Your payment information is processed securely. We do not store credit card details nor have access to your credit card information.
When a worn or undersized torsion spring causes your mechanism to bind, slip, or fail to return, finding the exact replacement geometry is the real challenge. These left-hand leg springs are designed for engineers, repair technicians, and precision DIYers who need a specific wire diameter, outer diameter, coil count, and deflection angle — all in one configurable pack of 5.
Each spring is formed from 0.5mm (≈0.020 in) stainless steel wire with an outer diameter ranging from 4mm to 8mm (approximately 5/32 in to 5/16 in). The body features 1 to 5 tightly wound coils with a left-hand (counterclockwise) winding direction, and the legs are set at deflection angles of 45°, 60°, 90°, 120°, 180°, or 270° to match your application geometry.
Typical use cases include small appliance return mechanisms, instrument panel latches, pen clip assemblies, miniature hinge preloading, and precision clockwork or sensor-arm return springs — anywhere a compact left-hand torsion spring with a defined angular load is required.
| Wire Diameter | 0.5mm (≈0.020 in) |
|---|---|
| Outer Diameter (OD) | 4mm / 4.5mm / 5mm / 6mm / 6.5mm / 7mm / 8mm |
| Winding Direction | Left-hand (counterclockwise) |
| Number of Coils | 1 / 2 / 3 / 4 / 5 |
| Leg Angle | 45° / 60° / 90° / 120° / 180° / 270° |
| Material | Stainless Steel |
| Surface Finish | Natural (uncoated) |
| Spring Rate | See variant options |
| Inner Diameter (ID) | See variant options |
| Free Leg Length | See variant options |
| Pack Quantity | 5 pieces |
The outer diameter (OD) should be selected so the spring fits freely over your shaft or inside your bore with minimal clearance. Measure the shaft diameter and choose the next available OD size up (e.g., a 3.8mm shaft typically suits a 4mm OD spring). If the spring sits inside a bore, the OD must be smaller than the bore diameter. Available ODs are 4, 4.5, 5, 6, 6.5, 7, and 8mm.
The number of active coils directly influences the angular spring rate — the torque required per degree of deflection. Fewer coils produce a stiffer spring (higher torque per degree), while more coils produce a softer spring (lower torque per degree) for the same wire and OD. Choose 1–2 coils for firm return force and 4–5 coils for lighter, more gradual return.
The leg angle is the angular position of the two spring legs relative to each other in the free (unloaded) state. A 90° spring has its legs at a right angle; a 180° spring has them pointing in opposite directions. Select the angle that matches your assembly's geometry so the spring is at or near its free position when installed, allowing it to exert force in the correct direction when deflected.
Yes. These springs are made from stainless steel wire, which provides good resistance to rust and oxidation in humid, wet, and mildly corrosive environments. They are suitable for outdoor mechanisms, marine-adjacent applications, and food-adjacent equipment where carbon steel springs would corrode. For highly aggressive chemical environments, confirm compatibility with your specific media.
Left-hand (LH) springs are wound counterclockwise when viewed from the front. They are designed to be loaded by rotating the leg in the counterclockwise direction. Right-hand (RH) springs are wound clockwise. Using the wrong winding direction will cause the spring to unwind rather than store energy, leading to failure. These springs are left-hand only — confirm your application requires LH winding before ordering.
Yes, provided you match all key parameters: wire diameter (0.5mm), outer diameter, number of coils, leg angle, and winding direction. Measure your original spring carefully or consult the equipment's service manual for the spring specification. If the original spring is deformed, measure the coil body OD and count the coils while the spring is relaxed.
Torsion springs in this size range are commonly used in multiples (e.g., both sides of a hinge, multiple positions in an assembly) or require replacement in sets. Having spares on hand avoids downtime if a spring is lost during installation or fails during testing. For prototyping and repair work, a pack of 5 provides the flexibility to iterate without reordering.
