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When a mechanism fails to snap back, a door hinge loses its tension, or a DIY assembly needs consistent rotational force, the culprit is almost always an undersized or wrong-hand spring. These left-hand wound torsion springs are engineered for builders, repair technicians, and hobbyists who need a dependable, precisely specified component — not a generic substitute.
Each left-hand torsion spring is wound from 1.6 mm (0.063 in) spring steel wire with an outer diameter ranging from 8 mm to 18 mm (0.31 in to 0.71 in). Coil counts span 3 to 9 turns, and leg angles are available at 60°, 90°, 120°, and 180°, giving you fine control over the spring's free position and working range.
Typical applications include cabinet door return mechanisms requiring a left-hand torsion spring with 90° leg angle, compact hinge assemblies needing a 1.6mm wire torsion spring with small outer diameter, and precision DIY jigs or fixtures where a specific coil count and leg angle determine the correct preload torque.
| Wire Diameter | 1.6 mm (0.063 in) |
|---|---|
| Outer Diameter (OD) | 8 mm – 18 mm (0.31 in – 0.71 in) |
| 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 |
| Spring Rate | See variant options |
| Free Angle | Determined by leg angle selected |
| Inner Diameter | OD minus 2× wire diameter (varies by variant) |
The outer diameter (OD) should be slightly larger than the shaft or mandrel it wraps around. The inner diameter equals the OD minus twice the wire diameter (1.6 mm × 2 = 3.2 mm). For example, a 10 mm OD spring has an inner diameter of approximately 6.8 mm. Choose an OD so the spring slides freely over the shaft without excessive play.
More active coils increase the spring's angular deflection capacity and reduce the spring rate (softer feel per degree of rotation). Fewer coils produce a stiffer spring with less total travel. Match the coil count to your required torque output and the angular range your mechanism needs to operate through.
The leg angle defines the free (unloaded) position of the two legs relative to each other. A 90° spring has its legs at a right angle at rest; a 180° spring has them pointing in opposite directions. Choose the angle that matches your assembly's geometry so the spring is neither pre-stressed nor slack when installed in its neutral position.
This spring is left-hand (counterclockwise) wound. Wind direction matters because loading a torsion spring in the correct direction tightens the coils and increases the spring rate, while loading in the wrong direction loosens them and can cause the spring to unwind or fail prematurely. Confirm your mechanism loads the spring counterclockwise before ordering.
These springs are wound from hardened spring steel wire, which provides a good balance of strength, elasticity, and resistance to permanent set under repeated loading. For applications in humid or corrosive environments, consider whether additional surface protection is needed; contact us to confirm finish options for your use case.
Standard spring steel has limited corrosion resistance. For outdoor or wet environments, a protective coating or stainless steel alternative is recommended. Contact us to confirm available finish options before purchasing for outdoor applications.
Torsion spring torque depends on the wire diameter, coil diameter, number of active coils, and the angular deflection from the free position. For a precise torque calculation for your specific variant, contact us with your selected OD, coil count, leg angle, and required deflection angle, and we can assist with the engineering data.
