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Why Choose US?

Custom Solutions Tailored to your exact load, space, and environmental needs
ISO 9001 Certified Rigorous quality control at every stage
Rapid Prototyping Tested samples available in 5-7 days
Global Supply Chain Reliable delivery across North America, Europe & Asia

Contact US

E-mail: sales@lihongsprings.com
Mobile: +86 176 6501 0974
WhatsApp: +86 150 1844 0213
FAX: +86 0769-8532 4238
Add: Room 101, Building 1, No. 446 Yanglang Road, Dalingshan, Dongguan, Guangdong, China

What is Constant Force Spring?

A constant force spring is a specially designed flat spiral spring that delivers near-constant force during extension. With force variation within ±5%, it's widely used in seat belts, medical devices and roller shades.Stainless Steel Compression Springs

Helical,clockwork,St···

Helical,clockwork,Stainless St···

Helical,clockwork,Stainless Steel Constant Force Spring

Helical,clockwork,Stainless St···

Helical,clockwork,Stainless Steel Constant Force Spring

Read more

Spiral,Pipe suspensi···

Spiral,Pipe suspension,Stainle···

Spiral,Pipe suspension,Stainless Steel Constant Force Spring

Spiral,Pipe suspension,Stainle···

Spiral,Pipe suspension,Stainless Steel Constant Force Spring

Read more

Constant Force Spring

A coiled spring delivering near-constant tension, used in tape measures and counterbalances.

Key Advantages

Constant Force

<±5% variation vs ±15-20% in conventional springs.

Long Stroke

Delivers up to 30m linear travel per spring.

Compact Storage

12mm min coiled diameter saves 90% space.

Quiet Operation

Special lubrication keeps noise <30dB.

Maintenance-Free

Stainless steel + self-lubricating design.

How They Work

As spring unwinds from spool, bending stress generates constant force; rewinds automatically when released.

Key Characteristics

✔️
Materials - 301/304 stainless standard, 17-7PH high-strength
✔️
Force Range - 0.1-50N customizable, 500N/m max load per width
✔️
Life Cycle - 50k cycles standard, 100k for medical grade

Key Design Factors

✔️
Radius Ratio – Spool diameter/thickness ratio 50-100:1
✔️
Stress Analysis – FEA confirms max stress <70% yield strength
✔️
Fatigue Test – 100k extension-retraction cycles for dynamic

Manufacturing Process

Slitting

Precision cutting to ±0.02mm width tolerance.

Edge Finishing

Laser deburring for Ra<0.4μm smoothness.

Pre-Stressing

Special rollers impart initial curvature.

Heat Treatment

350℃ vacuum annealing relieves stress.

Coating

Nickel/Teflon coatings reduce friction.

Testing

100% force curve and fatigue life verification.

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