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When a mechanism fails because a torsion spring snapped, stretched, or simply never fit right, the repair stalls — and so does your project. Whether you are a mechanical engineer sourcing replacement springs, a hobbyist building a custom jig, or a technician maintaining industrial equipment, finding a left-hand torsion spring in the exact wire diameter, outer diameter, coil count, and leg angle you need is rarely straightforward. These torsion springs are engineered to fill that gap with a broad matrix of configurable dimensions.
Each pack contains 10 pieces of left-hand wound torsion springs manufactured from spring steel. Wire diameter is 1.4 mm (approximately 0.055 in). Outer diameter (OD) ranges from 7 mm to 15 mm (approximately 0.28 in to 0.59 in) depending on the variant selected. Coil counts span 3 to 9 coils, and leg angles are available in 60°, 90°, 120°, and 180°, giving you precise control over the torque arm geometry.
Typical applications include door latch mechanisms requiring left-hand rotational return force, precision instrument panels where a specific leg angle is critical, custom robotics and automation assemblies needing compact torsion elements, and general mechanical repair where an OEM spring has failed and an exact-spec replacement is required.
Made from spring steel for consistent elastic return, resistance to fatigue, and durability across repeated deflection cycles in mechanical assemblies.
Nine OD options (7 mm to 15 mm), seven coil counts (3–9), and four leg angles (60°, 90°, 120°, 180°) let you dial in the exact geometry your application demands.
Wound counterclockwise to generate torque in the correct direction for left-hand applications — critical for mechanisms where winding direction affects function.
Each order ships as a pack of 10 identical springs, ideal for batch repairs, prototyping runs, or keeping spares on hand for maintenance schedules.
Four leg angle options — 60°, 90°, 120°, and 180° — ensure the spring legs align correctly with your mounting points without bending or modification.
Uniform coil pitch and wire diameter across the production run ensure repeatable torque characteristics and reliable fit in close-tolerance housings.
| Wire Diameter | 1.4 mm (approx. 0.055 in) |
|---|---|
| Outer Diameter (OD) | 7 mm – 15 mm (approx. 0.28 in – 0.59 in) — See variant options |
| Number of Coils | 3 – 9 Coils — See variant options |
| Leg Angle | 60°, 90°, 120°, 180° — See variant options |
| Wind Direction | Left-hand (counterclockwise) |
| Material | Spring Steel |
| Quantity per Pack | 10 pieces |
| Inner Diameter (ID) | See variant options (OD minus 2× wire dia) |
| Surface Finish | See variant options |
| Operating Temperature | Contact us to confirm |
Measure the OD of your existing spring with calipers, or measure the bore/housing it sits in and subtract a small clearance. Count the active coils on the original spring. Match both values to the variant options above. If you are designing from scratch, calculate the required torque using the spring rate formula and select coil count accordingly.
Left-hand springs are wound counterclockwise when viewed from the front. They generate torque in the counterclockwise direction when deflected. Right-hand springs are wound clockwise. Using the wrong wind direction in a mechanism can cause the spring to unwind rather than store energy, leading to failure. Always confirm the wind direction required by your application before ordering.
Torque depends on the wire diameter, OD, coil count, and deflection angle. With a 1.4 mm wire diameter, these springs are suited for light-to-medium duty applications. Exact spring rate (N·mm/°) varies by variant. If you need a specific torque value, contact us with your OD, coil count, and deflection angle and we can provide an estimate.
Spring steel provides good mechanical properties but has limited inherent corrosion resistance compared to stainless steel. For outdoor or high-humidity environments, consider applying a protective coating after installation, or contact us to confirm whether a coated variant is available for your size.
The leg angle is the angle between the two spring legs when the spring is in its free (unloaded) state. Choose the angle that matches your mounting geometry so the legs align with your anchor points without pre-stressing the spring. A 90° spring is the most common for general mechanisms; 180° suits applications where both legs point in opposite directions along the same axis.
Yes, provided you match the wire diameter (1.4 mm), OD, coil count, leg angle, and wind direction to the original specification. Measure your existing spring carefully before selecting a variant. If the OEM spring has a non-standard leg angle not listed here, contact us to discuss custom options.
The inner diameter equals the outer diameter minus twice the wire diameter. For example, a 1.4 × 10 mm variant has an ID of approximately 10 − (2 × 1.4) = 7.2 mm. Use this to verify the spring will fit over a shaft or mandrel in your assembly.
