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When a mechanism fails because the spring angle is off by a few degrees or the coil count doesn't match the torque requirement, the entire assembly suffers. Engineers, hobbyists, and repair technicians who work with hinges, latches, clamps, and small actuators need torsion springs they can spec precisely — not guess at. These left-hand torsion springs are designed for exactly that level of control.
Each pack contains 10 springs manufactured from spring steel wire with a diameter of 0.6mm (approximately 0.024 in). The outer diameter ranges across selectable variants from 4mm to 7mm (approximately 0.157 in to 0.276 in), with coil counts from 3 to 9 turns and leg angles of 60°, 90°, 120°, or 180°. The left-hand winding direction means the spring tightens when rotated counterclockwise — critical for correct torque orientation in your assembly.
Typical use cases include small hinge mechanisms on enclosures and lids, return-spring assemblies in latches and clasps, counterbalance springs in lightweight levers, and prototype or repair work on consumer electronics, toys, and precision instruments where a left-hand torsion spring with a specific coil count is required.
Made from spring steel wire for reliable elastic return force and resistance to fatigue over repeated deflection cycles.
Consistent 0.6mm wire cross-section across all variants ensures predictable torque characteristics and dimensional accuracy.
Left-hand coil orientation tightens under counterclockwise rotation — essential for correct torque direction in your mechanism.
Choose from 7 outer diameter sizes (4–7mm), 7 coil counts (3–9 turns), and 4 leg angles (60°, 90°, 120°, 180°) to match your exact spec.
Each order includes 10 identical springs — enough for prototyping, batch repairs, or keeping spares on hand for ongoing maintenance.
Suited for hinges, latches, clamps, levers, electronics, toys, and any small mechanism requiring a left-hand torsion return spring.
| Material | Spring Steel |
|---|---|
| Wire Diameter | 0.6 mm (approx. 0.024 in) |
| Outer Diameter | 4 mm – 7 mm (approx. 0.157 in – 0.276 in) — See variant options |
| Inner Diameter | See variant options (OD minus 2× wire dia) |
| Number of Coils | 3 – 9 Coils — See variant options |
| Leg Angle | 60° / 90° / 120° / 180° — See variant options |
| Wind Direction | Left-Hand (counterclockwise) |
| Quantity per Pack | 10 pcs |
| Finish | See variant options |
| Weight (per spring) | See variant options |
The outer diameter (OD) determines how the spring fits around a shaft or inside a bore. For shaft-mounted springs, the inner diameter (ID = OD minus twice the wire diameter) should be slightly larger than the shaft diameter to allow free rotation. For bore-mounted springs, the OD should be slightly smaller than the bore. Select your OD variant from the dropdown above based on your shaft or bore measurement.
More coils increase the spring's angular deflection range and reduce the torque rate (force per degree of rotation), making the spring softer for a given wire diameter. Fewer coils produce a stiffer spring with a higher torque rate. Choose a higher coil count if you need a gentler return force over a wider angle, or a lower coil count for a firmer, more compact spring.
The leg angle is the angle between the two straight legs of the torsion spring in its free (unloaded) state. Common options are 60°, 90°, 120°, and 180°. Choose the angle that matches the geometry of your mounting points when the spring is at rest. A 90° spring is common for right-angle hinge applications; 180° suits applications where both legs point in opposite directions.
A left-hand torsion spring tightens (stores energy) when rotated counterclockwise and unwinds when rotated clockwise. If your mechanism applies force in the clockwise direction, you need a right-hand spring instead. Using the wrong wind direction will cause the spring to unwind rather than store energy, resulting in no return force. Always confirm the rotation direction of your mechanism before selecting.
Spring steel offers good mechanical properties — high tensile strength and fatigue resistance — but has limited corrosion resistance compared to stainless steel. For indoor, dry, or low-humidity environments these springs perform reliably. For outdoor or high-moisture applications, consider applying a light protective coating or contact us to confirm suitability for your specific environment.
Spring steel maintains its mechanical properties well at room temperature and moderate heat. Sustained exposure to temperatures above approximately 120°C (250°F) can cause stress relaxation and reduce the spring's return force over time. For high-temperature applications, contact us to confirm compatibility before ordering.
Yes. The small wire diameter (0.6mm) and fine OD range (4–7mm) make these springs well-suited for compact mechanisms found in consumer electronics, precision instruments, toys, and small appliances. Verify the specific OD and coil count against your design tolerances before ordering.
