Your payment information is processed securely. We do not store credit card details nor have access to your credit card information.
When a generic spring fails mid-project, it can mean a broken mechanism, a wasted afternoon, or a safety risk. Engineers, makers, and repair technicians who need a torsion spring with an exact leg angle, coil count, and outer diameter know how frustrating it is to find the right spec. These stainless steel torsion springs are available in a wide matrix of configurations so you can match your application precisely — no guesswork, no compromise.
Each spring is wound from 0.4mm stainless steel wire with an outer diameter ranging from 3mm to 6mm (approximately 0.12 in to 0.24 in). Leg angles span 45°, 60°, 90°, 120°, 180°, and 270°, and coil counts run from 1 to 5 — all in a left-hand wind. Springs are sold in packs of 5.
Typical use cases include small mechanism returns in electronics enclosures, door latch and hinge assemblies requiring a defined return angle, precision instrument components needing a torsion spring for consistent rotational force, and DIY repair of appliances, toys, or hobby equipment where a specific leg angle is critical.
| Wire Diameter | 0.4 mm |
|---|---|
| Outer Diameter (OD) | 3 mm – 6 mm (see variant options) |
| Leg Angle | 45° / 60° / 90° / 120° / 180° / 270° (see variant options) |
| Number of Coils | 1 / 2 / 3 / 4 / 5 (see variant options) |
| Wind Direction | Left-hand (counterclockwise) |
| Material | Stainless Steel |
| Surface Finish | Bright / natural stainless |
| Pack Quantity | 5 pieces per order |
| Spring Rate | See variant options |
| Free Angle | See variant options |
The outer diameter (OD) should be selected based on the bore or housing your spring sits in. The spring's OD must be smaller than the bore to allow free rotation. For shaft-mounted springs, the inner diameter (OD minus twice the wire diameter) must clear the shaft. With a 0.4mm wire, the inner diameter is OD minus 0.8mm — for example, a 3mm OD spring has an inner diameter of approximately 2.2mm.
The leg angle is the angle between the two straight legs of the spring when it is in its free (unloaded) state. When the spring is installed and deflected, it stores energy and returns to this angle. Choose an angle that matches the geometry of your mechanism — for example, a 90° spring suits a right-angle return latch, while a 180° spring suits a flat-open door hinge return.
More coils mean the spring can deflect through a greater angle before reaching its elastic limit, and it stores more energy at a given deflection. Fewer coils produce a stiffer spring for the same wire and diameter. If your application requires a large angular travel, choose more coils. If you need a firm, short-travel return, fewer coils are appropriate.
Yes. These springs are made from stainless steel, which provides good resistance to rust and oxidation in humid, wet, and mildly corrosive environments. For highly aggressive chemical environments, confirm the specific stainless grade meets your requirements before ordering.
Left-hand wind means the coils spiral counterclockwise when viewed from the leg end. A left-hand spring tightens (winds up) when the shaft rotates clockwise, and loosens when it rotates counterclockwise. If your mechanism requires the spring to tighten in the opposite direction, you would need a right-hand wound spring. All variants in this listing are left-hand wind only.
Yes. The small wire diameter (0.4mm) and fine OD range (3–6mm) make these springs well-suited for compact mechanisms in electronics enclosures, precision instruments, and hobby robotics. The stainless steel construction avoids magnetic interference issues associated with carbon steel springs in sensitive electronic environments.
Having 5 springs per order is practical for prototyping (test multiple configurations), batch production (install across multiple units), and maintenance stock (replace worn springs quickly without reordering). For small springs at this size, having spares on hand avoids project delays.
