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When your mechanism demands a reliable, left-hand wound torsion spring that delivers consistent angular return force across a wide range of coil counts and outer diameters, finding the right spec in a single listing can be a challenge. Whether you are a mechanical engineer prototyping a new assembly, a maintenance technician replacing worn springs in industrial equipment, or a DIY builder sourcing hardware for a custom hinge or latch mechanism, this listing covers the full range you need.
Each pack contains 10 pieces of left-hand wound torsion springs manufactured from spring steel wire with a wire diameter of 1.2 mm (0.047 in). Outer diameters span from 6 mm (0.236 in) to 12 mm (0.472 in), and coil counts range from 3 to 9 coils. Available leg angles are 60°, 90°, 120°, and 180°, giving you precise control over the spring's working position and torque arm geometry.
Typical use cases include left-hand torsion spring replacement for cabinet hinges and door latches, custom spring selection for robotics and automation fixtures, and precision spring sourcing for clockwork mechanisms, medical devices, and small appliance assemblies requiring a specific OD-to-wire-diameter ratio.
Made from spring steel wire for reliable elastic memory, consistent return force, and resistance to fatigue under repeated cycling in mechanical assemblies.
Wire diameter fixed at 1.2 mm; outer diameters from 6 mm to 12 mm; coil counts from 3 to 9; leg angles of 60°, 90°, 120°, and 180° — select the exact combination for your design.
Left-hand wound coil body applies torque when rotated clockwise (viewed from the coil end). Confirm your mechanism's rotation direction before selecting.
Each order ships 10 identical springs per selected variant, providing spares for prototyping, testing, or batch replacement without over-ordering.
Four leg angle choices (60°, 90°, 120°, 180°) allow accurate torque arm positioning to match your assembly's geometry without bending or modifying the spring legs.
Uniform wire diameter and coil geometry across the batch ensures repeatable fit on mandrels and predictable spring rate for engineering and prototyping applications.
| Material | Spring Steel |
|---|---|
| Wire Diameter | 1.2 mm (0.047 in) |
| Outer Diameter (OD) | 6 mm – 12 mm (0.236 in – 0.472 in) — See variant options |
| Inner Diameter (ID) | OD − 2 × 1.2 mm = 3.6 mm – 9.6 mm (approx.) — See variant options |
| Number of Coils | 3 / 4 / 5 / 6 / 7 / 8 / 9 — See variant options |
| Leg Angle | 60° / 90° / 120° / 180° — See variant options |
| Wind Direction | Left-Hand (LH) |
| Finish | See variant options |
| Spring Rate | See variant options |
| Quantity per Pack | 10 pieces |
| Product Type | Torsion Spring |
The outer diameter (OD) should be selected based on the space available in your assembly and the required inner diameter (ID) to fit your mandrel or shaft. The ID equals OD minus twice the wire diameter (ID = OD − 2 × 1.2 mm). For example, a 10 mm OD spring has an approximate ID of 7.6 mm. Select the OD from the variant dropdown above and verify shaft clearance before ordering.
A left-hand wound torsion spring coils in the counterclockwise direction when viewed from the front (coil end). It applies torque when the coil body is rotated clockwise. If your mechanism's moving arm rotates clockwise to load the spring, a left-hand spring is correct. If the arm rotates counterclockwise to load, you need a right-hand spring. Check your existing spring's wind direction before ordering.
More coils generally result in a lower spring rate (softer spring) for the same wire diameter and OD, and allow greater angular deflection before reaching the elastic limit. Fewer coils produce a stiffer spring with less angular travel. Select the coil count that matches the torque and deflection requirements of your application. If replacing an existing spring, match the original coil count.
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 your assembly's geometry so the legs align with your mounting points without requiring modification. Common choices: 90° for right-angle brackets, 180° for inline or straight-arm applications, 60° or 120° for specific pivot geometries. If replacing a spring, measure the original leg angle.
These springs are made from spring steel, which provides good mechanical properties but has limited inherent corrosion resistance compared to stainless steel. For indoor or dry environments, spring steel is suitable. For humid, wet, or outdoor applications, consider applying a protective coating or lubricant, or contact us to confirm material suitability for your specific environment.
Spring steel torsion springs are generally suitable for temperatures up to approximately 120°C (248°F) without significant loss of spring properties. For applications above this range, a different alloy may be required. Contact us to confirm suitability if your operating temperature exceeds this threshold.
Spring rate depends on the wire diameter, outer diameter, number of coils, and material modulus. Because this listing covers a wide matrix of combinations, individual spring rate values are not listed here. If you require a specific spring rate for an engineering application, please contact us with your OD, coil count, and angle selection and we can provide further technical detail.
