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When a tiny spring fails inside a precision instrument, a door latch, or a miniature hinge, finding the exact replacement can be a frustrating search. Engineers, hobbyists, and repair technicians who work with compact mechanisms need a reliable source for small torsion springs that ship in exact, configurable specs — not guesswork. These 0.3mm wire diameter torsion springs are designed for that exact scenario.
Each spring is wound from 0.3mm (approx. 0.012 in) wire with outer diameters ranging from 1.5mm to 5mm (approx. 0.059 in to 0.197 in). Coil counts are available in 3, 6, or 9 turns, and each variant can be selected with an opening angle of 60°, 90°, 120°, or 180°, in either left-hand (rotate left) or right-hand (rotate right) winding direction.
Typical applications include small torsion spring replacement in eyeglass hinges, pen clips, and precision instrument latches; miniature torsion spring for electronics enclosures and snap-fit covers; and compact coil spring for model-making, robotics prototyping, and DIY mechanical assemblies requiring controlled return force.
Wound from 0.3mm wire for consistent torque output in miniature and micro-scale mechanisms.
Outer diameters from 1.5mm to 5mm let you match the spring to your bore or housing with accuracy.
Choose 3, 6, or 9 coils to tune spring rate and deflection range for your specific load requirement.
Available in 60°, 90°, 120°, and 180° leg angles to fit varied mounting geometries without bending.
Both rotate-left and rotate-right variants available — select the correct hand to match your assembly's torque direction.
Suited for eyeglass hinges, pen clips, electronics latches, robotics, model-making, and precision DIY repairs.
| Wire Diameter | 0.3mm (approx. 0.012 in) |
|---|---|
| Outer Diameter (OD) | 1.5 / 2 / 2.5 / 3 / 3.5 / 4 / 4.5 / 5mm |
| Number of Coils | 3 / 6 / 9 turns |
| Leg Angle | 60° / 90° / 120° / 180° |
| Winding Direction | Rotate Left / Rotate Right |
| Material | See variant options |
| Surface Finish | See variant options |
| Spring Rate | See variant options |
| Free Angle | See variant options |
| Inner Diameter (ID) | See variant options |
Measure the shaft or bore your spring will wrap around. The spring's inner diameter (OD minus twice the wire diameter) should be slightly larger than the shaft for a free-fit, or slightly smaller for a press-fit. For a 0.3mm wire spring, the inner diameter is approximately OD − 0.6mm. Select the OD option closest to your target inner diameter plus 0.6mm.
More coils generally mean a lower spring rate (softer spring) and greater angular deflection capacity before the spring reaches its elastic limit. A 3-coil spring is stiffer and more compact; a 9-coil spring is more flexible and can absorb more angular travel. Choose based on the torque and deflection your mechanism requires.
The winding direction determines which direction the spring tightens when torque is applied. If your mechanism applies torque in a clockwise direction (when viewed from the leg end), choose a right-hand (rotate right) spring. For counter-clockwise torque, choose left-hand (rotate left). Matching the winding direction to your load direction prevents the coils from unwinding under stress.
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 mounting geometry. For example, if your two mounting pins are 90° apart, choose the 90° variant. If you need the spring to exert force from a different starting position, choose the angle that reflects the free position of your assembly.
The corrosion resistance depends on the material of the specific variant. For applications in humid or outdoor environments, we recommend confirming the material specification via the variant options or by contacting us. Springs used in dry, indoor environments typically perform well across standard operating conditions.
Yes. The 0.3mm wire diameter and OD range of 1.5–5mm make these springs well-suited for eyeglass hinge repairs, pen clip mechanisms, small electronics latches, and similar precision consumer product applications. Select the OD and coil count that matches the original spring specification for a direct replacement.
If none of the available combinations match your exact requirement, please contact us with your target wire diameter, OD, coil count, leg angle, and winding direction. We can advise on the closest available option or discuss custom sourcing for larger quantities.
