A heavy 5 mm wire torsion spring, chrome plated, for chair tilt and recliner mechanisms that carry body weight. At this wire size the spring is structural rather than incidental, and the chrome finish suits mechanisms that are partly visible under the seat.
5 mm wire puts this part at the heavy end of our torsion range, where the load is body weight rather than a latch force.
Chair mechanisms are seen from below and are touched during adjustment, which is where a bright hard finish earns its cost.
At 5 mm wire a sharp leg transition is a fatigue crack waiting to happen. The transition radius is formed on the machine.
Confirm the spring is loaded in the winding direction through the full tilt range. Inspect the leg roots during scheduled maintenance, since this is where a seating spring shows fatigue first.
Chair springs that crack at the leg after months of daily tilting
Recliner mechanisms that lose their return force and leave the seat sagging
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.
A 5 mm torsion spring replaces the pair of 3 mm springs some chair designs use, reducing part count and assembly time, though it requires the mechanism to have room for a single larger body.
It depends on body diameter and coil count as well as wire size. Tell us the weight the mechanism carries and the angle of travel and we will design to it.
Shot peening is available and is worth specifying on heavily cycled seating springs, because it works directly against surface fatigue.
Yes. Non-standard and OEM drawings are the normal basis for production here.
Send your drawing, dimensions or a sample. We will confirm the specification and come back with a price and a lead time.
