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When a standard spring simply won't do, engineers, makers, and DIY enthusiasts reach for a torsion spring that matches their exact geometry. Mismatched wire diameter, outer diameter, or coil count leads to premature fatigue, binding, or outright failure — costing time and money. These left-hand wound torsion springs are engineered for users who need reliable rotational force in a compact, corrosion-resistant package.
Each spring is formed from 1.4mm diameter stainless steel wire, wound in a left-hand (counterclockwise) direction. Outer diameters span 10mm to 18mm (approx. 0.39" to 0.71"), and coil counts range from 1 to 5 turns. Leg angles are available in 45°, 60°, 90°, 120°, 180°, and 270°, giving you precise control over the spring's working position.
Typical applications include cabinet door hinges requiring left-hand return force, small machinery and automation mechanisms needing angular torque, precision instrument assemblies, and DIY repair projects where a specific rotation angle and wire gauge must be matched exactly.
| Wire Diameter | 1.4 mm |
|---|---|
| Wind Direction | Left-hand (counterclockwise) |
| Outer Diameter (OD) | 10 mm / 12 mm / 14 mm / 16 mm / 18 mm (see variant options) |
| Inner Diameter (ID) | See variant options |
| Number of Coils | 1 / 2 / 3 / 4 / 5 (see variant options) |
| Leg Angle | 45° / 60° / 90° / 120° / 180° / 270° (see variant options) |
| Material | Stainless steel |
| Spring Rate | See variant options |
| Free Angle | See variant options |
| Surface Finish | Natural stainless (no coating) |
| Quantity per Order | 1 piece |
Measure the bore or housing your spring will sit in, then select an OD slightly smaller to allow free rotation. For a shaft-mounted spring, the inner diameter (OD minus 2× wire diameter) must clear the shaft. Available ODs are 10mm, 12mm, 14mm, 16mm, and 18mm — pick the closest match to your housing dimension.
A left-hand (counterclockwise) wound torsion spring loads — stores energy — when its body is rotated clockwise. If you install a left-hand spring where a right-hand spring is required, the spring will unwind under load instead of resisting it, causing immediate failure. Always confirm the wind direction matches your mechanism's rotation.
More coils increase the spring's angular deflection capacity and reduce the spring rate (making it softer for a given angle). Fewer coils produce a stiffer spring with less total travel. Choose 1–2 coils for stiff, short-travel applications and 4–5 coils where you need a softer, longer-travel return force.
Yes — stainless steel offers good resistance to rust and oxidation, making these springs suitable for indoor use, light outdoor exposure, and environments with occasional moisture. For continuous immersion or highly corrosive chemical environments, contact us to confirm suitability.
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 mechanism's geometry so the legs engage your mounting points correctly without pre-stressing the spring. Common choices: 90° for right-angle brackets, 180° for parallel-leg applications, 270° for over-center mechanisms.
Yes, provided you match all key parameters: wire diameter (1.4mm), outer diameter, wind direction (left-hand), number of coils, and leg angle. Even a small mismatch in OD or coil count will change the spring rate and may cause the spring to bind or under-perform. Measure your existing spring carefully before selecting a variant.
A torsion spring stores energy through angular (rotational) deflection — the legs twist relative to each other. Compression springs resist being pushed together along their axis, and extension springs resist being pulled apart. Torsion springs are used wherever you need a rotational return force, such as hinges, latches, and levers.
