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When a tiny spring fails inside a hinge, latch, or precision instrument, finding the exact replacement can be a frustrating search. These 0.3mm wire diameter torsion springs are engineered for engineers, hobbyists, and repair technicians who need reliable rotational force in compact assemblies — from electronics enclosures and medical devices to model mechanisms and industrial tooling.
Each spring is wound from 0.3mm (approx. 0.012 in) spring steel wire with outer diameters ranging from 1.5mm to 5mm (approx. 0.059–0.197 in) and coil counts of 3, 6, or 9 turns. Leg angles are available in 60°, 90°, 120°, and 180°, with both left-hand (rotate left) and right-hand (rotate right) winding directions to match your application's torque requirement.
Typical use cases include small hinge return mechanisms, spring-loaded clip assemblies, precision instrument reset springs, and miniature latch systems where consistent angular force and compact geometry are critical. Long-tail applications include small torsion spring for electronics, miniature coil spring replacement, and 0.3mm wire spring for DIY repair.
OD options from 1.5mm to 5mm combined with 3, 6, or 9 coil counts give you 24 size combinations to match your exact spatial constraints.
Choose 60°, 90°, 120°, or 180° leg angles to suit the rotational geometry of your mechanism without custom fabrication.
Both rotate-left and rotate-right winding directions are stocked, ensuring correct torque application regardless of your assembly orientation.
Uniform wire diameter and controlled coil pitch deliver repeatable angular torque across the full deflection range of the spring.
Wound from spring steel wire for resilience under repeated cycling, maintaining shape and torque output over extended service life.
Each variant is sold as a single spring, letting you order exactly the quantity you need for prototyping, repair, or small-batch production.
| Wire Diameter | 0.3 mm (approx. 0.012 in) |
|---|---|
| Outer Diameter (OD) | 1.5 / 2 / 2.5 / 3 / 3.5 / 4 / 4.5 / 5 mm — See variant options |
| Number of Coils | 3 / 6 / 9 — See variant options |
| Leg Angle | 60° / 90° / 120° / 180° — See variant options |
| Winding Direction | Rotate Left / Rotate Right — See variant options |
| Material | Spring Steel |
| Finish | Bare / Natural Steel |
| Spring Type | Torsion (angular force) |
| Free Angle | See variant options |
| Torque Rating | See variant options |
| Quantity per Order | 1 piece |
Measure the shaft or pin your spring will wrap around — the spring's inner diameter (OD minus 2× wire diameter) should fit snugly over it. For coil count, more coils generally mean a lower spring rate (softer torque per degree), so choose 3 coils for stiffer response and 9 coils for a more gradual force build-up.
Winding direction determines which way the spring coils tighten under load. A rotate-left (left-hand wound) spring should be loaded by rotating its active leg counterclockwise; a rotate-right (right-hand wound) spring is loaded clockwise. Using the wrong direction will cause the coils to open rather than close, reducing holding force.
The leg angle is the angle between the two straight legs of the spring in its free (unloaded) state. Select the angle that matches the geometry of your assembly at rest. For example, a 90° spring is common in door latches and hinges where the two legs need to be perpendicular when unloaded.
Bare spring steel offers moderate corrosion resistance suitable for indoor and dry environments. For applications exposed to moisture or mild chemicals, consider applying a light oil or protective coating after installation. If your environment is highly corrosive, contact us to confirm suitability before ordering.
Yes. Spring steel is selected for its elastic memory, meaning it returns to its original shape after deflection. Under normal operating loads within the spring's rated deflection range, these springs maintain consistent torque output over many thousands of cycles. Avoid over-deflecting beyond the design angle to maximise service life.
Check four parameters: (1) OD — must clear any housing bore; (2) wire diameter — 0.3mm is fixed for all variants; (3) coil count — affects free length and spring rate; (4) leg angle and winding direction — must match your assembly's geometry and load direction. If you are unsure, contact us with your application details and we can help you select the correct variant.
Each listing is for one (1) individual spring. This allows you to order the exact quantity needed for prototyping or repair without purchasing unnecessary extras. For bulk quantities, please contact us for availability.
