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When a mechanism fails because a spring loses tension or snaps under load, the entire assembly stops working. Engineers, repair technicians, and DIY builders who need a dependable torsion spring with exact geometry know how hard it is to find the right wire diameter, outer diameter, coil count, angle, and hand orientation all in one place. This listing solves that problem with a fully configurable torsion spring built to consistent dimensional tolerances.
Each spring is wound from spring steel (Federstahl) wire with a nominal wire diameter of 1.0 mm (0.039 in). Outer diameters span 5 mm to 12 mm (approx. 0.197 in to 0.472 in), with coil counts of 3, 6, or 9 turns and a leg length of approximately ±30 mm (±1.18 in). Both left-hand (Linke Federn) and right-hand (Rechte Federn) wound versions are available, with leg angles of 60°, 90°, 120°, and 180°.
Typical applications include small appliance hinges requiring a compact torsion spring replacement, precision instrument mechanisms needing a 1mm wire torsion coil spring, and hobby or model engineering projects where a custom-angle steel torsion spring with defined leg geometry is essential.
| Wire Diameter (d) | 1.0 mm (0.039 in) |
|---|---|
| Outer Diameter (OD) | 5 mm – 12 mm (0.197 – 0.472 in) — See variant options |
| Leg Length (Ls) | Approx. ±30 mm (±1.18 in) |
| Active Coils | 3, 6, or 9 — See variant options |
| Leg Angle | 60°, 90°, 120°, or 180° — See variant options |
| Winding Direction | Left-hand (Linke Federn) / Right-hand (Rechte Federn) — See variant options |
| Material | Spring Steel (Federstahl) |
| Finish | Bare / uncoated steel |
| Spring Type | Torsion / Rotational (Dreh-Feder) |
| Inner Diameter (ID) | See variant options |
| Spring Rate | See variant options |
Measure the bore or housing your spring must fit inside, or the shaft it will wrap around. The outer diameter (OD) of the spring should be slightly smaller than the bore to allow free rotation, or sized to match your shaft's inner diameter clearance. Available ODs range from 5 mm to 12 mm in 0.5 mm steps — select the closest match from the variant dropdown.
Winding direction determines which way the spring tightens when torque is applied. A left-hand (Linke Federn) spring tightens when rotated counter-clockwise; a right-hand (Rechte Federn) spring tightens when rotated clockwise. Using the wrong hand will cause the spring to unwind rather than store energy — always match the winding direction to your mechanism's rotation.
More active coils (turns) result in a lower spring rate — the spring deflects more for the same applied torque, giving a softer feel. Fewer coils produce a stiffer spring with less angular travel per unit of torque. Choose 3 coils for a stiffer, more compact spring; 6 or 9 coils for greater angular deflection and a softer rate.
Bare spring steel offers moderate corrosion resistance suitable for indoor and dry environments. For applications exposed to moisture, humidity, or mild chemicals, consider applying a light coat of oil or grease after installation. For harsh outdoor or wet environments, contact us to confirm suitability before ordering.
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 mechanism's geometry when the spring is at rest. Common choices: 90° for right-angle brackets and hinges, 180° for flat-leg configurations, 60° or 120° for specific cam or lever arrangements. If your required angle falls between options, choose the nearest available angle and adjust your mounting geometry accordingly.
Yes, provided you match all key dimensions: wire diameter (1.0 mm), outer diameter, coil count, leg length (~30 mm), leg angle, and winding direction. Measure or note these values from your original spring before selecting a variant. If you are unsure of any dimension, contact us with photos or measurements and we can help confirm compatibility.
The leg length (Ls) is approximately ±30 mm (±1.18 in) for all variants in this listing. This is the straight tangential section extending from each end of the coil body. Standard leg lengths are fixed as listed. If you require a non-standard leg length, please contact us to discuss custom options.
