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When a hinge sticks, a lid won't stay shut, or a mechanism loses its snap, the culprit is almost always a worn or incorrectly sized torsion spring. Engineers, repair technicians, and hands-on makers who need a reliable rotational force component — without ordering custom tooling — will find exactly what they need here. These torsion springs are wound from hardened spring steel wire and are available in a wide matrix of outer diameters, coil counts, leg angles, and winding directions so you can match the original part precisely.
Each spring is manufactured from 0.7 mm diameter spring steel (Federstahl) wire. Outer diameters span 3.5 mm to 9 mm (approximately 0.138 in to 0.354 in), with coil body lengths 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) windings are stocked.
Typical use cases include replacement torsion springs for small appliance lids and latches, precision instrument hinges requiring consistent return torque, DIY robotics and automation linkages needing compact rotational force, and clock or timer mechanism repair where exact coil geometry is critical.
Wound from hardened Federstahl (spring steel) wire for consistent elastic return and resistance to fatigue over repeated deflection cycles.
Wire diameter 0.7 mm, outer diameters from 3.5 mm to 9 mm (0.138"–0.354"), coil counts of 3, 6, or 9 — choose the exact geometry your application demands.
Available in 60°, 90°, 120°, and 180° leg configurations to match the rotational travel required by your mechanism without modification.
Both Linke Federn (left-hand) and Rechte Federn (right-hand) variants are stocked, ensuring correct torque direction for your assembly.
Precision winding maintains uniform coil pitch and leg geometry, delivering repeatable torque values across the full deflection range.
Stocked in a broad size range so repair technicians and makers can find a drop-in match for worn springs in appliances, instruments, and mechanical assemblies.
| Wire Diameter | 0.7 mm (0.028 in) |
|---|---|
| Outer Diameter (OD) | 3.5 mm – 9 mm (0.138 in – 0.354 in) — See variant options |
| Number of Coils | 3, 6, or 9 coils — See variant options |
| Leg Angle | 60°, 90°, 120°, or 180° — See variant options |
| Winding Direction | Left-hand (Linke Federn) / Right-hand (Rechte Federn) — See variant options |
| Material | Spring steel (Federstahl) |
| Surface Finish | Bare / natural spring steel |
| Inner Diameter (ID) | See variant options (OD minus 2× wire dia) |
| Free Torque | See variant options |
| Unit Sold | 1 piece per order |
Measure the bore or shaft your spring will wrap around. The spring's inner diameter (ID) should be slightly larger than the shaft diameter to allow free rotation. The ID is approximately equal to the outer diameter minus twice the wire diameter (ID ≈ OD − 2 × 0.7 mm). Select the OD variant whose resulting ID matches your shaft with a small clearance.
Winding direction determines which rotation tightens the spring. A left-hand (Linke Federn) spring tightens when rotated counter-clockwise; a right-hand (Rechte Federn) spring tightens when rotated clockwise. Match the winding direction to the rotation of your mechanism to ensure the spring loads correctly rather than unwinding.
The leg angle defines the angular position of the two spring legs relative to each other in the free (unloaded) state. Choose the angle that matches the travel your mechanism requires. For example, a 90° spring is common in hinges that need a quarter-turn return force, while 180° suits applications where the legs must be parallel in the free state. Measure the angle between the mounting legs on your original spring if replacing a worn part.
Torque output depends on wire diameter, outer diameter, number of coils, and deflection angle. With a 0.7 mm wire diameter, these are light-duty precision springs suited for small mechanisms such as instrument hinges, appliance latches, and compact automation linkages. For exact torque values, use a standard torsion spring torque formula (T = (E × d⁴ × θ) / (10.8 × D × N)) with your selected variant's dimensions, or contact us for engineering assistance.
These springs are made from bare spring steel (Federstahl) without a protective coating. Spring steel offers good mechanical properties but has limited corrosion resistance in humid or wet environments. For outdoor or high-humidity applications, consider applying a light oil or protective coating after installation, or contact us to discuss alternative material options.
More coils increase the spring's angular deflection capacity and reduce the torque rate (making the spring softer for a given deflection). Fewer coils produce a stiffer spring with higher torque per degree of rotation. Choose 3 coils for compact, stiff applications; 6 coils for a balanced medium-duty response; and 9 coils where a longer, more compliant spring body is needed or where greater angular travel is required.
Yes — the broad size matrix (OD 3.5–9 mm, 3/6/9 coils, 4 leg angles, 2 winding directions) is specifically designed to cover common replacement scenarios. Measure your original spring's wire diameter, outer diameter, coil count, leg angle, and winding direction, then select the matching variant. If your original spring's dimensions fall between listed sizes, choose the closest available option or contact us for guidance.
