Constant Force Springs
Precision pre-stressed spiral strip springs engineered to deliver a virtually constant mechanical load throughout long extension travel without load decay.
Product Types & Configurations
Constant force springs are available in multiple mounting and winding styles tailored to specific spatial and torque requirements. Crafted from premium high-yield stainless steel or carbon music wire for superior elastic resilience and fatigue longevity.
Standard Constant Force Springs
The most widely specified spiral strip spring configuration, tightly wound onto a mounting spool or bushing to deliver uniform, smooth pull force throughout extended extension strokes.
Reverse-Wound Power Springs
Pre-stressed strip reverse-wound onto a secondary output drum to generate uniform rotational torque and energy storage in compact rotary drive assemblies.
Tandem & Laminated Constant Force Springs
Multiple strip springs mounted in parallel or back-to-back configurations to double load output, provide balanced bidirectional tension, or extend working deflection.
Technical Specification Range
Custom engineered to customer load, spool diameter, and life-cycle specifications.
| Parameter | Specification Range |
|---|---|
| Material Options | High-Yield 301 Stainless Steel, Music Wire (Carbon Steel) |
| Strip Thickness | 0.05 mm – 1.50 mm (0.002" – 0.060") |
| Strip Width | 3.0 mm – 50.0 mm (0.120" – 2.000") |
| Natural Outer Diameter | 6.0 mm – 200.0 mm |
| Constant Force Output | 0.1 N – 300.0 N (0.02 lbs – 67 lbs) |
| Maximum Stroke | Up to 5,000 mm (5 meters / 16.4 ft) |
| Cycle Life Expectancy | 4,000 to >50,000 cycles based on stress design ratio |
Typical Application Fields
Need Custom Constant Force Spring Engineering?
Provide your mounting drum diameter, required constant force (N or lbs), total extension stroke, and life cycle requirements. TOSTA engineers provide rapid calculation and rapid sample prototyping.