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When a standard spring fails mid-project — snapping under load, corroding in a damp environment, or simply not matching the required rotation angle — the whole assembly suffers. Whether you are a mechanical engineer specifying components, a hobbyist repairing a cabinet hinge, or a maintenance technician replacing worn hardware, having the exact torsion spring geometry on hand is critical. These 304 stainless steel torsion springs are engineered for repeatable, reliable torque delivery across a wide range of angles and coil counts.
Each spring is formed from 0.55 mm (0.022 in) stainless steel wire wound into a tight helical coil body. Outer diameters span 4 mm to 8 mm (approximately 0.16 in to 0.31 in), covering a broad range of shaft and bore sizes. Available rotation angles include 45°, 60°, 90°, 120°, 180°, and 270°, with coil counts from 1 to 5, all in right-hand (clockwise) winding direction.
Typical use cases include door and cabinet latch mechanisms requiring a 90° return spring, electronic enclosure lid hinges needing a 180° torsion spring, precision instrument assemblies using a 45° or 60° micro-spring, and light-duty automotive or appliance components where a 270° right-hand torsion spring provides smooth, controlled return force.
| Material | 304 Stainless Steel |
|---|---|
| Wire Diameter | 0.55 mm (0.022 in) |
| Outer Diameter | 4 mm / 4.5 mm / 5 mm / 6 mm / 6.5 mm / 7 mm / 8 mm (0.16–0.31 in) |
| Rotation Angle | 45° / 60° / 90° / 120° / 180° / 270° |
| Number of Coils | 1 / 2 / 3 / 4 / 5 |
| Winding Direction | Right-hand (clockwise) |
| Spring Rate | See variant options |
| Free Angle | See variant options |
| Surface Finish | Natural stainless (no coating) |
| Operating Temperature | Typically –20°C to +200°C (–4°F to +392°F) |
| Quantity per Order | 1 piece |
Measure the shaft or pin that the spring will wrap around. The spring's inner diameter (outer diameter minus twice the wire diameter) should be slightly larger than the shaft for a free fit, or slightly smaller for a press fit. For a 4 mm outer diameter spring with 0.55 mm wire, the inner diameter is approximately 2.9 mm. Use the outer diameter selector above to match your shaft size.
More coils increase the spring's angular deflection capacity and reduce stiffness (lower spring rate), allowing greater rotation under the same load. Fewer coils produce a stiffer spring with less travel. Select a higher coil count if you need a softer, longer-travel spring, or a lower coil count for a firmer, shorter-travel response.
Yes. 304 stainless steel offers solid resistance to atmospheric corrosion, moisture, and mild chemical exposure without requiring additional coating. It is suitable for outdoor enclosures, marine-adjacent environments, and food-adjacent applications. For highly aggressive salt-spray or chloride-rich environments, 316 stainless steel would be a stronger choice.
The rotation angle refers to the angular displacement between the spring's two legs in the free (unloaded) state. A 90° spring has its legs perpendicular to each other; a 180° spring has its legs pointing in opposite directions. Choose the angle that matches the geometry of your mechanism so the spring is neither pre-stressed nor under-loaded at its neutral position.
Not directly. Right-hand and left-hand torsion springs wind in opposite directions and are designed to work with rotation in specific directions. Substituting one for the other will cause the spring to unwind rather than store energy. All variants in this listing are right-hand (clockwise) winding only.
The compatible shaft diameter is approximately equal to the inner diameter of the spring (outer diameter minus twice the wire diameter). For example, a 0.55x6mm spring has an inner diameter of approximately 4.9 mm, suitable for shafts up to about 4.8 mm. Refer to the outer diameter you select and subtract 1.1 mm (2 × 0.55 mm wire) to estimate the inner bore.
Each order includes 1 piece. If you need multiple springs for a project, simply increase the quantity in your cart before checkout.
