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When a worn-out or missing torsion spring causes your mechanism to fail — whether it's a hinge, latch, clip, or small actuator — finding the right replacement with the exact wire diameter, outer diameter, and return angle is critical. These torsion springs are designed for engineers, hobbyists, and repair technicians who need reliable, precisely wound coil springs in a wide range of configurations.
Each spring is wound from 0.3mm (approx. 0.012 in) steel wire with an outer diameter ranging from 2mm to 5mm (approx. 0.079–0.197 in) and a body length of approximately 20mm (0.79 in). The coil count ranges from 3 to 9 turns, and the leg angle is available in 60°, 90°, 120°, or 180° to match your specific return-force requirement.
Typical use cases include small appliance repair (pen clips, door latches, lid hinges), electronics enclosures, precision instruments, model engineering, and custom DIY mechanisms requiring a compact torsion spring with a defined angular return force.
Wound from 0.3mm steel wire for consistent spring rate and reliable performance in compact mechanisms.
Outer diameters from 2mm to 5mm (0.079–0.197 in) cover a broad range of shaft and housing sizes.
Available in 60°, 90°, 120°, and 180° leg angles to match your required return-force direction and travel.
Choose from 3 to 9 coils — more coils increase flexibility and reduce spring rate for lighter-duty applications.
Approximately 20mm (0.79 in) body length fits tight spaces in small appliances, electronics, and instruments.
Ideal for pen clips, door latches, lid hinges, model engineering, and custom DIY torsion spring replacements.
| Wire Diameter | 0.3 mm (approx. 0.012 in) |
|---|---|
| Outer Diameter (OD) | 2 mm – 5 mm (0.079 – 0.197 in) — See variant options |
| Body Length | Approx. 20 mm (0.79 in) |
| Number of Coils | 3 – 9 coils — See variant options |
| Leg Angle | 60° / 90° / 120° / 180° — See variant options |
| Inner Diameter (ID) | OD minus 2× wire diameter — See variant options |
| Material | Steel wire (spring steel) |
| Wind Direction | See variant options |
| Spring Rate | See variant options |
| Surface Finish | See variant options |
Measure the shaft or mandrel your spring will wrap around. The inner diameter of the spring (OD minus 2× wire diameter, so OD minus 0.6mm) should be slightly larger than your shaft for a free fit, or slightly smaller for a tight fit that increases torque. Select the OD variant closest to your requirement.
The leg angle determines the angular position of the two legs relative to each other when the spring is at rest. A 90° spring has legs perpendicular at rest; a 180° spring has legs pointing in opposite directions. Choose the angle that matches the travel and return direction your mechanism requires.
More coils (e.g., 9 coils) result in a lower spring rate — the spring deflects more easily for a given torque. Fewer coils (e.g., 3 coils) produce a stiffer spring with a higher spring rate. Choose a higher coil count for lighter-duty or more flexible applications, and fewer coils for stiffer return force.
These springs are made from steel wire. For indoor or dry environments they perform reliably. For humid or outdoor applications, consider applying a light coating of oil or grease, or contact us to confirm if a coated or stainless variant is available for your size.
These compact torsion springs are suited for small appliances (pen clips, lid hinges, door latches), electronics enclosures, precision instruments, model engineering, hobby projects, and any DIY mechanism requiring a defined angular return force in a tight space. Verify OD, ID, and leg angle against your design before ordering.
Match the leg angle to the angular travel your mechanism needs. If your component needs to return from a 90° deflection, a 90° spring is a natural starting point. For mechanisms with longer travel or where legs need to be nearly parallel at rest, choose 120° or 180°. When in doubt, 90° is the most common general-purpose choice.
The listed variants cover wire diameter 0.3mm with OD 2–5mm, coil counts 3–9, and angles 60°–180°. If you need a configuration outside these options, please contact us via the store's contact page with your specifications and we will advise on availability.
