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When a mechanism fails because a worn torsion spring loses its return force, finding an exact replacement in the right wire diameter, outer diameter, and leg angle can be frustrating. These torsion springs are designed for engineers, technicians, and hands-on DIYers who need a reliable, dimensionally consistent spring in small-batch quantities without ordering in bulk.
Each pack contains 10 right-hand wound torsion springs made from carbon spring steel wire with a wire diameter of 0.3 mm (0.012 in). The outer diameter spans from 2 mm (0.079 in) to 5 mm (0.197 in) depending on the variant selected, with coil counts ranging from 3 to 9 and leg angles of 60°, 90°, 120°, or 180°. The inner diameter varies accordingly with the outer diameter and wire size.
Typical use cases include small appliance return mechanisms, electronic device hinges requiring a torsion spring for lid or door return, precision instrument assemblies needing a compact right-hand torsion spring, and hobby robotics or RC model builds where a miniature torsion spring with a specific leg angle is required.
| Wire Diameter | 0.3 mm (0.012 in) |
|---|---|
| Outer Diameter (OD) | 2 mm – 5 mm (0.079 in – 0.197 in) — See variant options |
| Inner Diameter (ID) | OD minus 2× wire diameter — See variant options |
| Number of Coils | 3, 4, 5, 6, 7, 8, or 9 — See variant options |
| Leg Angle | 60°, 90°, 120°, or 180° — See variant options |
| Wind Direction | Right-hand (clockwise) |
| Material | Carbon spring steel |
| Surface Finish | Bright / uncoated |
| Quantity per Pack | 10 pieces |
| Spring Rate | See variant options (varies by OD and coil count) |
| Free Angle | See variant options |
The outer diameter (OD) should be selected based on the bore or housing your spring sits in, or the shaft it wraps around. The inner diameter (ID) equals the OD minus twice the wire diameter (0.6 mm for this 0.3 mm wire). For example, a 0.3×4 mm spring has an ID of approximately 3.4 mm. Measure your shaft diameter and select an OD that gives a small clearance fit.
The leg angle is the angular position of the two spring legs relative to each other in the free (unloaded) state. A 90° spring has legs at a right angle; a 180° spring has legs pointing in opposite directions. Choose the angle that matches your mechanism's geometry in its resting position so the spring is neither pre-stressed nor requires bending the legs to fit.
More coils reduce the angular spring rate (the spring becomes softer and deflects more per unit of torque), while fewer coils increase stiffness. For a given OD and wire diameter, a 9-coil spring will produce less torque at the same deflection angle than a 3-coil spring. Select a higher coil count if you need a gentler return force, or a lower coil count for a firmer snap-back.
These springs are made from carbon spring steel with a bright uncoated finish. They are not inherently corrosion resistant and are best suited for dry indoor environments. For applications exposed to moisture, humidity, or mild chemicals, consider applying a light oil or protective coating after installation, or contact us to inquire about stainless steel alternatives.
A right-hand wound spring coils clockwise when viewed from the front leg end. When torque is applied in the closing (winding) direction, the coils tighten and the spring stores energy. A left-hand wound spring does the opposite. Using the wrong wind direction for your application can cause the spring to unwind under load rather than store energy. All springs in this listing are right-hand wound.
Yes. The compact dimensions (0.3 mm wire, 2–5 mm OD) make these torsion springs well suited for small appliance lids, electronic device hinges, camera mechanisms, and similar precision applications where a miniature right-hand torsion spring with a defined leg angle is required. Verify the ID clears your pivot shaft and the leg angle matches your assembly geometry before ordering.
Each order includes 10 springs of the selected variant (wire diameter × OD, coil count, and leg angle). All 10 springs in a pack are identical. If you need multiple variants, please add each variant separately to your cart.
