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When a standard single-leg spring just won't hold its position under load, engineers and DIY builders reach for a double torsion spring. Designed for applications where balanced torque and symmetrical force distribution matter — from cabinet hinges and tool clamps to industrial fixtures and custom mechanisms — these 2.5mm wire diameter double torsion springs deliver consistent, repeatable performance across a wide range of angles and coil counts.
Each spring is wound from spring steel wire with a wire diameter of 2.5mm (0.098 in). Outer diameters span 12–30mm (0.47–1.18 in) and coil counts are available in 3, 6, or 9 coils per side. The double-body design means both left and right legs are wound symmetrically around a shared center, providing equal torque on both sides. Available in left-hand and right-hand winding orientations, and in four preset angles: 60°, 90°, 120°, and 180°.
Typical use cases include door and lid hinge return mechanisms, spring-loaded clamp and clip assemblies, precision instrument return springs, and custom DIY torsion spring replacement projects. The wide size matrix — 24 wire×OD×coil combinations × 4 angles × 2 orientations — makes it straightforward to find the exact specification for your application without custom tooling.
| Wire Diameter | 2.5mm (0.098 in) |
|---|---|
| Outer Diameter | 12mm – 30mm (0.47 – 1.18 in) — See variant options |
| Coils per Side | 3 / 6 / 9 — See variant options |
| Leg Angle | 60° / 90° / 120° / 180° — See variant options |
| Winding Direction | Left spring / Right spring — See variant options |
| Material | Spring steel (carbon spring steel) |
| Spring Type | Double torsion (symmetrical double-body) |
| Quantity per Pack | 10 pieces |
| Surface Finish | See variant options |
| Free Length | See variant options |
The outer diameter should be selected based on the shaft or mandrel diameter in your assembly — the spring's inner diameter (OD minus 2× wire diameter) must clear the shaft with a small working gap. Coil count affects the angular deflection range and spring rate: more coils (9) give a softer, longer-travel spring, while fewer coils (3) give a stiffer, shorter-travel spring. Match coil count to the torque and travel your mechanism requires.
Left-hand (LH) and right-hand (RH) refer to the direction the coil is wound when viewed from the leg end. LH springs tighten (increase torque) when rotated counterclockwise; RH springs tighten when rotated clockwise. Select the winding direction that matches the rotation of your shaft or hinge pin. Using the wrong hand will cause the spring to unwind rather than store energy.
Torque output depends on wire diameter, outer diameter, coil count, and deflection angle. With a 2.5mm wire diameter, these springs are suited for light-to-medium duty applications such as cabinet hinges, tool clamps, and instrument return mechanisms. For precise torque values at your required deflection angle, contact us with your specific size selection and we can provide engineering guidance.
These springs are made from carbon spring steel, which provides excellent elastic properties but has limited inherent corrosion resistance. For outdoor or humid environments, we recommend applying a light coat of machine oil or grease after installation, or selecting a stainless steel alternative if long-term corrosion resistance is critical. Contact us to confirm finish options for your application.
Yes, provided you match the wire diameter (2.5mm), outer diameter, coil count, leg angle, and winding direction of the original spring. Measure the original spring's OD and count the coils carefully. If the original leg angle differs from the preset options (60°/90°/120°/180°), choose the closest available angle or contact us for guidance on custom options.
Most door and lid hinge return applications use a 90° or 180° leg angle, depending on the hinge geometry and the closed/open position of the door. If the door closes to 90° from the open position, a 90° spring is typically correct. For doors that swing to a fully flat (180°) open position, a 180° spring is more appropriate. When in doubt, measure the angle between the two legs in the installed position and select accordingly.
Each order is for a pack of 10 identical springs in the size and configuration you select. This makes it convenient for prototyping, multi-unit builds, or keeping spares on hand for maintenance.
