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When a worn or undersized torsion spring causes your mechanism to bind, slip, or fail under load, finding the exact replacement geometry matters. Engineers, repair technicians, and hands-on DIYers who need a left-hand wound torsion spring in a compact diameter will find this pack covers a wide range of coil counts and leg angles in a single order.
Each pack contains 10 pieces of left-hand torsion springs manufactured from spring steel wire. Wire diameter is 0.7 mm (0.028 in), with outer diameter options ranging from 4 mm to 8 mm (approximately 0.16 in to 0.31 in). Coil counts span 3 to 9 coils, and leg angles are available in 60°, 90°, 120°, and 180°, allowing precise torque and deflection matching for your application.
Typical use cases include small appliance mechanisms requiring left-hand torsion springs, precision instrument assemblies needing compact 4–8 mm OD torsion springs, and hobby or robotics projects where a specific coil count and leg angle torsion spring is critical for consistent return force.
Made from spring steel wire for reliable elastic return and resistance to fatigue under repeated deflection cycles.
Wire dia 0.7 mm, OD 4–8 mm in 0.5 mm steps, coils 3–9, angles 60°/90°/120°/180° — select the exact combination you need.
Wound counterclockwise (left-hand) to generate torque when the spring is deflected in the correct direction for your assembly.
Each order ships 10 identical springs, giving you spares for prototyping, batch repairs, or multi-unit builds.
Choose 60°, 90°, 120°, or 180° leg angle to match the deflection geometry of your mechanism without bending or modifying legs.
Uniform coil pitch and wire diameter across the batch ensures repeatable torque characteristics when replacing multiple springs in the same assembly.
| Wire Diameter | 0.7 mm (0.028 in) |
|---|---|
| Outer Diameter (OD) | 4 mm – 8 mm (0.16 in – 0.31 in), in 0.5 mm steps |
| Number of Coils | 3 / 4 / 5 / 6 / 7 / 8 / 9 Coils (select variant) |
| Leg Angle | 60° / 90° / 120° / 180° (select variant) |
| Wind Direction | Left-hand (counterclockwise) |
| Material | Spring Steel |
| Surface Finish | See variant options |
| Quantity per Pack | 10 pieces |
| Inner Diameter (ID) | See variant options (OD − 2 × wire dia) |
| Free Angle | See variant options |
| Spring Rate | See variant options |
Measure the bore or housing your spring sits in, then select an OD that fits with a small clearance (typically 0.2–0.5 mm). If the spring wraps around a shaft, measure the shaft diameter and choose an inner diameter (ID = OD − 2 × wire dia) that gives a snug but free-sliding fit. For this spring: ID = OD − 1.4 mm.
Left-hand (LH) wound springs coil counterclockwise when viewed from the front. When the spring is deflected in the direction that tightens the coils, it generates torque. To confirm: hold the spring with the coil body facing you — if the wire winds away from you to the left, it is left-hand wound. Check your original spring or mechanism drawing before ordering.
More coils increase the spring's angular deflection capacity and reduce the spring rate (softer spring for the same wire and OD). Fewer coils produce a stiffer spring with less total travel. Match the coil count to your original spring or calculate based on the required torque and deflection angle for your mechanism.
The leg angle is the angle between the two straight legs of the spring in its free (unloaded) state. Choose the angle that matches your mechanism's geometry so the legs seat correctly against their stops without pre-stressing the spring beyond its design range. If replacing an existing spring, measure the free angle of the original.
Standard spring steel has moderate corrosion resistance. For outdoor, wet, or chemically exposed environments, consider applying a light coat of oil or grease, or look for stainless steel alternatives. These springs are best suited for indoor mechanical assemblies, instruments, and protected enclosures.
Yes. The 10-piece pack is ideal for prototyping and small-batch repairs. Because each variant is a specific combination of OD, coil count, and angle, you can order multiple variants to test fit and torque before committing to a final specification. For larger production quantities, contact us to confirm availability.
ID = OD − (2 × wire diameter). For this spring with 0.7 mm wire: ID = OD − 1.4 mm. For example, the 6 mm OD variant has an ID of approximately 4.6 mm. Use this to verify shaft clearance before ordering.
