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When a hinge droops, a latch loses its snap, or a small mechanism stops returning to position, the culprit is almost always a worn or incorrectly sized torsion spring. Whether you are a hobbyist repairing a cabinet door, a maker building a custom jig, or a technician maintaining light-duty equipment, finding the exact wire diameter and outer diameter combination in one listing saves hours of searching. This listing delivers a pack of 10 right-hand wound torsion springs with a consistent 0.9 mm wire diameter and outer diameters spanning 5 mm to 10 mm (approximately 0.20 in to 0.39 in), so you can select the precise fit for your application.
Each spring is formed from carbon steel wire with a diameter of 0.9 mm (approx. 0.035 in). Outer diameters range from 5 mm to 10 mm (0.20 in – 0.39 in) depending on the variant selected. Coil counts run from 3 to 9 active coils, and leg angles are available in 60°, 90°, 120°, and 180° to match a wide variety of mounting geometries. The right-hand wind direction means the spring tightens when rotated clockwise when viewed from the leg end.
Typical use cases include replacement torsion springs for cabinet hinges and door closers, return springs in small levers and latches for DIY home repair, and precision coil springs for maker projects, robotics, and light-duty mechanical assemblies requiring consistent rotational force.
Consistent wire gauge across all variants ensures predictable spring rate and reliable torque output for light-to-medium duty applications.
Eleven outer diameter options from 5 mm to 10 mm (0.20 in – 0.39 in) in 0.5 mm increments let you match the spring to your housing or shaft without modification.
Clockwise winding tightens the spring under standard rotational loads — the correct choice for the majority of hinge, latch, and lever return applications.
Choose 60°, 90°, 120°, or 180° leg angles to suit your mounting bracket geometry without bending or modifying the spring legs.
Ten springs per pack means you have spares on hand for iterative prototyping, batch repairs, or future replacements without reordering.
Select the coil count that delivers the angular deflection and torque your application requires — more coils allow greater angular travel before reaching the elastic limit.
| Wire Diameter | 0.9 mm (approx. 0.035 in) |
|---|---|
| Outer Diameter (OD) | 5 mm – 10 mm (0.20 in – 0.39 in) — see variant options |
| Inner Diameter (ID) | OD minus 1.8 mm — see variant options |
| Number of Active Coils | 3, 4, 5, 6, 7, 8, or 9 — see variant options |
| Leg Angle | 60°, 90°, 120°, or 180° — see variant options |
| Wind Direction | Right-hand (clockwise) |
| Material | Carbon steel wire |
| Surface Finish | Bright / uncoated |
| Quantity per Pack | 10 pieces |
| Spring Rate | See variant options (varies by OD and coil count) |
Measure the bore or housing your spring will sit in, then select an OD that is slightly smaller to allow free rotation. Also check the inner diameter (OD − 1.8 mm for 0.9 mm wire) to ensure it clears your shaft or arbor. If the spring must fit inside a tube, the OD should be at least 0.5 mm smaller than the tube's inner diameter.
Right-hand (clockwise) winding means the spring coils tighten when the leg is rotated clockwise when viewed from the front leg end. This is the most common direction for hinges, door closers, and return mechanisms. If your application requires the spring to tighten counter-clockwise, you would need a left-hand wound spring instead.
The leg angle is the angle between the two straight legs of the spring when it is in its free (unloaded) state. Match this to the angle between your two mounting points. For example, if your bracket has two tabs at 90° to each other, select the 90° variant. If the legs need to be parallel and pointing in opposite directions, choose 180°.
More active coils allow greater angular deflection before the spring reaches its elastic limit, and they also reduce the spring rate (making the spring softer for a given wire and OD). If you need a large range of motion (e.g., a door that swings 90°+), choose more coils. For short-travel, stiffer return applications, fewer coils are appropriate. When in doubt, 5–6 coils is a versatile starting point for most light-duty DIY uses.
These springs are made from bright carbon steel wire without a protective coating, which means they can develop surface rust if exposed to moisture or outdoor conditions over time. For outdoor or high-humidity applications, consider applying a light coat of oil or grease, or look for stainless steel torsion springs. For indoor, dry-environment use, these springs perform reliably without additional treatment.
Yes — 0.9 mm wire torsion springs in the 5–10 mm OD range are well suited for light-duty cabinet hinges, small door closers, lid return mechanisms, and similar applications. Select the OD that fits your hinge pin diameter, choose the leg angle that matches your bracket geometry, and pick a coil count that provides the desired closing force. The pack of 10 gives you extras for testing different configurations.
Having 10 springs on hand lets you test multiple configurations during prototyping, replace worn springs across several identical mechanisms at once, and keep spares for future maintenance without waiting for a reorder. For repair technicians and makers, bulk packs reduce per-unit cost and downtime.
