A small round wire torsion spring for the flip cap and dispensing mechanism of polyethylene squeeze bottles. The spring returns the cap or the valve after each press, which means it cycles every single time the product is used and must not fail inside a consumer package.
Fine wire and a small body fit the moulded pocket of a cap without forcing the plastic apart.
A dispensing cap that returns weakly feels faulty to the end user. Programmed coiling keeps the free angle identical across the run.
Packaging hardware runs in very high quantities, which is exactly what automatic coilers in fine wire are built for.
Check that the moulded pockets fully capture both legs. A leg that can walk out of its pocket during transport is the usual cause of caps arriving loose at the filling line.
Caps that stop snapping shut after a few weeks of daily use
Springs that vary enough in free angle to jam automatic cap assembly
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 moulded plastic living hinge is cheaper than a metal spring but fatigues and cracks. A steel torsion spring costs more per cap and keeps working for the life of the package.
It depends on the product. Tell us what the bottle contains and we will specify stainless or an appropriate plating rather than guessing.
Yes. Packing is agreed to suit your feeder, since bowl feeding small springs depends on how they are packed and whether they tangle.
Production starts at 0.1 mm wire, which is well below the size normally needed for closures.
Send your drawing, dimensions or a sample. We will confirm the specification and come back with a price and a lead time.