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When a worn or undersized torsion spring causes a hinge to sag, a mechanism to bind, or a door to fail mid-cycle, finding the exact replacement geometry matters. These left-hand wound torsion springs are engineered for DIYers, maintenance technicians, and mechanical engineers who need a reliable, dimensionally consistent spring in a range of coil counts and leg angles — without ordering custom parts.
Each pack contains 10 springs made from spring steel wire with a diameter of 1.8 mm (0.071 in). Outer diameter options span 10 mm to 20 mm (0.39 in to 0.79 in), with coil counts from 3 to 9 and leg angles of 60°, 90°, 120°, or 180°. The left-hand wind direction means the spring tightens when rotated clockwise — the correct orientation for many standard mechanical assemblies.
Typical use cases include cabinet door hinges requiring controlled return force, small appliance mechanisms needing angular reset, automotive interior components with rotational return requirements, and DIY robotics or automation projects where repeatable torque is critical. The multi-pack format suits prototyping, batch repairs, and stocking spare parts for ongoing maintenance.
Made from spring steel wire for consistent elastic return, fatigue resistance, and dimensional stability across repeated deflection cycles.
Wound left-hand (counterclockwise from the front), tightening under clockwise rotation — correct for a wide range of standard mechanical assemblies.
Available in 3, 4, 5, 6, 7, 8, or 9 active coils, allowing you to match the spring rate and free length required by your application.
Select from 60°, 90°, 120°, or 180° leg angles to match your mounting geometry without bending or modifying the spring legs.
Each order includes 10 identical springs — ideal for batch repairs, prototyping multiple iterations, or keeping spares on hand for ongoing maintenance.
Eight outer diameter options from 10 mm to 20 mm (0.39"–0.79") cover a broad range of shaft and bore sizes found in consumer and industrial hardware.
| Wire Diameter | 1.8 mm (0.071 in) |
|---|---|
| Outer Diameter (OD) | 10 mm – 20 mm (0.39 in – 0.79 in) — See variant options |
| Number of Active Coils | 3 – 9 Coils — See variant options |
| Leg Angle | 60° / 90° / 120° / 180° — See variant options |
| Wind Direction | Left-Hand (counterclockwise) |
| Material | Spring Steel |
| Surface Finish | See variant options |
| Quantity per Pack | 10 pcs |
| Spring Rate | See variant options |
| Free Angle | See variant options |
Measure the shaft or bore your spring will wrap around. The spring's inner diameter (ID = OD minus 2× wire diameter) should be slightly larger than the shaft for a free fit, or slightly smaller if you need a press fit. For a 1.8 mm wire spring, the ID equals the OD minus 3.6 mm. Select the OD variant that gives you the correct ID for your shaft size.
Left-hand wound means the coils spiral counterclockwise when viewed from the front (the end where the leg exits). The spring tightens — stores energy — when rotated clockwise. To confirm your requirement: hold the existing spring with the body facing you. If the coils go counterclockwise, you need a left-hand spring. If clockwise, you need a right-hand spring. These springs are left-hand only.
More active coils result in a lower spring rate (softer spring) and a longer body length for the same wire diameter and OD. Fewer coils produce a stiffer spring with a shorter body. Choose a higher coil count if you need a gentler return force over a larger angular deflection, or a lower coil count for a firmer, more compact 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 mounting geometry so the legs align with your fixture holes or slots without pre-stressing the spring. Common choices: 90° for right-angle brackets, 180° for parallel-leg configurations, 60° or 120° for angled mounts. If your application requires a different angle, the legs can sometimes be carefully bent, but ordering the correct angle is recommended for consistent performance.
Standard spring steel offers moderate corrosion resistance suitable for indoor and dry environments. For outdoor, humid, or chemically exposed applications, consider applying a light coat of machine oil or grease to the spring surface, or contact us to confirm whether a coated or stainless variant is available for your size. Prolonged exposure to moisture without protection may cause surface oxidation over time.
Spring steel provides good fatigue life for moderate-cycle applications such as cabinet hinges, appliance mechanisms, and light automation. For high-cycle industrial applications (millions of cycles), verify the required spring rate and stress levels against the spring's specifications. Operating a spring beyond its elastic limit or at excessive deflection angles will reduce fatigue life. Contact us if you need cycle-life data for your specific variant.
All variants share the same 1.8 mm wire diameter, so the spring rate per coil is primarily determined by the OD and wire diameter ratio. A larger OD with the same wire diameter produces a lower spring rate (less torque per degree of deflection) and a larger inner bore. A smaller OD produces a stiffer spring with a smaller bore. For the same coil count and deflection angle, the 10 mm OD variant will generate more torque than the 20 mm OD variant.
