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When a hinge sticks, a lid won't stay open, or a small mechanism loses its return force, the culprit is almost always a worn or incorrectly sized torsion spring. Engineers, repair technicians, and hands-on DIYers who need a reliable rotational force solution will find this pack of 10 torsion springs an indispensable addition to their parts inventory.
Each spring in this pack is wound from 1mm diameter wire and is available in outer diameters ranging from 5mm to 12mm (approximately 0.20 in to 0.47 in). Coil counts span 3 to 9 turns, and leg angles are offered in 60°, 90°, 120°, and 180° configurations. The right-hand wind direction means the spring tightens when rotated clockwise. Material is spring steel, typically finished with a natural or lightly oiled surface to resist surface oxidation during storage and use.
Typical applications include small appliance hinges, electronic enclosure latches, automotive interior clips, hobby robotics joints, and precision instrument return mechanisms — anywhere a compact torsion spring for small mechanisms is required. The wide size matrix makes it straightforward to find the exact wire-diameter-to-OD ratio needed for a snug mandrel fit.
Consistent 1mm wire gauge across all variants ensures uniform spring rate calculations and predictable torque output for compact mechanism design.
Thirteen outer diameter options from 5mm to 12mm (≈0.20–0.47 in) let you match the spring to your mandrel without compromise.
Clockwise-wound coils tighten under clockwise torque — the standard orientation for the majority of hinge and latch return applications.
Ten springs per order means you have spares on hand for prototyping, batch repairs, or production runs without reordering delays.
Choose from 60°, 90°, 120°, or 180° leg angles to match your assembly geometry without bending or modifying the spring legs.
More coils increase angular deflection capacity and reduce spring rate — select the coil count that matches your required travel and torque.
| Wire Diameter | 1 mm (0.039 in) |
|---|---|
| Outer Diameter (OD) | 5 mm – 12 mm (0.20 in – 0.47 in) |
| Number of Coils | 3, 4, 5, 6, 7, 8, or 9 coils (see variant options) |
| Leg Angle | 60°, 90°, 120°, or 180° (see variant options) |
| Wind Direction | Right-hand (clockwise) |
| Material | Spring steel |
| Surface Finish | See variant options |
| Quantity per Pack | 10 pieces |
| Inner Diameter | OD minus 2× wire diameter (varies by variant) |
| Free Angle | See variant options |
Measure the mandrel (shaft or pin) your spring will sit on. The spring's inner diameter — which equals the outer diameter minus twice the wire diameter (OD − 2 × 1mm) — should be slightly larger than the mandrel for a free-rotating fit, or slightly smaller for a press fit. For example, a 1 × 8mm variant has an inner diameter of approximately 6mm.
The leg angle is the angle between the two straight legs of the spring when it is in its free (unloaded) state. A 90° spring has legs at a right angle; a 180° spring has legs pointing in opposite directions. Choose the angle that matches your assembly geometry so the legs seat correctly without pre-stressing the spring at installation.
More coils lower the spring rate (less torque per degree of deflection) and increase the maximum angular travel before the spring reaches its elastic limit. Fewer coils produce a stiffer spring with higher torque per degree. 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.
These springs are made from spring steel with a standard surface treatment suitable for indoor and protected environments. For applications exposed to moisture, chemicals, or outdoor conditions, consider applying a light coat of corrosion-inhibiting oil or grease, or contact us to confirm whether a stainless steel alternative is available for your size.
These are right-hand (clockwise) wound springs. When viewed from the front, the coils wind clockwise from the body toward the leg. The spring tightens — storing energy — when the legs are rotated clockwise relative to each other. If your mechanism requires a counter-clockwise (left-hand) wind, this variant is not suitable; please contact us for left-hand options.
Yes. Each order includes 10 springs of the same specification, making this pack well-suited for small production runs, repair kits, or prototyping where having spare units on hand avoids project delays. For larger quantities, contact us to discuss bulk pricing.
Before installing, check three dimensions: (1) inner diameter vs. mandrel diameter, (2) leg angle vs. your assembly's resting geometry, and (3) overall coil length (number of coils × wire diameter) vs. available axial space. Because each pack contains 10 springs, you can test fit one unit before proceeding with the full repair or assembly.
