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When a mechanism fails because a tiny torsion spring loses its tension or snaps under repeated cycling, finding an exact replacement becomes a frustrating hunt. Engineers, hobbyists, and repair technicians working on small instruments, electronics, hinges, and precision assemblies need a reliable source of accurately specified left-hand torsion springs in a range of coil counts and leg angles.
These torsion springs are wound from spring steel wire with a diameter of 0.3mm (approximately 0.012 in). The outer diameter spans from 2mm to 5mm (roughly 0.079–0.197 in) across the available size variants, with coil counts from 3 to 9 and leg angles of 60°, 90°, 120°, or 180°. Each pack contains 10 pieces of the same specification.
Typical applications include small hinge return mechanisms in eyeglass frames and lids, tension elements in miniature clamps and clips, reset springs in precision instruments and sensors, and replacement springs in consumer electronics such as camera shutters and switch assemblies.
Wound in a left-hand direction to suit mechanisms requiring counter-clockwise torque application or specific directional preload.
Seven outer diameter options (2–5mm in 0.5mm steps) combined with seven coil counts (3–9) and four leg angles (60°/90°/120°/180°) give 196 distinct configurations.
Made from spring steel wire for consistent elastic return, fatigue resistance under repeated cycling, and reliable torque delivery in compact spaces.
Each order ships 10 identical springs, giving you spares for prototyping, batch repairs, or stocking your workshop without overpaying for bulk quantities.
Four leg angle options — 60°, 90°, 120°, and 180° — allow direct replacement or design-in for a wide range of hinge, clip, and return-spring geometries.
With a 0.3mm wire diameter and OD starting at 2mm, these springs fit into tight spaces where standard hardware-store springs are far too large.
| Wire Diameter | 0.3 mm (approx. 0.012 in) |
|---|---|
| Outer Diameter (OD) | 2 mm / 2.5 mm / 3 mm / 3.5 mm / 4 mm / 4.5 mm / 5 mm |
| Number of Coils | 3 / 4 / 5 / 6 / 7 / 8 / 9 Coils (select variant) |
| Leg Angle | 60° / 90° / 120° / 180° (select variant) |
| Winding Direction | Left-Hand (LH) |
| Material | Spring Steel |
| Surface Finish | See variant options |
| Free Length (body) | See variant options |
| Quantity per Pack | 10 pieces |
| Application | Hinges, clips, instruments, electronics, precision assemblies |
Measure the OD of your existing spring with calipers, then count the active coils (the full 360° turns between the legs). Match both values exactly for a direct replacement. If designing from scratch, the OD determines the mandrel size and the coil count affects the angular deflection range and spring rate — more coils give a lower spring rate for the same wire and OD.
Left-hand (LH) winding means the coils spiral counter-clockwise when viewed from the leg end. To identify your existing spring's hand: hold the spring with one leg pointing away from you — if the coils wind to the left (counter-clockwise), it is left-hand. LH springs are loaded by rotating the legs in the direction that tightens the coils. Using the wrong hand will cause the spring to unwind rather than store energy.
Exact torque values depend on the specific OD, coil count, and deflection angle selected. With a 0.3mm wire diameter, these are miniature springs designed for light-duty applications such as small hinges, clips, and instrument mechanisms. They are not rated for heavy-load industrial use. If you need precise torque figures for your design, contact us with your selected variant details.
These springs are made from spring steel, which offers good mechanical properties but limited inherent corrosion resistance compared to stainless steel. For applications exposed to moisture, humidity, or mild chemicals, consider applying a light protective coating after installation, or contact us to inquire about stainless steel alternatives if available.
The leg angle is the angle between the two legs of the spring in its free (unloaded) state. Choose the angle that matches your existing spring or the geometry your mechanism requires. A 90° spring is common for right-angle hinge returns; 180° (straight legs) suits applications where both legs extend in opposite directions. If replacing an existing spring, measure the free angle before ordering.
Yes. Each pack contains 10 identical springs, making them suitable for prototyping, small-batch repairs, or stocking your workshop. For larger production quantities, contact us to discuss bulk pricing options.
The inner diameter equals the outer diameter minus twice the wire diameter. For example, the 0.3×2mm variant has an ID of approximately 1.4mm (2mm OD − 2×0.3mm). Use this to size the mandrel or shaft the spring will ride on — the mandrel should be slightly smaller than the ID to allow free rotation.
