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When a mechanism fails because a worn or incorrectly specified torsion spring snaps under load, the entire assembly stops working. Engineers, maintenance technicians, and precision DIY builders who need a reliable left-hand torsion spring with exact angular and coil specifications will find this range covers the most common requirements in a single listing.
Each spring is manufactured from stainless steel wire with a nominal wire diameter of 1.5 mm (0.059 in) and an outer diameter ranging from 10 mm to 18 mm (0.39 in – 0.71 in). Free length is 60 mm (2.36 in). Coil counts available are 1 through 5, and rotation angles span 45°, 60°, 90°, 120°, 180°, and 270°, all wound in the left-hand (counter-clockwise) direction.
Typical use cases include replacement torsion springs for cabinet hinges and door-return mechanisms, precision instrument assemblies requiring controlled angular preload, and custom jig or fixture builds where a left-hand torsion spring for machinery or automation equipment is specified by the design engineer.
| Wire Diameter | 1.5 mm (0.059 in) |
|---|---|
| Outer Diameter (OD) | 10 mm – 18 mm (0.39 in – 0.71 in) |
| Free Length | 60 mm (2.36 in) |
| Coil Count | 1 / 2 / 3 / 4 / 5 (see variant options) |
| Rotation Angle | 45° / 60° / 90° / 120° / 180° / 270° |
| Wind Direction | Left-hand (counter-clockwise) |
| Material | Stainless Steel |
| Surface Finish | Bright / natural stainless |
| Spring Rate | See variant options |
| End / Leg Style | Straight legs (tangential) |
| Weight | See variant options |
The outer diameter (OD) of the torsion spring should be slightly smaller than the bore or housing it sits in, and the inner diameter (ID = OD minus twice the wire diameter) must clear the shaft or mandrel it wraps around. For a 1.5 mm wire spring, the ID equals OD minus 3 mm. Measure your shaft diameter and housing bore, then select the OD that provides a small clearance on both sides.
The number of active coils directly determines the spring rate (torque per degree of deflection) and the total angular travel before the spring reaches its solid height. More coils = lower spring rate and greater angular travel for the same wire and diameter. Match the coil count to your required torque and the angular deflection your mechanism needs. If you have a torque specification, compare it against the spring rate for each coil count option.
The leg angle defines the angular position of the two straight legs relative to each other when the spring is in its free (unloaded) state. Choosing the correct leg angle means the spring legs align with your mounting features without requiring field bending, which can weaken the spring. Select the angle that matches the geometry of your assembly in its neutral position.
These springs are made from stainless steel, which provides good resistance to oxidation and mild corrosion in indoor and moderately humid conditions. For continuously wet, salt-spray, or fully outdoor exposed environments, additional protective measures or a higher-grade stainless alloy may be advisable. Contact us to confirm suitability for your specific environment.
A left-hand (LH) torsion spring is wound counter-clockwise when viewed from the front. When torque is applied in the counter-clockwise direction, the coils tighten and the spring stores energy. A right-hand (RH) spring works in the opposite direction. Using the wrong wind direction in your application will cause the spring to unwind rather than store energy, resulting in no return force. All springs in this listing are left-hand wound.
Yes, provided you match all key parameters of the original spring: wire diameter (1.5 mm), outer diameter, free length (60 mm), coil count, leg angle, and wind direction (left-hand). Measure or reference the original spring's specifications before selecting a variant. If the original spring's free length or leg geometry differs, this listing may not be a direct drop-in replacement.
Use a digital caliper to measure: (1) wire diameter — should be 1.5 mm; (2) outer diameter of the coil body; (3) free length from end of one leg to end of the other, or coil body length if legs are excluded; (4) count the active coils; (5) measure the angle between the two legs in the free state; (6) confirm wind direction by looking at the coil from the front — counter-clockwise = left-hand. Match all six values to the variant options above.
