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When a mechanism fails because a tiny spring loses its tension or snaps under repeated cycling, the cost is far more than the part itself. Engineers, repair technicians, and precision hobbyists who work with small mechanisms — from medical devices and optical instruments to electronic enclosures and miniature hinges — need torsion springs they can rely on. This listing offers torsion leg springs wound from 0.4 mm spring steel wire, letting you match the exact geometry your design demands.
Each spring is wound from hardened spring steel (typically 0.4 mm wire diameter) with an outer coil diameter ranging from 2 mm to 6 mm (approx. 0.079 in to 0.236 in) and coil counts of 3, 6, or 9 turns. Leg angles are available in 60°, 90°, 120°, and 180°, and each size is offered in both left-hand (linke Feder) and right-hand (Rechte Feder) winding directions.
Typical use cases include miniature hinge return mechanisms in consumer electronics, spring-loaded latch assemblies in precision enclosures, and restoring force elements in optical or medical instrument sub-assemblies — all applications where a compact, consistent torsion spring with a defined leg angle is critical to reliable operation.
| Wire Diameter | 0.4 mm (approx. 0.016 in) |
|---|---|
| Outer Diameter Range | 2 mm – 6 mm (approx. 0.079 in – 0.236 in) |
| Coil Count Options | 3, 6, or 9 coils |
| Leg Angle Options | 60°, 90°, 120°, 180° |
| Winding Direction | Left-hand (linke Feder) / Right-hand (Rechte Feder) |
| Material | Spring steel |
| Surface Finish | See variant options |
| Inner Diameter | See variant options (outer Ø minus 2× wire Ø) |
| Free Leg Length | See variant options |
| Operating Temperature | See variant options |
Measure the shaft or mandrel your spring will sit on. The spring's inner diameter (outer Ø minus twice the wire Ø, so outer Ø minus 0.8 mm) should be slightly larger than the shaft for a free fit, or slightly smaller if you need a press-fit preload. For example, a 3 mm outer Ø spring has an inner diameter of approximately 2.2 mm.
Winding direction determines which way the spring tightens when deflected. A left-hand (linke Feder) spring tightens when rotated counter-clockwise; a right-hand (Rechte Feder) spring tightens when rotated clockwise. Choosing the wrong direction causes the spring to unwind rather than store energy, so always match the winding direction to your mechanism's deflection direction.
The leg angle is the angle between the two straight legs of the spring in its free (unloaded) state. Select the angle that matches your mechanism's rest position. For example, a 90° spring is common for right-angle latch returns, while a 180° spring suits applications where both legs point in opposite directions. If your mechanism requires a specific preload, choose an angle slightly smaller than the installed angle so the spring is already under tension when assembled.
More coils generally mean more angular deflection capacity and lower spring rate (softer spring for the same wire and diameter). Fewer coils produce a stiffer spring with less total travel. Choose 3 coils for stiff, short-travel applications; 6 coils for a balanced medium-duty return; and 9 coils where you need a softer, longer-travel torsional force.
These springs are wound from spring steel, which offers good mechanical properties but limited inherent corrosion resistance. For humid or outdoor environments, consider applying a light coating of oil or grease after installation, or contact us to confirm whether a coated variant is available for your size.
Standard spring steel maintains its properties up to approximately 120°C (248°F). Above this range, the material may experience stress relaxation and reduced spring force over time. For elevated-temperature applications, please contact us to confirm suitability or discuss alternative materials.
Check three dimensions: (1) outer diameter vs. your housing bore, (2) inner diameter vs. your shaft diameter, and (3) the free leg angle vs. your mechanism's rest position. The variant selector shows wire Ø × outer Ø × coil count, leg angle, and winding direction — match all three to your design requirements. If you are unsure, contact us with your shaft diameter and required torque and we can advise.
