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When a hinge sticks, a lid won't stay open, or a mechanism loses its return force, the culprit is almost always a worn or incorrectly sized torsion spring. Engineers, machinists, and hands-on DIYers who need a reliable double-leg torsion spring with a consistent 2mm wire diameter will find this range covers the most common OD and coil-count combinations in a single listing.
Each torsion spring in this series features a 2mm wire diameter with outer diameters ranging from 10mm to 20mm (~0.39–0.79 in) and coil counts of 3, 6, or 9 turns. The body is formed from carbon spring steel, delivering firm, repeatable torque across the full deflection range. Available in left-hand and right-hand wind orientations, with leg angles of 60°, 90°, 120°, and 180° to match your assembly geometry.
Typical applications include cabinet door hinges requiring a torsion spring replacement, automotive hood or trunk lid mechanisms, small appliance return springs, jig and fixture clamps, and custom DIY torsion spring projects where exact wire diameter and OD must be matched to an existing bore or shaft.
Consistent 2mm carbon spring steel wire across all variants for predictable spring rate and torque output.
Outer diameters from 10mm to 20mm (0.39–0.79 in) let you match the spring to your bore or housing without modification.
Choose 3, 6, or 9 active coils to tune the spring rate — more coils yield a softer, longer-travel spring; fewer coils give a stiffer, shorter-travel response.
Both winding orientations available so the spring torques in the correct direction for your mechanism's rotation.
Pre-formed leg angles of 60°, 90°, 120°, and 180° eliminate the need for manual bending and ensure repeatable assembly positioning.
Formed from carbon spring steel for firm elastic return, resistance to fatigue under repeated cycling, and dimensional stability over time.
| Wire Diameter | 2 mm |
|---|---|
| Outer Diameter (OD) | 10 mm – 20 mm (0.39 – 0.79 in) |
| Active Coils | 3 / 6 / 9 (see variant options) |
| Leg Angle | 60° / 90° / 120° / 180° (see variant options) |
| Wind Direction | Left-hand / Right-hand (see variant options) |
| Material | Carbon spring steel |
| Surface Finish | See variant options |
| Spring Rate | See variant options |
| Free Angle | See variant options |
| Inner Diameter (ID) | Approximately OD minus 4 mm (varies by coil count) |
| Unit Quantity | 1 piece per order |
Measure the bore or housing your spring will sit inside, then select an OD that fits with a small clearance — typically 0.5–1mm smaller than the bore. If the spring wraps around a shaft, the inner diameter (approximately OD minus 4mm for a 2mm wire) must be larger than the shaft diameter.
Wind direction determines which way the spring torques when deflected. A left-hand wound spring tightens (stores energy) when rotated counterclockwise; a right-hand wound spring tightens when rotated clockwise. Match the wind direction to the rotation direction of your mechanism to ensure the spring works correctly.
More active coils (e.g., 9 coils) produce a lower spring rate — the spring deflects more for the same applied torque, giving a softer, longer-travel feel. Fewer coils (e.g., 3 coils) produce a higher spring rate — stiffer with less angular travel. Choose based on the torque and deflection angle your application requires.
These springs are made from carbon spring steel, which provides good mechanical properties but has limited inherent corrosion resistance. For outdoor or humid environments, consider applying a light coat of oil or grease after installation, or contact us to confirm if a coated variant is available for your size.
The leg angle is the angle between the two straight legs of the spring in its free (unloaded) state. Choose the angle that matches your assembly's geometry when the spring is at rest. For example, a 90° spring is common for right-angle hinge applications, while 180° suits applications where both legs point in opposite directions along the same axis.
Yes, provided you match the wire diameter (2mm), outer diameter, coil count, wind direction, and leg angle of the original spring. Measure your existing spring carefully or refer to its part number before selecting a variant. If you are unsure, contact us with your measurements and we can help confirm compatibility.
Maximum safe deflection depends on the coil count and OD. As a conservative guideline, torsion springs with 3 active coils typically handle up to approximately 90°–120° of deflection; 6-coil versions up to approximately 180°–270°; and 9-coil versions up to approximately 270°–360°. Exceeding these ranges may cause permanent set or fatigue failure. Contact us to confirm for your specific variant.
