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When a mechanism demands exact rotational force and reliable return motion, a poorly matched spring causes premature failure, misalignment, or inconsistent torque — frustrating for engineers, hobbyists, and repair technicians alike. These left-hand wound torsion springs are engineered for applications where directional winding matters, delivering consistent angular force across a wide range of coil counts and leg angles.
Each spring is manufactured from spring steel wire with a wire diameter of 0.5 mm (approx. 0.020 in). The outer diameter spans 3–6 mm (approx. 0.118–0.236 in), with coil counts from 3 to 9 and leg angles of 60°, 90°, 120°, or 180°. The left-hand winding direction ensures correct torque application in counter-clockwise loading scenarios.
Typical use cases include small appliance hinges requiring left-hand torsion spring replacement, precision instrument mechanisms needing a 0.5 mm wire torsion spring, and DIY clockwork or robotics projects calling for a compact coil spring with selectable leg angle.
| Wire Diameter (Draht Ø) | 0.5 mm (approx. 0.020 in) |
|---|---|
| Outer Diameter (Außen Ø) | 3 mm – 6 mm (approx. 0.118–0.236 in) |
| Number of Coils | 3 / 4 / 5 / 6 / 7 / 8 / 9 (see variant options) |
| Leg Angle (Winkel) | 60° / 90° / 120° / 180° (see variant options) |
| Winding Direction | Left-hand (counter-clockwise) |
| Material | Spring steel |
| Surface Finish | See variant options |
| Spring Rate | See variant options |
| Free Angle | See variant options |
| Application | Hinges, instruments, robotics, DIY mechanisms |
The outer diameter (OD) should be slightly smaller than the bore or housing it sits in, and larger than the shaft it wraps around. For a shaft, the inner diameter (ID = OD minus 2× wire diameter) must clear the shaft with a small gap. With a wire diameter of 0.5 mm, the ID ranges from approximately 2 mm (OD 3 mm) to 5 mm (OD 6 mm). Select the variant whose OD matches your housing clearance and whose ID fits your shaft.
Left-hand winding means the coils spiral counter-clockwise when viewed from the leg end. This is critical because a torsion spring tightens (winds up) when torque is applied in the direction of its winding. If you apply torque in the opposite direction, the spring unwinds and loses contact with the shaft. Always match the winding direction to your loading direction to ensure the spring functions correctly and does not slip.
More coils result in a lower spring rate (softer spring) and greater angular travel for the same torque. Fewer coils produce a stiffer spring with less angular deflection. For applications requiring a gentle return force over a wide angle, choose a higher coil count (7–9). For a firm, short-travel return, choose a lower coil count (3–4). The coil count also affects the overall body length of the spring.
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 assembly geometry so the legs contact their mounting points without pre-stressing the spring beyond its design range. Common choices: 90° for right-angle brackets, 180° for parallel-leg configurations, 60° or 120° for angled housings. If your required angle falls between options, choose the nearest available angle and adjust your mounting geometry slightly.
These springs are made from spring steel, which provides good mechanical properties but has limited corrosion resistance without additional surface treatment. For indoor or dry environments, they perform reliably over extended service life. For humid, wet, or outdoor applications, consider applying a light coating of machine oil or contact us to confirm whether a coated or stainless variant is available for your size.
Yes, provided the key dimensions match: wire diameter (0.5 mm), outer diameter, coil count, leg angle, and winding direction (left-hand). Measure your existing spring carefully before ordering. If the original spring has a different wire diameter or winding direction, it is not a direct replacement. Contact us if you need help matching specifications to your existing part.
A torsion spring (Torsionsfeder / Schenkelfeder / Drehfeder) stores energy through angular deflection — it resists twisting and returns to its free angle when released. A compression spring resists being compressed along its axis, and an extension spring resists being stretched. Torsion springs are used in hinges, latches, clothespins, and any mechanism that requires a rotational return force rather than a linear one.
