Made to drawing or sample
Double torsion springs
Two opposite-wound coils joined by a centre loop, from one length of wire. Balanced torque on both sides. A speciality of our unit.
01 · Specification
Quick spec
| Wire diameter | Ø 0.40–2.50 mm |
|---|---|
| Outer diameter and length | Outer diameter and length as per your drawing |
| Materials |
|
| Centre loop and legs | U-shaped centre loop and legs to your drawing · LH and RH coils |
| Finishes | Plating and other finishing through partnersTell us the finish on the drawing. We do not plate in-house. |
| Minimum order | 5,000–10,000 pcsSmaller runs are possible with development or setup charges. |
| Quotation | Within 24 hours |
| Delivery | Ex-works Talawade (transport not included) |
02 · Engineering
What it is and how it works
A double torsion spring is two torsion bodies wound in opposite directions and joined by a U-shaped centre loop, from one length of wire. One coil is left-hand, the other right-hand. The loop sits on the hinge pin or bracket and the legs take the load on each side.
Because the two bodies act in parallel, the rate is about twice that of a single body with the same wire, mean diameter and number of coils. The hinge sees a balanced couple instead of a single sideways pull. That is why lids, latches and switch mechanisms so often use this layout.
It is a speciality here. Switchgear and MCB parts in the 0.40–2.50 mm wire range are regular work. The centre loop is the detail that usually decides the fit: width, inside radius and whether the loop is flat or offset.
Same materials as our other springs: hard-drawn spring steel, music wire on request, stainless 302 / 304 / 316, and oil-tempered wire.
03 · Variants
Types and ends
Variants we see on drawings: a wide centre loop that sits over a long pin; a tight loop that clips onto a bracket; legs of equal length; or one short leg and one long one when the two sides of the hinge are not the same.
If you already have a single torsion spring and it keeps walking off the pin, a double torsion with a centre loop is often the cleaner fix — one part, no pair to match.
04 · Materials
What we coil it from
Only the grades we actually buy. Tell us the environment and we will pick from this list.
| Material | Typical standard | When to choose it |
|---|---|---|
| Spring steel (hard-drawn grades) | Typical of IS 4454-1 / EN 10270-1 cold-drawn carbon wire | Everyday torsion, extension, compression and wire forms where the part stays dry and the load is not highly cyclic. |
| Music wire | Typical of ASTM A228 / IS 4454-1 grade DH | On request, for small precision springs that need a higher tensile strength than hard-drawn wire. |
| Stainless steel 302 / 304 | Typical of ASTM A313 / IS 4454-4 | Damp, outdoor or electrical work where rust on carbon steel would be a problem. |
| Stainless steel 316 | Typical of ASTM A313 Type 316 | Chlorides or chemical splash. Tell us if the spring will see salt or cleaning chemicals. |
| Oil-tempered wire | Typical of IS 4454-2 / EN 10270-2 | On request, toward the upper end of our 0.40–2.50 mm range, for general industrial use. |
05 · Design
What to put on your drawing
- 01Wire diameter
- 02Inside diameter of each coil body
- 03Number of coils on each side
- 04Centre-loop width and shape
- 05Leg length and bend on each side
- 06Free angle
- 07Torque at the working angle, if you have it
- 08Material and any finish
- 09Quantity
Dimension the centre loop the way you would a clip: inside width, radius and height off the coil axis. Then the two bodies: ID, coils, wire. Then each leg.
If the two sides must open to different angles, say so. A photo of the hinge, even without a drawing, is enough for a first quote.
06 · Use
Where this spring is used
On our factory floor the usual jobs are electrical switchgear and MCB mechanisms, small automotive latches and lids, furniture hinges, and instrumentation covers. The same geometry turns up on appliance lids and tool handles.
Agricultural tines and heavy tail-gate springs are often double torsion as well. Those are usually above our 2.50 mm wire limit, so we do not take them.
07 · Process
How we make it
Both coil bodies and the centre loop are formed from one wire, then the batch is stress-relieved. Finishing goes through partners. Dispatch is ex-works Talawade.
08 · Quote
Send this and we will quote in 24 hours
- Spring type and quantity
- Drawing, dimensioned photo, or the old spring
- Material, or where the part lives (dry, damp, outdoors)
- Any finish (plating is through partners)
09 · Questions
FAQ
What is the minimum order quantity?
How fast do you quote?
Can you copy a spring from a sample?
How is a double torsion spring different from two single ones?
What do I need to specify on the centre loop?
What wire sizes do you work with?
Do you make these for switchgear?
Request for quotation
Send your drawing or sample. Get a quote within 24 hours.
Tell us the spring type, quantity and what it has to do. Our usual minimum order is 5,000–10,000 pcs; smaller development runs are charged.