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 Personalized Service
Constant force springs, also known as constant tension springs, generate constant tension force during operation.
At Yongsheng, we specialize in manufacturing a wide range of constant force springs to meet your versatile needs. Our springs are available in various thicknesses, ranging from 0.06mm to 0.6mm, and widths from 2mm to 55mm. We offer stainless steel and carbon steel materials to suit different requirements.
Yongsheng offers special processes for constant force springs to meet your higher force requirements.
Our capabilities include multi-layer laminated springs and multiple-load assembly. These techniques enable us to create custom solutions to meet your stronger tension requirements.
With our in-house tooling and plastic injection workshop, Yongsheng provides a streamlined production process. Not only the springs, but we also provide customized plastic parts that work with the springs, and the assembly and mounting services, ensuring a hassle-free experience for you.

Constant Force Springs Assembly/ Mounting Service
Yongsheng supplies mounting/ assembly service, we mount parts including wheel reels, cable reels, retractors, and motor brushes.
What Set Yongsheng Apart With Average Constant Force Spring Supplier in China
How Do We Assure The Quality of 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 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. Check the whole production process of constant force springs below. We will always be at your service and expect to help you 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 whether you are a wholesaler or a company, you can pay all your attention to your own customers and have no worries with your spring products.
We have the capability to provide a one-stop solution service for you, from a pre-sales guide to the final shipping, etc. All key-point of the process can be sent to you via videos and reports.
Yongsheng also supplies mounting & assembly service for your constant force retractor or constant force spring motor products, with our powerful in-house capability, including the mold-making shop, plastic injection, mounting & Assembly team. You can significantly save money and time on it.
with decades of experience in the industry, we know what you need, and what you are concerned about, tell us your spring specification or application, let us take care of your springs, and boom the business together, always at your service.
YongSheng’s constant force springs are made of 301SUS stainless steel strip, which belongs to the high-strength stainless steel with yield strength. when it is shaped through our special forming machine(developed in-house), it will be coiled and generate constant tension force to resist uncoiling.
The Advantage of Yongsheng Constant Force Springs:
- Complete testing processes 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 lubricating process make our springs more stable, anti-rust, and longer lifespan.
Constant Force Spring Mounting
There are two ways to mount constant force springs, one is drum mounting and the other one is cavity mounting.
For 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. The springs in shelf pushers use this mounting method.
For cavity mounting, like the illustration below, the spring is set in the cavity, and the whole operation is placed inside. This method wildly used in Gym equipment.
Normally, it needs to add some lubricating oil in it to decrease the friction during the operational process.
drum mounting
cavity mounting
Multiple Load Design For Constant Force Springs
Constant force springs can generate constant tension force, we can get stronger tensile force across the different designs of mounting as in the below illustration.
Normally, there are three ways to design multiply-load for constant force springs, they are coiled in tandem, back-to-back parallel, multi-layer laminated load.
Multiply loaded springs feature 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
Constant force springs are designed to generate a uniform tension force over a specific distance, which lies in its flat ribbon shape, the helically coiled ribbon strip can exert a near-constant force throughout its entire extension.
constant force springs feature equal extend and retract force, which makes them versatile for applications such as counterbalances, retractable cables, and much more.
Consult our expert with your application, and let’s make a customized application solution for you.


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 |
Reduce Your Maintenance Cost With YongSheng Constant Force Springs
Yongsheng uses high-quality stainless steel to produce constant force springs, which feature longer lifespans and stable performance. Just tell us your application or the detailed size of the cavity or drum. Let us customize springs for you and help you cost down. Always at your disposal.

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 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.