1. Spring types: ordinary torsion springs, parallel double torsion springs, in-line double torsion springs; two types: no spacing and with spacing.

2. The effective working turns of general springs are not less than 3 turns;

3. The direction of rotation of the torsion spring must be clear, and the direction of rotation must be consistent with the direction of the torque, so that the spring is tightened when it is working.

4. The core shaft of the torsion spring must be 10% smaller than the inner diameter of the spring under the maximum working torque.

5. The radius of each excessive arc of the torsion arm part should not be less than 2 times the diameter of the material to avoid excessive stress concentration.

6. In order to prevent the torsion spring from instability during work, its maximum torsion angle shall not be greater than the allowable value

φallow=123.1*the 4th power of the effective number of turns in the free state.

7. The tempering temperature of torsion springs with higher precision requirements should not be too high;

8. For torsion springs that require electroplating, the curvature radius of the torsion arm should be as large as possible to prevent crispness.