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When a hinge sticks, a lid won't stay closed, or a mechanism loses its return force, the culprit is almost always a worn or incorrectly sized torsion spring. Engineers, hobbyists, and repair technicians who need a dependable, corrosion-resistant solution turn to stainless steel torsion springs with precisely defined deflection angles and coil counts.
These torsion springs are wound from 0.3mm stainless steel wire with outer diameters ranging from 2mm to 5mm (approximately 0.079–0.197 in). Each spring is right-hand wound and available in 1 to 5 coils, with deflection angles of 45°, 60°, 90°, 120°, 180°, and 270°. The compact wire-to-OD ratio makes them suitable for tight-clearance assemblies.
Typical applications include small appliance hinges requiring a 90° torsion spring return, precision instrument latch mechanisms needing a 180° stainless torsion spring, and miniature robotics or automation components where a 0.3mm wire torsion spring with 2–3mm OD fits constrained mounting pockets.
| Material | Stainless Steel |
|---|---|
| Wire Diameter | 0.3 mm (0.012 in) |
| Outer Diameter Range | 2 mm – 5 mm (0.079 in – 0.197 in) |
| Inner Diameter Range | 1.4 mm – 4.4 mm (varies by OD variant) |
| Deflection Angle Options | 45°, 60°, 90°, 120°, 180°, 270° |
| Number of Coils | 1, 2, 3, 4, 5 |
| Winding Direction | Right-Hand (Right Spring) |
| Spring Rate | See variant options |
| Max Torque | See variant options |
| Surface Finish | Natural Stainless (no coating) |
| Operating Temperature | Typically –20°C to +200°C (–4°F to +392°F) |
Measure the mandrel or shaft the spring will wrap around. The spring's inner diameter (OD minus twice the wire diameter) should be slightly larger than the mandrel for free rotation, or a close fit if you need the spring to grip. For a 0.3×3mm spring, the inner diameter is approximately 2.4mm — suitable for a 2–2.3mm mandrel.
The deflection angle is the angular travel the spring provides from its free (unloaded) position to its loaded position. If your hinge needs to return a lid from fully open (90°) to closed, select the 90° variant. For mechanisms requiring a quarter-turn return, 90° is standard; for half-turn, choose 180°.
More coils increase angular compliance (the spring deflects more per unit of torque), making it softer for a given wire and OD. Fewer coils produce a stiffer spring. If you need a firm return force in a compact space, choose 1–2 coils. For a gentler, longer-travel return, choose 4–5 coils.
Yes. Stainless steel provides good resistance to oxidation and moisture compared to carbon steel. These springs are suitable for indoor humid environments, light outdoor exposure, and applications where occasional contact with water or mild chemicals is expected. For highly aggressive chemical environments, confirm compatibility with your specific media.
"Right Spring" indicates a right-hand winding direction. When viewed from the end where the torque is applied, the coils wind clockwise. This is the most common winding direction for standard hinge and latch applications. Ensure your assembly loads the spring in the correct rotational direction to avoid unwinding the coils.
Yes. The 0.3mm wire diameter and 2–5mm OD range make these springs well-suited for small mechanisms in precision instruments, camera components, medical device latches, and miniature robotics. Confirm the required torque and deflection angle match your mechanism's load requirements before ordering.
Inner diameter = Outer diameter − (2 × wire diameter). For a 0.3×4mm variant: ID = 4 − (2 × 0.3) = 3.4mm. Use this to verify mandrel fit. A mandrel diameter 0.1–0.2mm smaller than the ID is a typical working clearance.
