A balance torsion spring in carbon steel, made to counter the weight of a moving part so that it stays wherever it is put. Balance applications are defined by torque curve rather than by peak force, which makes them a design exercise rather than a catalogue pick.
The spring is sized so its torque tracks the changing moment of your mechanism across its travel, not just at one position.
Balance springs are often large. Carbon steel with an appropriate plating delivers the torque without the price of an alloy.
Balance springs cannot be bought off a shelf because they depend on the arm length and mass of your specific part.
Install with the spring preloaded to the angle agreed at design, not at its free angle. Balance springs are almost always fitted with an initial wind, and skipping it moves the balance point.
Covers that slam shut or drift open because the counterbalance was approximated rather than calculated
Off-the-shelf springs that balance at one position and fight the mechanism everywhere else
Dimensional and load figures are set per order against your drawing or sample, so they are marked TBC rather than filled with catalogue numbers.
| Product Type | Torsion Springs |
|---|---|
| Raw Material Options | Stainless steel, Spring steel, Carbon steel, 65Mn, Music wire |
| Wire Diameter Range | 0.1-8 mm |
| Surface Treatment Options | Zinc plating, Nickel plating, Silver plating, Gold plating, Tin plating, Galvanizing in various colours, Dacromet, Black oxide, Phosphating |
| Standard | ISO, non-standard and OEM drawings |
| Processing Route | Material sourcing → Coiling and forming → Heat treatment → Surface treatment → Quality inspection → Packing → Shipping |
| Inspection Equipment | Grinding and shot peening machinery; Precision tensile strength testers; Magnetic powder flaw detectors |
| Packing | Plastic bags, cartons or pallets, or packing to your own specification |
| Payment Terms | L/C, T/T, D/A, D/P, Western Union, 30% deposit before production, 70% balance before shipment |
| Lead Time | 7-15 days after the order is confirmed |
| Minimum Order Quantity | Quoted per part — tell us your requirement (TBC) |
| Dimensions and Load Rating | Made to your drawing or sample (TBC per part) |
Every batch follows the same seven step route, with tensile testing and magnetic powder flaw detection carried out before packing.
Available in Stainless steel, Spring steel, Carbon steel, 65Mn, Music wire, in wire from 0.1-8 mm, with any of our nine surface finishing routes. Geometry, end treatment and finish are all specified per order.
ISO 9001, SGS certificate and RoHS report (stated on the legacy site, certificates pending re-confirmation). Certificate copies are sent on request once re-confirmed.
Where a gas strut would normally be used, a balance torsion spring has no seals to fail and no gas to leak, at the cost of a less adjustable force and a bulkier pivot.
The mass being balanced, the arm length, the pivot position and the angular travel. With those four figures the required torque curve is straightforward.
Often yes, though a long travel may need the spring preloaded at the rest position. We confirm this during design.
Only when plated, and even then galvanising or dacromet should be specified. For permanently exposed mechanisms stainless is the better base material.
Send your drawing, dimensions or a sample. We will confirm the specification and come back with a price and a lead time.
