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When a worn or undersized torsion spring causes your gear lever, hinge, or small mechanism to lose its snap and return force, finding the exact replacement can be frustrating. These 304 stainless steel torsion springs are engineered for engineers, hobbyists, and repair technicians who need a reliable, corrosion-resistant spring in a compact form factor — available in a wide matrix of angles, outer diameters, and coil counts so you can match your application precisely.
Each spring is formed from 0.8mm diameter 304 stainless steel wire, with outer diameters ranging from 5mm to 10mm (approximately 0.20 in to 0.39 in). Leg angles span 45°, 60°, 90°, 120°, 180°, and 270°, and coil counts of 1 through 5 (right-hand wind) are available, giving you fine control over torque output and deflection range.
Typical use cases include small gear lever return springs in power tools and automotive accessories, hinge tension springs for enclosure lids and instrument panels, and precision mechanism reset springs in robotics, jigs, and electronic assemblies — all scenarios where a compact torsion spring with consistent stainless steel corrosion resistance is essential.
| Material | 304 Stainless Steel |
|---|---|
| Wire Diameter | 0.8 mm (0.031 in) |
| Outer Diameter | 5 mm / 6 mm / 7 mm / 8 mm / 9 mm / 10 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 | Right-hand (clockwise) |
| Surface Finish | Natural stainless (no coating) |
| Spring Rate | See variant options |
| Max Operating Temp | Typically up to 300°C (572°F) for 304 SS |
| Corrosion Resistance | Good — suitable for dry and mildly humid environments |
The outer diameter should be slightly smaller than the bore or housing it sits in, and the inner diameter (outer dia minus 2× wire dia) should be slightly larger than the shaft it wraps around. For a 0.8mm wire spring: inner dia = outer dia − 1.6mm. For example, a 0.8×8mm spring has an inner diameter of approximately 6.4mm, suitable for a 6mm shaft with clearance.
The leg angle is the angle between the two straight legs of the spring when it is in its free (unloaded) state. Choose an angle that matches the geometry of your mechanism at rest. For example, a 90° spring is common for hinges that open to a right angle, while a 180° spring suits applications where both legs point in opposite directions.
More coils lower the spring rate (softer spring, more angular travel before reaching a given torque) and allow greater deflection before yielding. Fewer coils produce a stiffer spring with less angular travel. If you need a gentle return force over a wide angle, choose more coils; for a firm snap-back over a small angle, choose fewer coils.
304 stainless steel offers good tensile strength and fatigue resistance for light-to-medium duty torsion spring applications such as gear levers, instrument panel latches, and small mechanism resets. For heavy-duty or high-cycle industrial applications, consider whether a higher-grade spring steel or 316 SS may be more appropriate for your load requirements.
304 stainless steel provides good corrosion resistance in dry and mildly humid indoor environments. It resists oxidation and light moisture exposure. However, it is not recommended for continuous immersion in saltwater or highly corrosive chemical environments — for those conditions, 316 stainless steel would be a better choice.
These springs can handle light outdoor exposure (covered or sheltered installations) due to the corrosion resistance of 304 stainless steel. For prolonged direct outdoor exposure to rain, salt air, or humidity, we recommend inspecting periodically and considering a protective coating or upgrading to 316 SS for extended service life.
Measure your existing spring or housing: (1) outer diameter of the spring coil body, (2) shaft diameter the spring wraps around, (3) free leg angle, and (4) number of coils. Match these to the variant options above. If you are unsure, contact us with your measurements and we can help confirm the correct variant.
