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When a mechanism fails because a spring loses tension, corrodes, or snaps under load, the entire assembly stops working. Engineers, repair technicians, and DIY builders who need a dependable rotational spring for compact mechanisms will find these 304 stainless steel torsion springs built to perform across a wide range of applications.
Each torsion spring is wound from 0.6mm diameter wire with an outer diameter ranging from 4mm to 8mm (approximately 0.16" to 0.31") and a free length of 30mm (approximately 1.18"). Available in right-hand winding with 1 to 5 coils, and leg angles from 45° to 270°, these springs are manufactured from 304 stainless steel for consistent mechanical properties and corrosion resistance.
Typical use cases include small appliance mechanisms requiring a torsion spring for door latches or hinges, precision instrument assemblies needing a compact right-hand torsion spring, and electronics or hobby robotics projects where a miniature stainless steel torsion spring provides reliable return force.
| Material | 304 Stainless Steel |
|---|---|
| Wire Diameter (d) | 0.6mm (0.024") |
| Outer Diameter (Øa) | 4mm – 8mm (0.16" – 0.31") |
| Free Length (Ls) | 30mm (1.18") |
| Wind Direction | Right-Hand (Clockwise) |
| Number of Coils | 1 / 2 / 3 / 4 / 5 (see variant options) |
| Leg Angle | 45° / 60° / 90° / 120° / 180° / 270° (see variant options) |
| Finish | Natural (uncoated stainless steel) |
| Weight | See variant options |
| Quantity per Order | 1 piece |
Measure the shaft or mandrel your spring will wrap around. The inner diameter of the spring (outer diameter minus twice the wire diameter) should be slightly larger than the shaft for a free fit, or slightly smaller if you need a press fit. For this spring, inner diameters range from approximately 2.8mm to 6.8mm depending on the outer diameter variant selected.
The leg angle is the angle between the two straight legs (arms) of the torsion spring when it is in its free (unloaded) state. Common angles are 90° for right-angle assemblies, 180° for parallel-leg designs, and 270° for wrap-around configurations. Select the angle that matches the geometry of your mechanism in its neutral position.
More coils generally result in a lower spring rate (softer spring), meaning less torque is required to deflect the spring by a given angle. Fewer coils produce a stiffer spring with a higher torque output per degree of deflection. Choose 1–2 coils for stiffer, higher-torque applications and 4–5 coils for softer, lower-torque requirements.
304 stainless steel offers good corrosion resistance in most atmospheric and mildly corrosive environments, including exposure to moisture and humidity. It is not recommended for prolonged immersion in saltwater or highly acidic/alkaline conditions. For marine or highly corrosive environments, 316 stainless steel would be a more appropriate choice.
A right-hand wound spring coils in a clockwise direction when viewed from the end. The wind direction determines which direction the spring tightens (winds up) when torque is applied. Right-hand springs are the most common standard. If your application requires the spring to tighten when rotated counter-clockwise, you would need a left-hand wound spring. All variants in this listing are right-hand wound.
Yes. The small wire diameter (0.6mm) and compact outer diameters (4–8mm) make these springs well-suited for precision instruments, small appliances, hobby robotics, and electronics assemblies where space is limited and consistent return force is required. The 304 stainless steel material also ensures non-magnetic properties suitable for sensitive electronic environments.
Use the variant selectors above to choose your required leg angle (45°–270°), wire-to-outer-diameter combination (e.g., 0.6×4mm, 0.6×5mm, etc.), and number of coils (1–5). If you are unsure which combination suits your application, contact us with your mechanism dimensions and required torque and we will assist you in selecting the correct spring.
