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When a mechanism fails because a spring loses its tension or snaps under repeated cycling, the root cause is almost always a mismatch between wire gauge, coil count, and operating angle. Engineers, repair technicians, and serious DIYers who need a reliable left-hand torsion spring in small diameters will find this range covers the most common specifications in a single listing.
Each pack contains 10 pieces of left-hand wound torsion springs manufactured from spring steel. Wire diameter is 0.6 mm (0.024 in). Outer diameter (OD) spans 4 mm to 7 mm (0.157 in to 0.276 in) depending on the variant selected. Coil counts range from 3 to 9 active coils, and leg angles are available in 60°, 90°, 120°, and 180°.
Typical use cases include small appliance hinges requiring left-hand torsion spring replacement, precision instrument mechanisms needing a 0.6mm wire torsion spring, and miniature door latch assemblies where a compact left-wound coil spring with a specific leg angle is critical.
Wound counter-clockwise for applications where the torque load tightens the coil — essential for correct spring function in left-hand mechanisms.
Choose from 60°, 90°, 120°, or 180° leg angles to match your existing spring geometry without bending or modifying the legs.
Wider coil count range lets you tune spring rate and angular deflection — more coils yield a softer spring; fewer coils give a stiffer response.
Made from spring steel for consistent elastic return, fatigue resistance under repeated cycling, and dimensional stability across typical operating temperatures.
Each order ships as a pack of 10 identical springs — ideal for prototyping, batch repairs, or keeping spares on hand for production maintenance.
Seven outer diameter options (4, 4.5, 5, 5.5, 6, 6.5, 7 mm) cover the most common small-diameter torsion spring sizes in a single product family.
| Wire Diameter | 0.6 mm (0.024 in) |
|---|---|
| Outer Diameter (OD) | 4 mm – 7 mm (0.157 in – 0.276 in), see variant options |
| Number of Active Coils | 3 – 9 coils, see variant options |
| Leg Angle | 60°, 90°, 120°, or 180°, see variant options |
| Wind Direction | Left-hand (counter-clockwise) |
| Material | Spring Steel |
| Surface Finish | See variant options |
| Pack Quantity | 10 pieces per pack |
| Inner Diameter (ID) | See variant options (OD minus 2× wire dia) |
| Free Length | See variant options |
Measure the mandrel or shaft the spring will sit on — the spring's inner diameter (OD minus twice the wire diameter) should be slightly larger than the shaft for a free fit, or slightly smaller for a press fit. For coil count, more coils reduce the spring rate (softer), while fewer coils increase it (stiffer). Match the coil count to the torque and angular travel your application requires.
Left-hand (counter-clockwise) winding means the coils tighten when the spring is loaded in the counter-clockwise direction. If your mechanism applies torque in the counter-clockwise direction, a left-hand spring is correct. If torque is applied clockwise, you need a right-hand spring. Using the wrong wind direction will cause the spring to unwind 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. Measure the angle between the legs of the spring you are replacing, or calculate the required free angle based on your mechanism's geometry and the angular deflection needed during operation. Common choices are 90° for right-angle brackets and 180° for inline or flat-mounted applications.
Exact torque values depend on the specific OD and coil count combination selected. Spring steel provides reliable elastic return and fatigue resistance for typical light-duty to medium-duty cycling applications. For precise torque calculations, use the spring rate formula: T = (E × d⁴) / (10.8 × D × n), where E is the modulus of elasticity for spring steel (~200 GPa), d is wire diameter, D is mean coil diameter, and n is the number of active coils. Contact us to confirm if you have specific load requirements.
Spring steel provides good mechanical properties but has limited inherent corrosion resistance compared to stainless steel. For indoor or dry environments these springs perform well. For humid, wet, or outdoor applications, consider applying a light coating of oil or grease, or contact us about alternative material options.
Yes. The 10-piece pack format is well suited for both prototyping (testing multiple coil counts or angles before committing to a design) and production maintenance (keeping a stock of replacement springs on hand). Because all 10 pieces in a pack are identical, you can validate one and deploy the rest with confidence.
The outer diameter determines the physical size of the spring coil body. A larger OD means a larger coil, which also increases the mean coil diameter and reduces the spring rate for the same wire gauge and coil count. Select the OD that fits your housing bore or mandrel. The inner diameter equals OD minus twice the wire diameter (0.6 mm × 2 = 1.2 mm), so a 4 mm OD spring has an ID of approximately 2.8 mm.
