Spring writing style:
Wire diameter* Outer (inner) diameter* Length* Number of turns,
such as: Φ0.5*Φ6.0*L10*8N
2. Tension spring:
Wire diameter* Outer (inner) diameter* Length* Number of turns* Number of looped link,
such as: Φ0.5*Φ6.0*L10*8N*2N
3. Torsion spring:
Wire diameter* Outer (inner) diameter*Angle*Length/Length*Number of turns,
such as: Φ0.5*Φ6.0*180°*L10/L10*8N