Radial external legs
Torsion springs operate by twisting around their axis and store rotational energy, releasing torque when required.They are designed to provide controlled rotational force in various mechanical systems. Materials such as stainless steel, carbon steel, and alloy steel are available, with optional surface treatments to improve fatigue resistance and durability.
Applications:
door hinges, industrial machinery, automotive components, electrical switches, control systems, mechanical linkages, clips, counterbalance mechanisms, folding devices, agricultural equipment, and household appliances.
All dimensions are in mm
- Dt = Wire diameter
- Dy = Outer diameter
- Lo = Free length
- nv = No of active coils
- R = Rate
- Fo = Initial force in Newtons, required force before the spring starts to extend
- Ln = Permitted extended length for dynamic load
- Fn = Spring force in Newtons
- s = Deflection
Cylindrical wound torsion springs are used for axial loads,i.e. a circular movement. When loaded, the wire is exposed to a deflection. Normally, the inside body diameter is mounted on a shaft or similar. Mounting must be carried out in such a way that there is always play between the inner diameter and the shaft. See examples in the tables below.The load must be applied in such a way that the torque application binds the spring (see figure), as it is strongest in this direction. To minimise the friction agains the shaft, use of fixed tension ends is preferable.
Torsion springs have a linear spring characteristic, i. e. if a spring is turned 10° to provide torque of 1 Nmm, the same spring will provide a torque of 2 Nmm at 20° torsion.
Torque
Torque is equal to force x leg length:
M= F x A.The closer to the end of the leg the load is applied, the less counter force is created. The following tables specify torque in Nmm, i.e. the force obtained on the leg 1 mm from the centre.
Permitted load, life
If the maximum torque angle (p) as specified in the fol-lowing tables is used,a maximum of 10000 load cycles is permitted. If only 80% of the permitted torque angle is used, the lifespan of the spring increases to 200000–400 000 load oscillations. If only 70% of the permitted torque angle is being used, an almost infinite lifespan can be expected.
Design springs according to your exact performance requirements, adjust dimensions, select materials and operating conditions.
Types of Radial external legs
There are many types of Radial external legs
Tangential legsThese springs extend tangentially from the outer edge of the coil. They deliver a steady, controlled
Axial legsProject along the spring’s central axis, offering loading in tight spaces.
Radial external legsThese springs extend outward in a radial direction. They're a solid choice for strong mounting
Radial over-center legsThese legs move across the center of the spring as it works. This improves force balance and adds st
Inspection& Shipment
All springs are fully inspected for dimensional accuracy, mechanical performance, and surface quality before being stored. Only approved products are released to the warehouse and prepared for shipment following final order verification and packaging.
Serving Industries Worldwide
Apex Spring maintains a growing global presence and a deep understanding of international markets, enabling us to deliver tailored solutions for diverse regional requirements. With a strong focus on precision and quality, we work closely with our customers to provide reliable spring solutions that meet their specific needs, wherever their business operates around the world.
We also support global OEM and custom manufacturing projects, ensuring stable supply, consistent quality, and on-time delivery for customers across different industries and regions.
Serving Industries Worldwide
Apex Spring maintains a growing global presence and a deep understanding of international markets, enabling us to deliver tailored solutions for diverse regional requirements. With a strong focus on precision and quality, we work closely with our customers to provide reliable spring solutions that meet their specific needs, wherever their business operates around the world.
We also support global OEM and custom manufacturing projects, ensuring stable supply, consistent quality, and on-time delivery for customers across different industries and regions.
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