and thick steel wire diameter, and the length can be adjusted |
| L Ⅷ |
 |
Drawbar Spring |
It is suitable for cold rolling. The spring does not bend the hook and loop, and the strength will not be weakened |
| Hot coil tension spring（RL） |
RL I |
 |
Semicircular hook |
Suitable for hot coil, not suitable for spring with special performance |
| RL Ⅱ |
 |
Round hook |
| RL Ⅲ |
 |
Central Hook |
| Torsion Spring（N） |
N I |
 |
Outer arm torsion spring |
The Wire diameter D ≥ 0.5mm. The form of End hooks depends on the assembly requirements. Applicable to cold rolled cylindrical torsion spring |
| N Ⅱ |
 |
Inner arm torsion spring |
| N Ⅲ |
 |
Center arm torsion spring |
| N Ⅳ |
 |
Parallel double torsion spring |
| N Ⅴ |
 |
Straight arm torsion spring |
| N Ⅵ |
 |
Single arm bending torsion spring |
