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When a worn-out torsion spring causes your clamp, hinge, or precision mechanism to lose its return force, finding the exact replacement spec matters. Engineers, repair technicians, and DIY builders who need a reliable small torsion spring with a specific wire diameter, outer diameter, coil count, and rotation angle will find this listing covers an extensive range of configurations in one place.
Each small torsion spring in this listing features a 0.4mm wire diameter and an outer diameter (OD) ranging from 2mm to 6mm (approximately 0.079 in to 0.236 in), with coil counts of 3, 6, or 9 turns. Springs are available in both left-hand (rotate left) and right-hand (rotate right) wind directions, and in four standard leg angles: 60°, 90°, 120°, and 180°.
Typical use cases include small clamp spring replacement for tool clips and binder mechanisms, torsion spring for hinge assemblies in electronics enclosures and cabinetry, and precision return-spring applications in medical devices, instrumentation, and hobby robotics where a compact 0.4mm wire torsion spring with controlled leg angle is required.
Consistent 0.4mm wire gauge across all variants ensures predictable spring rate and reliable return force for compact mechanisms.
Outer diameters from 2mm to 6mm (in 0.5mm increments) cover a broad spectrum of small clamp spring and hinge spring applications.
Choose 3, 6, or 9 active coils to match your required spring rate and deflection range without custom fabrication.
Standard leg angles cover the most common torsion spring configurations for clamps, latches, hinges, and return mechanisms.
Both rotate-left and rotate-right wind directions available, ensuring correct torque orientation for your specific assembly.
Uniform coil pitch and close-wound body maintain dimensional accuracy, supporting repeatable performance in precision instruments and DIY repairs.
| Wire Diameter | 0.4 mm (0.016 in) |
|---|---|
| Outer Diameter (OD) | 2 mm – 6 mm (0.079 in – 0.236 in) |
| Inner Diameter (ID) | 1.2 mm – 5.2 mm (approx.) |
| Active Coils | 3 / 6 / 9 turns (see variant options) |
| Leg Angle | 60° / 90° / 120° / 180° (see variant options) |
| Wind Direction | Rotate Left (LH) / Rotate Right (RH) |
| Material | See variant options |
| Surface Finish | See variant options |
| Spring Rate | See variant options |
| Free Angle | See variant options |
| Quantity per Order | 1 piece |
Measure the mandrel or shaft diameter your spring will wrap around. The spring's inner diameter (ID = OD minus twice the wire diameter) should be slightly larger than the shaft for free rotation, or match it closely for a snug fit. For a 0.4mm wire spring, ID ≈ OD − 0.8mm. Select the OD variant that gives you the correct ID for your assembly.
More active coils result in a lower spring rate (softer spring) and greater angular deflection capacity before reaching the elastic limit. Fewer coils produce a stiffer spring with less deflection range. Choose 3 coils for stiff, short-travel applications; 6 or 9 coils for softer return force or larger angular travel requirements.
Wind direction determines which way the spring tightens when torque is applied. A left-hand (rotate left) spring tightens when the torque is applied counterclockwise; a right-hand (rotate right) spring tightens clockwise. Check your original spring or assembly drawing to confirm the correct wind direction before ordering.
The leg angle is the angle between the two straight legs of the torsion spring in its free (unloaded) state. Match this to your original spring or the geometry of your mechanism. A 90° angle is the most common for hinge and clamp applications; 180° is typical for flat-leg configurations; 60° and 120° suit specific cam or lever assemblies.
Corrosion resistance depends on the material and surface finish of the specific variant. Please contact us to confirm the material specification for your chosen variant before use in outdoor, humid, or chemically exposed environments. For critical applications, consider requesting a stainless steel or coated option.
Yes, provided you match all key parameters: wire diameter (0.4mm), outer diameter, active coil count, leg angle, and wind direction. Measure your original spring carefully or refer to the equipment's parts list. If any parameter differs, the spring may not fit or may not deliver the correct return force.
Each order includes 1 piece of the selected torsion spring variant. If you require multiple pieces, simply adjust the quantity in your cart before checkout.
