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When a mechanism fails because a spring loses its tension or snaps under repeated cycling, the root cause is often an undersized wire diameter or an imprecise leg angle. Engineers, hobbyists, and repair technicians who need a dependable rotational spring for hinges, latches, clips, and small mechanical assemblies will find this torsion spring series a direct solution.
Each spring is formed from 0.6 mm diameter spring steel wire (Federstahl) with an outer diameter (Außen Ø) ranging from 3 mm to 8 mm (approximately 0.12 in to 0.31 in) and a coil body length of 3, 6, or 9 coils. Leg angles are available in 60°, 90°, 120°, and 180°, and both left-hand (Linke Federn) and right-hand (Rechte Federn) wind directions are stocked. Each pack contains 10 pieces.
Typical use cases include small appliance lid hinges requiring a 90° return force, electronic enclosure latches needing a 180° torsion spring for snap-close action, and precision instrument clips where a 60° or 120° leg angle provides controlled pre-load torque. The compact 3–8 mm OD range suits miniature mechanisms where space is constrained.
| Wire Diameter (Draht Ø) | 0.6 mm |
|---|---|
| Outer Diameter (Außen Ø) | 3 mm – 8 mm (approx. 0.12 in – 0.31 in) |
| Inner Diameter (approx.) | 1.8 mm – 6.8 mm (OD − 2 × wire Ø) |
| Coil Count Options | 3 coils / 6 coils / 9 coils |
| Leg Angle Options | 60° / 90° / 120° / 180° |
| Wind Direction | Left-hand (Linke Federn) / Right-hand (Rechte Federn) |
| Material | Spring Steel (Federstahl) |
| Finish / Coating | See variant options |
| Pack Quantity | 10 pieces per pack |
| Spring Rate | See variant options |
| Max Operating Temperature | Contact us to confirm |
Measure the mandrel or shaft your spring will sit on. The spring's inner diameter (ID) must be slightly larger than the shaft diameter to allow free rotation. ID is calculated as OD − (2 × wire diameter). For this series: ID = selected OD − 1.2 mm. For example, a 5 mm OD spring has an ID of approximately 3.8 mm, suitable for shafts up to about 3.5 mm.
Wind direction determines which rotation tightens the coil. A left-hand (Linke Federn) spring tightens when rotated counter-clockwise; a right-hand (Rechte Federn) spring tightens when rotated clockwise. Choose the direction that matches your mechanism's loading rotation so the spring stores energy correctly rather than unwinding.
The leg angle is the pre-formed angle between the two straight legs of the spring. Select the angle that matches the geometry of your assembly at rest. A 90° spring is common for right-angle latches and hinges; 180° suits applications where both legs extend in opposite directions (e.g., clip-style closures); 60° and 120° are used where the mounting geometry requires a more acute or obtuse pre-load position.
More coils generally result in a lower spring rate (softer spring) and a longer body length. Fewer coils produce a stiffer spring in a shorter body. Choose 3 coils for compact, stiff applications; 6 coils for a balanced rate; and 9 coils where a softer, more progressive return force is needed or where body length is not a constraint.
Spring steel provides excellent mechanical properties — high tensile strength and good fatigue resistance — but has limited inherent corrosion resistance compared to stainless steel. For indoor or dry environments it performs reliably. For humid, wet, or chemically exposed environments, consider applying a protective coating or contact us to confirm suitability for your specific conditions.
Yes. Spring steel torsion springs are suited for both static pre-load applications (holding a position) and dynamic cycling applications (repeated open/close or rotation cycles). For high-cycle dynamic applications, ensure the deflection angle does not exceed the spring's elastic limit. If you need confirmation of cycle life for a specific deflection angle, contact us with your application details.
Use the three variant selectors above: first choose your wire Ø × Outer Ø × Coil combination (e.g., 0.6 × 5 × 6 Coil), then select your leg angle (60°, 90°, 120°, or 180°), and finally choose left-hand or right-hand wind. All combinations are stocked in 10-piece packs. If your exact specification is not listed, contact us for custom options.
