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.
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.

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.

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.

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.
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.
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.
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!
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:
- Complete testing process like salt spray testing, tension testing, fatigue testing and so on.
- Mass ready-made toolings in stock(For tail details), greatly save your time and cost.
- Special techniques like high-temperature baking and oil-soaking make our springs more lubricated and anti-rust.
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
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
back to back parallel
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.


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.
Height Adjusting
Electric Fan
Horizontal Moving
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 | ||||||||||||||||||||||||
Part Number | T | W | L | Force at different stroke(kg) Stroke dimension(mm) +/-5% | Dimension (mm) | |||||||||||||||||||
100 | 150 | 200 | 250 | 300 | 350 | 400 | 500 | 600 | 700 | 800 | 900 | 1000 | ∅C | ∅W | No.of Holes | ∅S/∅V | A1 | D1/M | F | R | ||||
YSH0175CF | 0.1 | 7.5 | 150 | 6.1 | 7.45 | 1 | 4.15 | 15.17 | 1.4 | / | 2.25 | |||||||||||||
YSH0214CF | 0.2 | 14 | 140 | 11.64 | 13.1 | 2 | 1.86 | 0 | 2.06 | 5.12 | / | |||||||||||||
YSH02115CF | 0.2 | 11.5 | 110 | 11.08 | 12.41 | 2 | 1.88 | 7.27 | 1.87 | 5.09 | / | |||||||||||||
YSH0212CF | 0.2 | 12 | 160 | 16.89 | 18.2 | 2 | 2.13 | 18.54 | 3.1 | 3.95 | / | |||||||||||||
YSH018CF | 0.1 | 8 | 120 | 6.06 | 7.14 | 1 | 3.08 | 12.53 | 1.3 | / | / | |||||||||||||
YSH0213CF0 | 0.2 | 13 | 180 | 1.6 | 12.99 | 14.76 | 1 | 2.11 | 0 | 1.51 | / | / | ||||||||||||
YSH0213CF | 0.2 | 13 | 250 | 1.16 | 1.17 | 16.58 | 18.51 | 2 | 1.77 | 10.25 | 2.02 | 5.15 | / | |||||||||||
YSH01511CF | 0.15 | 11 | 378 | 0.81 | 0.81 | 0.86 | 0.86 | 10.58 | 13.77 | 1 | 5.53 | 8.64 | 2.39 | / | 13 | |||||||||
YSH01110CF | 0.11 | 10 | 300 | 0.38 | 0.38 | 0.38 | 9.58 | 11.61 | 1 | 5.16 | 15.05 | 2.53 | / | 1.25 | ||||||||||
YSH0212CF12 | 0.2 | 12 | 420 | 1.4 | 1.5 | 1.58 | 11.66 | 15.71 | 1 | 4.93 | 11.3 | 1.58 | / | 12 | ||||||||||
YSH0114CF | 0.1 | 14 | 400 | 0.13 | 0.13 | 0.14 | 16.94 | 18.68 | 1 | 4.7 | 12.8 | 2.65 | / | 1.25 | ||||||||||
YSH01110CF7 | 0.11 | 10 | 460 | 0.3 | 0.3 | 0.3 | 11.37 | 14 | 1 | 2.94 | 11.26 | 4.45 | / | 7 | ||||||||||
YSH0225CF | 0.2 | 25 | 600 | 2.05 | 2.11 | 2.25 | 2.33 | 15.03 | 19.88 | 2 | 4.36 | 11.44 | 4.08 | 8.25 | / | |||||||||
YSH01612CF | 0.16 | 12 | 540 | 1 | 1.05 | 1.08 | 1.09 | 11.24 | 15.62 | 1 | 4.93 | 10.71 | 1.67 | / | 11 | |||||||||
YSH01595CF | 0.15 | 9.5 | 555 | 0.55 | 0.55 | 0.58 | 0.58 | 11.62 | 15.53 | 1 | 3.23 | 20.25 | 3.06 | / | / | |||||||||
YSH0225CF10 | 0.2 | 25 | 700 | 1.96 | 2.03 | 2.06 | 2.09 | 2.18 | 15.45 | 20.41 | 2 | 4.45 | 40.01 | 6.6 | 10.56 | / | ||||||||
YSH015127CF | 0.15 | 12.7 | 640 | 0.75 | 0.77 | 0.78 | 0.83 | 0.88 | 11.21 | 15.84 | 1 | 4.81 | 13 | 6.3 | / | 13 | ||||||||
YSH02127CF | 0.2 | 12.7 | 765 | 1.04 | 1.08 | 1.11 | 1.2 | 1.24 | 1.26 | 15.05 | 20.82 | 1 | 4.86 | 17.54 | 6.45 | / | 12 | |||||||
YSH0220CF | 0.2 | 20 | 1016 | 0.64 | 0.66 | 0.66 | 0.69 | 0.69 | 0.69 | 0.72 | 0.73 | 24.46 | 29.41 | 1 | 4.95 | 16.69 | 7.53 | / | 10.5 | |||||
YSH01820CF | 0.18 | 20 | 1680 | 0.44 | 0.44 | 0.48 | 0.48 | 0.48 | 0.5 | 0.5 | 0.5 | 0.5 | 0.53 | 23.46 | 30.7 | 2 | 3.02 | 0 | 2.5 | 4.94 | 1 |
T: Thickness, W: Width, L: Length
Constant Force Springs | ||||||||||||||||||||||||
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Product No. | T(mm) | W(mm) | L(mm) | Force at different stroke(kg) Stroke dimension(mm) +/-5% | Dimension(mm) | |||||||||||||||||||
100mm | 150mm | 200mm | 250mm | 300mm | 350mm | 400mm | 500mm | 600mm | 700mm | 800mm | 900mm | 1000mm | ∅C | ∅W | No.of Holes | ∅S/∅V | A1 | D/E | F | R | ||||
YSH0175CF | 0.1 | 7.5 | 150 | 6.1 | 7.45 | 1 | 4.15 | 15.17 | 1.4 | / | 2.25 | |||||||||||||
YSH0214CF | 0.2 | 14 | 140 | 11.64 | 13.1 | 2 | 1.86 | 0 | 2.06 | 5.12 | / | |||||||||||||
YSH02115CF | 0.2 | 11.5 | 110 | 11.08 | 12.41 | 2 | 1.88 | 7.27 | 1.87 | 5.09 | / | |||||||||||||
YSH0212CF | 0.2 | 12 | 160 | 16.89 | 18.2 | 2 | 2.13 | 18.54 | 3.1 | 3.95 | / | |||||||||||||
YSH018CF | 0.1 | 8 | 120 | 6.06 | 7.14 | 1 | 3.08 | 12.53 | 1.3 | / | / | |||||||||||||
YSH0213CF0 | 0.2 | 13 | 180 | 1.6 | 12.99 | 14.76 | 1 | 2.11 | 0 | 1.51 | / | / | ||||||||||||
YSH0213CF | 0.2 | 13 | 250 | 1.16 | 1.17 | 16.58 | 18.51 | 2 | 1.77 | 10.25 | 2.02 | 5.15 | / | |||||||||||
YSH01511CF | 0.15 | 11 | 378 | 0.81 | 0.81 | 0.86 | 0.86 | 10.58 | 13.77 | 1 | 5.53 | 8.64 | 2.39 | / | 13 | |||||||||
YSH01110CF | 0.11 | 10 | 300 | 0.38 | 0.38 | 0.38 | 9.58 | 11.61 | 1 | 5.16 | 15.05 | 2.53 | / | 1.25 | ||||||||||
YSH0212CF12 | 0.2 | 12 | 420 | 1.4 | 1.5 | 1.58 | 11.66 | 15.71 | 1 | 4.93 | 11.3 | 1.58 | / | 12 | ||||||||||
YSH0114CF | 0.1 | 14 | 400 | 0.13 | 0.13 | 0.14 | 16.94 | 18.68 | 1 | 4.7 | 12.8 | 2.65 | / | 1.25 | ||||||||||
YSH01110CF7 | 0.11 | 10 | 460 | 0.3 | 0.3 | 0.3 | 11.37 | 14 | 1 | 2.94 | 11.26 | 4.45 | / | 7 | ||||||||||
YSH0225CF | 0.2 | 25 | 600 | 2.05 | 2.11 | 2.25 | 2.33 | 15.03 | 19.88 | 2 | 4.36 | 11.44 | 4.08 | 8.25 | / | |||||||||
YSH01612CF | 0.16 | 12 | 540 | 1 | 1.05 | 1.08 | 1.09 | 11.24 | 15.62 | 1 | 4.93 | 10.71 | 1.67 | / | 11 | |||||||||
YSH01595CF | 0.15 | 9.5 | 555 | 0.55 | 0.55 | 0.58 | 0.58 | 11.62 | 15.53 | 1 | 3.23 | 20.25 | 3.06 | / | / | |||||||||
YSH0225CF10 | 0.2 | 25 | 700 | 1.96 | 2.03 | 2.06 | 2.09 | 2.18 | 15.45 | 20.41 | 2 | 4.45 | 40.01 | 6.6 | 10.56 | / | ||||||||
YSH015127CF | 0.15 | 12.7 | 640 | 0.75 | 0.77 | 0.78 | 0.83 | 0.88 | 11.21 | 15.84 | 1 | 4.81 | 13 | 6.3 | / | 13 | ||||||||
YSH02127CF | 0.2 | 12.7 | 765 | 1.04 | 1.08 | 1.11 | 1.2 | 1.24 | 1.26 | 15.05 | 20.82 | 1 | 4.86 | 17.54 | 6.45 | / | 12 | |||||||
YSH0220CF | 0.2 | 20 | 1016 | 0.64 | 0.66 | 0.66 | 0.69 | 0.69 | 0.69 | 0.72 | 0.73 | 24.46 | 29.41 | 1 | 4.95 | 16.69 | 7.53 | / | 10.5 | |||||
YSH01820CF | 0.18 | 20 | 1680 | 0.44 | 0.44 | 0.48 | 0.48 | 0.48 | 0.5 | 0.5 | 0.5 | 0.5 | 0.53 | 23.46 | 30.7 | 2 | 3.02 | 0 | 2.5 | 4.94 | 1 |