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When a door hinge binds, a mechanical arm loses its return force, or a cabinet lid no longer stays put, the culprit is almost always a worn or incorrectly specified torsion spring. Engineers, maintenance technicians, and serious DIYers who need a right-hand wound torsion spring with a 2.5mm wire diameter and outer diameters ranging from 12mm to 30mm (approximately 0.47" to 1.18") will find this pack of 10 springs an efficient, cost-effective solution.
Each spring in this pack is wound from 2.5mm wire diameter steel, with outer diameters selectable from 12mm up to 30mm (0.47"–1.18"). Coil counts range from 3 to 9 active coils, and leg angles are available in 60°, 90°, 120°, and 180° to match your exact torque and geometry requirements. The right-hand wind direction means the spring tightens when rotated clockwise when viewed from the leg end.
Typical use cases include garage door mechanisms requiring right-hand torsion spring replacement, industrial machinery return arms needing a compact 12–16mm OD spring, and custom fabrication projects where a 20–30mm OD torsion spring with a specific leg angle is critical for repeatable actuation.
| Wire Diameter | 2.5 mm (0.098") |
|---|---|
| Outer Diameter (OD) | 12 mm – 30 mm (0.47" – 1.18") — See variant options |
| Inner Diameter (ID) | OD minus 5 mm (varies by OD selection) |
| Number of Active Coils | 3, 4, 5, 6, 7, 8, or 9 — See variant options |
| Leg Angle | 60°, 90°, 120°, or 180° — See variant options |
| Wind Direction | Right-hand (clockwise when viewed from leg end) |
| Material | Steel wire (spring grade) |
| Surface Finish | See variant options |
| Pack Quantity | 10 pieces |
| Spring Rate | See variant options (varies by OD and coil count) |
Measure the mandrel or shaft the spring will wrap around. The spring inner diameter (OD minus 5mm for 2.5mm wire) must be slightly larger than the mandrel to allow free rotation. For example, if your mandrel is 10mm, a 16mm OD spring gives a 11mm ID — a comfortable fit. If the spring mounts over a housing, measure the bore and select an OD that fits inside with clearance.
Right-hand wound means the coils spiral clockwise when you look at the spring from the end where the leg exits. The spring tightens (stores energy) when rotated clockwise. To confirm: hold the spring vertically and look at the top leg — if the coils wind away from you in a clockwise direction, it is right-hand. If your mechanism loads the spring by rotating it counter-clockwise, you need a left-hand wound spring instead.
More active coils reduce the spring rate (softer spring, more angular travel for the same torque) and increase the maximum angular deflection before yielding. Fewer coils produce a stiffer spring with higher torque per degree of rotation. For applications requiring large angular travel (e.g., 90°–180° rotation), choose 7–9 coils. For high-torque, low-travel applications, 3–4 coils are more appropriate.
The leg angle is the angle between the two straight legs of the spring when it is in its free (unloaded) state. Select the angle that matches the geometry of your fixture in the unloaded position. A 90° spring has its legs perpendicular; a 180° spring has both legs pointing in the same direction (parallel). If your fixture holds the legs at 90° when unloaded, order a 90° spring to avoid pre-stressing the spring during assembly.
These springs are manufactured from spring-grade steel wire. Steel torsion springs are suitable for dry indoor environments. For applications exposed to moisture, humidity, or mild chemicals, consider applying a light coat of corrosion-inhibiting oil after installation. For outdoor or wet environments, contact us to confirm suitability or inquire about alternative finishes.
Torsion springs in the 12–30mm OD range with 2.5mm wire are typically suited for light-duty garage doors, cabinet doors, and small access panels rather than full-size residential garage doors (which typically use much larger wire diameters of 4mm+). Verify the required torque and cycle life for your specific door weight and size before ordering. For light cabinet or small panel doors, these springs are well-suited.
Always pre-load torsion springs with appropriate tools and never by hand alone, as stored energy can cause injury if the spring slips. Ensure the mandrel is secured before winding. Wear safety glasses during installation. For light-duty applications (cabinet hinges, small mechanisms), the springs in this pack can typically be installed by hand with care, but always confirm the torque level is within safe manual handling limits for your specific variant.
