Torsion Springs from China - Reliable Suppliers & Factory for Torque and Twisting Force Solutions
Torsion springs are commonly used in a variety of applications, such as in door hinges, garage doors, levers, and various types of machinery. They are also used in toys, clocks, and other consumer products where a rotating force is required. Sizes range from miniature, used in electronic devices, to large torsion springs used in chair control units. Torsion springs can be made of various materials, including steel, stainless steel, and other alloys, depending on the specific application requirements. They are valued for their ability to provide high torque and for their durability and long lifespan.
A torsion spring is normally close wound but can have a pitch to reduce friction between the coils. Torsion springs resist twisting or rotationally applied force. Depending on the application, a torsion spring can be designed to work in a clockwise or counterclockwise rotation, which will determine the direction of the wind.
There are many options for torsion spring leg configuration so the torsion spring can be attached in different ways. Leg specifications to consider for a torsion spring include leg angle, leg length, and leg style. Springs that are straight or parallel on the same side are considered to have a 0º leg angle and the increasing angle is in the unwinding direction.
Common torsion spring designs include straight torsion spring, straight offset torsion spring, hinged torsion spring, short hook end, and hook end designs. Torsion spring ends can be designed with custom bends, twists, hooked or looped end to suit your project needs.
SMS Spring stock torsion springs are offered in a choice of 90°, 120°, 180°, 210°, 270°, 300° and 360° free leg positions with straight legs. Custom double torsion springs consist of one set of coils coiled right hand and one set of coils coiled left hand. These coils are connected, usually with an unwound section between the winds and work in parallel. The sections are designed separately with the total torque being the sum of the two.
This twisting motion allows the torsion spring to generate high torque or rotational force, making it well-suited for applications where a rotating force is required, such as in door hinges, garage doors, and various types of machinery.
Another unique aspect of torsion springs is that their properties can be adjusted by varying their design parameters, such as wire diameter, outer diameter, and number of coils. This makes them highly customizable and versatile, allowing them to be tailored to meet the specific requirements of different applications.
Additionally, torsion springs are known for their high durability and long lifespan, due to their ability to withstand repeated twisting and untwisting without experiencing fatigue failure. This makes them a reliable and cost-effective choice for many industrial and consumer applications.
SMS Spring's have been carefully designed to represent the most commonly used specifications in both inch and metric sizes. Torsion springs are offered in a wide range of options and configurations and are available. Select from thousands of design options, leg angles, and leg lengths, plus left-hand and right-hand wound springs.
Torsion springs are offered in a variety of spring materials including music wire, stainless steel 302 and stainless steel 316. SMS Spring music wire springs include plating and stainless steel stock torsion springs, which are ideal for corrosion resistance, include passivation.
SMS Spring offers free plating, expert engineering assistance, live customer support service and much more. SMS Spring stock torsion springs are offered with legs of equal length oriented at varying unloaded angles.
90° Degree Torsion Spring
120° Degree Torsion Spring
180° Degree Torsion Spring
210° Degree Torsion Spring
270° Degree Torsion Spring
300° Degree Torsion Spring
360° Degree Torsion Spring
SMS Spring can manufacture custom torsion springs to meet your exact specifications for all your projects. We offer experienced engineering support from design through production. Select from an extensive selection of material and finish options that will be ideal for your torsion spring design application.
In addition, we can support your project with CAD assisted torsion spring design, governmental and industrial regulatory expertise, and prototypes through large production runs. SMS Spring offers advanced manufacturing capabilities and a wide variety of options for your torsion spring manufacturing needs such as:
- Advanced quality control systems
- Regulatory expertise including RoHS, REACH and DFARS
- CAD assisted product design
- In-house prototype production services
- Global supply chain network
Simply request a quote today or contact a SMS Spring Engineer for design assistance or to answer any questions to help start your custom spring project.
- Torsion spring loads should be specified at a fixed angular position and not at a fixed deflection from the free position.
- Torque spring testing is not easy to perform. Torque measurements for torsion springs can be taken, they may be inconsistent.
- Torsion spring inner diameter reduction and potential binding should be considered in your application.
- For torsion spring applications that require minimum hysteresis (load loss) torsion springs should be designed with space between adjacent coils to reduce frictional losses.
- A torsion spring should always be loaded in a direction that causes its body diameter to decrease. The residual forming stresses are favorable in this direction, but unfavorable when the spring is loaded in a direction that increases body diameter.
- Clearance must be maintained between the mandrel and the torsion spring at all times to prevent binding. The ideal mandrel size is equal to, or slightly less than, 90% of the inside diameter when the spring is fully deflected (minimum diameter). Mandrels significantly smaller than 90% should be avoided to prevent buckling during large deflections.
- Most torsion springs are close wound; therefore, the torsion spring body length will increase when a spring is deflected in the direction that will reduce the coil diameter. In tight housing designs, this increase should be considered.
- Torsion spring direction of wind must always be specified for a torsion spring.
- You can determine direction of wind of a torsion spring by simply holding it in your hand with your fingers placed around the outside of the body and your thumb pointing straight up. If the last coil ends in the same direction that your fingers are pointing, that is the hand (direction of wind) of the spring. The wind of the torsion spring can be right hand, left hand, or double torsion. Good design dictates that torsion springs should be used in the direction that winds the coil.
Torsion springs can be designed and manufactured in wide range of torsion spring end and leg configurations. Special torsion spring leg configurations are available on request. When designing torsion spring ends, it is important to consider that bends, loaded to decrease their radius of curvature, have favorable residual stresses. They can operate at higher applied stress levels than bends that increase the radius by loading. Frequently, torsion spring performance is limited because the sharply bent ends have greater stress than the body.
315 Degree
180 Degree
90 Degree
0 Degree
315 Degree
180 Degree
90 Degree
0 Degree
315 Degree
180 Degree
90 Degree
0 Degree
315 Degree
180 Degree
90 Degree
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Special types of torsion springs include double torsion springs and springs having a space between the coils to minimize friction. Double torsion springs consist of one set of coils coiled right hand and one set of coils coiled left hand. These coils are connected, usually with an unwound section between the winds and work in parallel. The sections are designed separately with the total torque being sum of the two.
