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When a mechanical assembly demands reliable rotational force in a compact form, finding the right torsion spring becomes a frustrating puzzle of mismatched dimensions and inconsistent leg angles. Engineers, hobbyists, and repair technicians who need exact specifications — not approximations — will find this range of left-hand wound torsion springs built to match real-world design requirements.
Each pack contains 10 pieces of left-hand torsion springs manufactured from spring steel wire with a diameter of 0.9mm (approx. 0.035 in). The outer diameter spans from 5mm to 10mm (approx. 0.197 in to 0.394 in) across the available variants, with coil counts ranging from 3 to 9 coils and leg angles of 60°, 90°, 120°, or 180°. The inner diameter varies by outer diameter and wire size, typically ranging from approximately 3.2mm to 8.2mm (0.126 in to 0.323 in).
These torsion springs suit a wide range of applications: replacing worn return springs in small appliances and power tools, providing consistent closing force in cabinet hinges and latches, and serving as precision components in custom jigs, robotics, and electromechanical devices where left-hand winding direction is specified by design.
Wound counter-clockwise for applications requiring left-hand torque. Ensures correct load direction in assemblies where winding direction is specified.
Nine outer diameter options (5mm to 10mm) combined with seven coil counts (3–9) and four leg angles (60°, 90°, 120°, 180°) cover a broad range of design requirements in a single product listing.
Made from spring steel wire (0.9mm diameter) offering good elastic memory and resistance to permanent deformation under repeated deflection cycles typical of mechanical assemblies.
Each order includes 10 identical springs, providing spares for prototyping, batch repairs, or stocking a workshop without over-ordering large quantities.
Four defined leg angles — 60°, 90°, 120°, and 180° — allow direct matching to existing spring geometry or design specifications without bending or modification.
Coil counts from 3 to 9 allow tuning of spring rate and deflection range. More coils generally yield a lower spring rate for the same wire and OD combination.
| Wire Diameter | 0.9 mm (approx. 0.035 in) |
|---|---|
| Outer Diameter (OD) | 5 mm – 10 mm (approx. 0.197 in – 0.394 in) — see variant options |
| Inner Diameter (ID) | Approx. 3.2 mm – 8.2 mm (varies by OD variant) |
| Number of Coils | 3, 4, 5, 6, 7, 8, or 9 coils — see variant options |
| Leg Angle | 60°, 90°, 120°, or 180° — see variant options |
| Wind Direction | Left-hand (counter-clockwise) |
| Material | Spring Steel |
| Finish | See variant options |
| Quantity per Pack | 10 pieces |
| Spring Rate | See variant options |
Measure the shaft or mandrel your spring will mount on — the spring's inner diameter should be slightly larger than the shaft for a free fit, or slightly smaller for a press fit. The outer diameter determines the overall spring envelope. Coil count affects the spring rate: more coils with the same wire diameter and OD produce a lower (softer) spring rate. Match both to your design drawings or the original spring you are replacing.
Left-hand (counter-clockwise) winding means the coils wrap in the opposite direction to a right-hand spring when viewed from the leg end. If your assembly specifies a left-hand spring, or if the original spring you are replacing winds counter-clockwise, this listing is correct. Using the wrong wind direction can cause the spring to unwind under load rather than store energy.
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 your assembly's geometry. A 90° spring is common for right-angle brackets and hinges; 180° suits applications where both legs point in opposite directions; 60° and 120° cover intermediate configurations. If you are replacing an existing spring, measure the free angle of the original.
These springs are made from spring steel, which offers good mechanical properties but has limited inherent corrosion resistance compared to stainless steel. For indoor or dry environments they perform reliably. For humid, wet, or outdoor applications, consider applying a light protective coating after installation, or contact us to confirm suitability for your specific environment.
Spring steel maintains its properties well at moderate temperatures. For applications involving sustained elevated temperatures (above approximately 120°C / 250°F), the spring rate and elastic limit may be affected. Contact us to confirm suitability if your application involves heat exposure beyond normal ambient conditions.
With the same wire diameter and outer diameter, a spring with more coils has a lower spring rate — meaning it requires less force to deflect by the same angle. A 3-coil spring will be stiffer and shorter in body length, while a 9-coil spring will be more compliant and longer. Choose based on the torque and deflection requirements of your assembly.
Each order is for a pack of 10 identical springs of the selected variant (wire diameter × outer diameter, coil count, and leg angle). This makes them practical for prototyping, batch repairs, or keeping spares on hand without committing to large bulk quantities.
