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When a hinge sticks, a door fails to return, or a mechanical assembly loses its snap, the culprit is almost always a worn or mismatched torsion spring. Engineers, makers, and repair technicians who need a dependable rotational spring in a compact form will find this stainless steel torsion spring series built to exacting tolerances for consistent performance across repeated cycles.
Each spring is wound from 1.2mm stainless steel wire with an outer diameter ranging from 8mm to 15mm (approximately 0.31" to 0.59"). The body length varies with coil count, from 1 coil to 5 coils, and the leg angle spans 45° to 270° in both left-hand (LH) and right-hand (RH) wind orientations. The stainless steel construction provides corrosion resistance suitable for indoor and light outdoor environments.
Typical applications include cabinet door return mechanisms, small appliance assemblies, electronic enclosure latches, DIY robotics and automation projects, and precision instrument housings where a compact torsion spring with a defined rotation angle is required.
| Material | Stainless Steel |
|---|---|
| Wire Diameter | 1.2 mm (0.047") |
| Outer Diameter | 8 mm / 10 mm / 12 mm / 15 mm (0.31" / 0.39" / 0.47" / 0.59") |
| Leg Angle | 45° / 60° / 90° / 120° / 180° / 270° |
| Number of Coils | 1 / 2 / 3 / 4 / 5 |
| Wind Direction | Left Spring (LH) / Right Spring (RH) |
| Spring Rate | See variant options |
| Free Angle | See variant options |
| Surface Finish | Natural Stainless (no coating) |
| Recommended Shaft Diameter | See variant options |
Measure the shaft or mandrel your spring will wrap around. The spring's inner diameter (OD minus twice the wire diameter) should be slightly larger than the shaft diameter to allow free rotation. For example, a 1.2x8mm spring has an inner diameter of approximately 5.6mm (8mm − 2×1.2mm), suitable for shafts up to about 5mm.
Wind direction determines which way the spring tightens when torque is applied. A left-hand (LH) spring tightens when rotated counterclockwise; a right-hand (RH) spring tightens when rotated clockwise. Always match the wind direction to the rotation direction of your mechanism to ensure the spring loads correctly rather than unwinding.
More coils generally result in a lower spring rate (softer spring) and greater angular deflection capacity for the same wire and diameter. Fewer coils produce a stiffer spring with less total travel. Choose a higher coil count if you need a gentler return force over a wider angle, or fewer coils for a firmer, more compact spring.
The leg angle is the angle between the two straight legs of the spring in its free (unloaded) state. Select the angle that matches your assembly's geometry so the legs seat correctly against their stops without pre-stressing the spring beyond its design range. Common choices: 90° for right-angle brackets, 180° for flat-mounted hinges, 270° for over-center mechanisms.
Stainless steel offers good corrosion resistance for indoor and light outdoor use, including humid workshops, enclosures, and covered outdoor fixtures. For harsh marine or chemical environments, verify the specific stainless grade meets your corrosion requirements. These springs are not coated, so the natural stainless surface is the only protection.
Standard stainless steel torsion springs are suitable for typical ambient temperatures found in most mechanical and DIY applications. For elevated-temperature environments (above approximately 150°C / 300°F), the spring rate may change and the material may lose temper over time. Contact us to confirm suitability for your specific temperature range.
Measure your existing spring's wire diameter, outer diameter, number of active coils, leg angle, and wind direction. Cross-reference each measurement with the variant options above. If you are unsure, photograph the spring next to a ruler and contact us — we are happy to help identify the correct replacement.
