Your Reliable Constant Force Springs Manufacturer

The flexible, efficient, swift service to meet your needs

  • Customization from design to delivery.

  • Fast Prototypes within 3 Days.

  • Mounting & Assembly Service.

  • Competitive Price with high quality.

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Constant Force Springs

Constant force springs offer constant tension and retraction, they can generate uncoiling force after coiling, This feature makes them wildly used in applications requiring smooth retracting, counterbalancing, tensioning, etc.

Yongsheng produce constant force springs since 2002, we can supply design, manufacturing, mounting & assembly service, etc.

  • A wide range of stainless steel constant force springs.

  • Full Customization from drawing to final products.

  • Mass springs in-stock can greatly save your time and cost.

  • ISO9001 & ISO14001 certified facilities.

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Customize Your Constant Force Springs with Yongsheng’s tailored Service

YongSheng produces all kinds of stainless steel constant force springs(also called constant tension springs, thickness: 0.06-0.6mm, width: 2-55mm), includes heavy-duty constant force springs, constant torque springs, multi-layer laminated or multiply load assembly of constant force springs, etc. Custom your springs with our tailored service, and we will offer you high-quality constant force springs that help to promote the effectiveness of your product.

constant-force-spring2

Adjustable Constant Force Spring

Adjustable constant force spring is excellent for height adjusting or position movement, it is popular in home appliances like height-adjusting electric fans, monitors, up-down tables, and position movements like medical equipment, CT scanners.

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constant-force-extension-spring

Constant Force Extension Spring

constant force extension spring normally generates bigger tensile, its retracting function is wildly used in the retail industry, home appliance, medical, automobile, etc. YongSheng can supply single layer and multiple layer constant force springs.

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Heavy Duty Constant Force Spring

For the heavy-duty constant force spring, we often apply these 3 kinds of approaches. 1, Make it thicker. 2, Make it wider. 3, Laminated load assembly. Yongsheng can help to get heavier duty with limited room & No lifespan sacrificing based on your application.

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constant-torque-springs-assembly

Constant Force Springs Assembly/ Mounting Service

Yongsheng supplies mounting/ assembly service, we can finish your assembly task timely with our special assembly group, what we mount parts include wheel reels, cable reels, retractor, and motor brush.

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constant-force-coil-springs

Constant Force Coil Spring

YongSheng’s constant force coil spring is made of SUS301 stainless steel strip, we can produce a variety of constant force springs, the thickness covers 0.06-0.6mm, width covers 2-55mm. 15-22 days lead time is based on quantity.

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constant torque spring

Constant Force Torsion Spring

Constant force torsion spring also called constant torque spring, belongs to the constant force springs, but utilizes the torsion force of spring when it works, it is wildly in a cordless window shade, cable wheel, and so on.

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What Set Yongsheng Apart With Average Constant Force Spring Supplier in China

How Do We Fabricate The Constant Force Springs?

In YongSheng, quality is always in the core position, and works throughout the entire springs’ production process. Your constant force springs will go through all kinds of the testing & inspection before shipping to your hand.

From the beginning of your concept, our service has launched, the process from the pre-sales guide, R&D assistant, raw material confirmation to the IQC, trial production, kinds of testing, mass production and FQC, packaging, etc. We will always accompany you to boom this business.

constant force spirng production process

Yongsheng Constant Force Springs

YongSheng has been in the springs industry for over 18 years, we can supply full customized service for your variety of constant force springs, with high quality and affordable price.

If you want to find a supplier of constant force springs in China, YongSheng will be your preferred partner.

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If you want to find a constant force spring supplier in China, YongSheng will be your best choice.

YongSheng manufactures all kinds of flat coil springs like constant force springs, power springs, spiral torsion springs, variable force springs, constant torque springs.

No matter you are a wholesaler or company, you can pay all your attention to your own customers and have no worries with your spring products.

We can supply a one-stop solution service for you, from pre-sales guide, product design to raw material selection, manufacturing, testing, inspecting, packaging, shipping, etc. All key-point of the process can be sent to you via videos or reports.

Yongsheng also supplies mounting & assembly service for your constant force retractor or constant force spring motor, with our powerful in-house capability, which includes the mold-making shop, plastic injection, mounting & Assembly team. You can greatly save money and time on it.

With over 18 years of flat coil springs manufacturing experience, we can supply you with the best-customized service based on your industry, mounting & assembly service is available, contact YongSheng, and let us boom your business right now!

constant-force-springs
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constant-force-springs
Download E-catalogue
  • constant-force-spring
  • constant-force-spring2
  • constant-force-spring1

YongSheng’s constant force springs is made of 301SUS stainless steel strip, which belongs to high strength stainless steel. when it be shaped through the forming machine, it will be coiled and generate constant tension force to resist uncoiling.

The Advantage of Yongsheng Constant Force Springs:

  1. Complete testing process like salt spray testing, tension testing, fatigue testing and so on.
  2. Mass ready-made toolings in stock(For tail details), greatly save your time and cost.
  3. Special techniques like high-temperature baking and oil-soaking make our springs more lubricated and anti-rust.
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Constant Force Spring Mounting

There are two ways of mounting constant force springs, one is drum mounting, the spring is fixed to the axis, and when the tension is forced in the spring, the drum axis will be rotating with the spring.

Another mounting way is cavity mounting like the illustration below, normally, it will add some lubricating oil in it, which can decrease the friction during the operational process.

drum-mounting

drum mounting

cavity-mounting

cavity mounting

Constant Force Spring Design of Multiple Load

Constant force spring can provide tension force, we can get ideal tensile force across the different constant force spring designs of mounting.

Multiply load can supply stronger force, there are three types of multiply load ways as the illustration below, coiled in tandem, back to back parallel, multi-layer laminated load.

Multiply loaded constant force springs can supply stronger tension force in the same distance, it is usually applied in lifting, window balance, etc.

Tandem

Tandem

back-to-back-parallel

back to back parallel

multiply-load

multiply load

Constant Force Spring Mechanism

According to the mechanism of constant force spring, which normally provides tension, counterbalance, retrieving funcitons. We adopt these functions in our applications.

Different applications determine the different mounting and multiply load styles, you’d better inquiry our expert before putting it into practice.

Partner with professional manufacturing master know-how will make the work more fluently.

functionality-illustrate1

Constant Force Spring Applications

Constant force springs are wildly used in various fields, such as position-adjusting in the home appliance like monitor, electric fan, pushing in shelf pusher, position movement in medical tables. Constant force window balance spring is used in the cordless shades.

vertical-adjusting

Height Adjusting

electric-fan

Electric Fan

horizontal-moving

Horizontal Moving

shelf-pusher

Shelf Pusher

Stock Constant Force Springs in YongSheng, Favorable Price For You

Select your type of springs in below stock table, and you will get a favorable pricing

constant-force-springs-illustration

Constant force springs
Part NumberTWLForce at different stroke(kg)
Stroke dimension(mm)
+/-5%
Dimension
(mm)
1001502002503003504005006007008009001000CWNo.of HolesS/VA1D1/MFR
YSH0175CF0.17.51506.17.4514.1515.171.4/2.25
YSH0214CF0.21414011.6413.121.8602.065.12/
YSH02115CF0.211.511011.0812.4121.887.271.875.09/
YSH0212CF0.21216016.8918.222.1318.543.13.95/
YSH018CF0.181206.067.1413.0812.531.3//
YSH0213CF00.2131801.612.9914.7612.1101.51//
YSH0213CF0.2132501.161.1716.5818.5121.7710.252.025.15/
YSH01511CF0.15113780.810.810.860.8610.5813.7715.538.642.39/13
YSH01110CF0.11103000.380.380.389.5811.6115.1615.052.53/1.25
YSH0212CF120.2124201.41.51.5811.6615.7114.9311.31.58/12
YSH0114CF0.1144000.130.130.1416.9418.6814.712.82.65/1.25
YSH01110CF70.11104600.30.30.311.371412.9411.264.45/7
YSH0225CF0.2256002.052.112.252.3315.0319.8824.3611.444.088.25/
YSH01612CF0.161254011.051.081.0911.2415.6214.9310.711.67/11
YSH01595CF0.159.55550.550.550.580.5811.6215.5313.2320.253.06//
YSH0225CF100.2257001.962.032.062.092.1815.4520.4124.4540.016.610.56/
YSH015127CF0.1512.76400.750.770.780.830.8811.2115.8414.81136.3/13
YSH02127CF0.212.77651.041.081.111.21.241.2615.0520.8214.8617.546.45/12
YSH0220CF0.22010160.640.660.660.690.690.690.720.7324.4629.4114.9516.697.53/10.5
YSH01820CF0.182016800.440.440.480.480.480.50.50.50.50.5323.4630.723.0202.54.941

T: Thickness,  W: Width,  L: Length

Constant Force Springs
Product No.T(mm)W(mm)L(mm)Force at different stroke(kg)
Stroke dimension(mm) +/-5%
Dimension(mm)
100mm150mm200mm250mm300mm350mm400mm500mm600mm700mm800mm900mm1000mm∅C∅WNo.of Holes∅S/∅VA1D/EFR
YSH0175CF0.17.51506.17.4514.1515.171.4/2.25
YSH0214CF0.21414011.6413.121.8602.065.12/
YSH02115CF0.211.511011.0812.4121.887.271.875.09/
YSH0212CF0.21216016.8918.222.1318.543.13.95/
YSH018CF0.181206.067.1413.0812.531.3//
YSH0213CF00.2131801.612.9914.7612.1101.51//
YSH0213CF0.2132501.161.1716.5818.5121.7710.252.025.15/
YSH01511CF0.15113780.810.810.860.8610.5813.7715.538.642.39/13
YSH01110CF0.11103000.380.380.389.5811.6115.1615.052.53/1.25
YSH0212CF120.2124201.41.51.5811.6615.7114.9311.31.58/12
YSH0114CF0.1144000.130.130.1416.9418.6814.712.82.65/1.25
YSH01110CF70.11104600.30.30.311.371412.9411.264.45/7
YSH0225CF0.2256002.052.112.252.3315.0319.8824.3611.444.088.25/
YSH01612CF0.161254011.051.081.0911.2415.6214.9310.711.67/11
YSH01595CF0.159.55550.550.550.580.5811.6215.5313.2320.253.06//
YSH0225CF100.2257001.962.032.062.092.1815.4520.4124.4540.016.610.56/
YSH015127CF0.1512.76400.750.770.780.830.8811.2115.8414.81136.3/13
YSH02127CF0.212.77651.041.081.111.21.241.2615.0520.8214.8617.546.45/12
YSH0220CF0.22010160.640.660.660.690.690.690.720.7324.4629.4114.9516.697.53/10.5
YSH01820CF0.182016800.440.440.480.480.480.50.50.50.50.5323.4630.723.0202.54.941

Reduce Your Maintenance Cost With YongSheng Constant Force Springs

YongSheng can custom any types of constant force springs according to your requirement. Just give us your application or detailed size of the cavity or drum. We will help you cost down and rocket your business.

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FAQ

Normally, there are 2 ways of mounting a constant force spring as mentioned above, one is drum mounting, Another mounting way is cavity mounting.

How to choose one depending on your product, it involves many factors like load force, case room, width, thickness, length, the diameter of coil springs and so on.

You’d better inquiry our expert before deploying it, we will supply you the most suitable design based on our decade’s experience.

Want to know how does a constant force spring work, We must know the constant force spring mechanism first.

Constant force spring is made of flat stainless steel strip or carbon steel strip, it will be winded when through the springs forming machine, once the extort extension force in the terminal end, it will generate a counterbalance retractable effect.

People utilize this counterbalance retractable feature to the different applications, such as home appliances up and down function, auto facing in the front of shelf pusher.

For one constant force spring, We can use the equation to get the tension force of constant force spring directly, the equation is as below:

Tension Force =19400*thickness³*width/6.6/diameter²/1.2 (mm).

If apply the multiple loads, we need to get the summation of each spring’s tension force.

Example:  there are 3 constant force springs for retractable function, they are Spring1, Spring2, Spring3, the tension force is as below:

Spring1 Tension = 19400*thickness³*width/6.6/diameter²/1.2 (mm)

Spring2 Tension = 19400*thickness³*width/6.6/diameter²/1.2 (mm)

Spring3 Tension = 19400*thickness³*width/6.6/diameter²/1.2 (mm)

Tension Force = Spring1 Tension + Spring2 Tension + Spring3 Tension

First of all, we need to confirm the raw material, different material has a different making technique. Normally, we use the high yield stainless steel strip or carbon steel strip.

Secondly, different width of springs determines which springs forming machine we will use, there are many types of spring forming machines in YongSheng, usually we take the 35mm as the critical point, above it we will use the special large forming machine, if not, we will apply the normal size forming machines.

Thirdly, some special techniques are necessary during springs making like the oil-soaking and high-temperature baking, it will make the springs more lubricating and anti-rust.

All of the above, actually it is a very long way to make the springs by mass production, YongSheng can supply all kinds of flat coil springs with high quality & competitive prices.

Life-cycle of the springs depends on many factors, such as the spring’s thickness, width, raw materials, load force, work temperature, and so on.

Normally, the larger springs, bigger load force, higher work temperature will have a shorter life-cycle.

Yes, we can, Heavy-duty constant force spring usually is used in big equipment for retractable function.

YongSheng can produce various of big constant force spring with our special springs forming equipment, the width of heavy-duty springs is up to 50mm, thickness up to 0.6mm, Our springs products go through a complete testing process before shipment, different environment and application will have the different requirements, inquiry our expert with your application right now!

heavy duty constant force springbig constant force spring

Constant load spring means it has a constant load force, with this feature, sometimes we also called it constant force spring.

In other filed, we also called some kind steel flat spring as the constant load spring, coz it generates the constant load, like the loaded truck filed.

YongSheng can produces small constant force springs, the minimum dimension of width is up to 1.5mm, the minimum dimension of thickness is up to 0.06mm.

Normally, We use the small constant force springs based on the limited room, and the small constant force springs will have less tension than large. Therefore, we can use the laminated mounting or multiple loads of assembly to get bigger tension.

large constant force springs are similar to the heavy-duty constant force springs.

Yongsheng can manufacture all kinds of stainless steel large constant force springs. The maximum width dimension of large constant force spring is up to 50mm, the maximum thickness is up to 0.6mm.

Large constant force springs can generate bigger tension than small constant force springs, we increase the tension through laminate mounting or multiply load of assembly.

multiply-loadTandem back-to-back-parallel

Best Guide to Select Your Constant Force Springs

In the application of flat coiled springs, constant force springs take up a big portion, they are so normal in our life like electric fan, monitor, shelf pusher, and so on.

constant-force-spring-application

How to select appropriate constant force springs is a bit difficult for us, even for some professional staff.

And now, this guide will teach you detailedly, let’s dive in.

Firstly, make sure your application, the different application has different demands for strength, voyage, function.

For instance, the monitor springs have these special features, such as short voyage, strong strength, and small housing room.

Therefore, we need to consider these from the beginning, like the thickness and length of 301 SUS stainless steel strip, the multiply load method, the cavity mounting.

Secondly, it’s better to make sure the method of constant force springs mounting at the early stage of the deal, this will save you a lot of time.

drum-mounting      cavity-mounting

As mentioned before, there are two methods of mounting, drum mounting, and cavity mounting, which method be applied depends on the construction of your application.

The method of mounting will decide the diameter of your constant force springs, which will directly affect the processing technique.

Based on the construction and rich experience, we recommend you to chose the cavity mounting in the monitor application.

Thirdly, the last certainly doesn’t mean the least.

If the clients can supply the demands of strength and length of springs, it will be appreciated.

The strength will decide the multiply load, and the length may decide the cavity room or drum size.

constant-force-spring's-diagram

All in all, if you are a rookie, and want to purchase some constant force springs, you’d better tell your supplier the above information as detailed as possible, this will maximumly decrease your time in the later.

Meanwhile, if you are proficient, you can just directly ask for your demands or provide your design drawing.

Sample always be the best choice, if you can supply a spring sample, that will be very appreciated.

YongSheng has professional measuring equipment and can measure its length, width, thickness, force tension, torsion, material, and so on.

with over 18 years of experience and thousands of solutions worldwide, YongSheng will always be your best partner in flat coiled springs.