A tension spring finished in bright nickel, designed to hold a steady pull across its working range rather than to rise sharply with extension. It is used where a mechanism has to be kept under even tension through its travel, and where the spring is visible in the assembly.
The spring is designed so that the force variation across the working stroke stays small, rather than climbing steeply.
A hard, bright finish that holds up to handling and stays clean looking in display and instrument positions.
Because the requirement is force consistency across travel, the design starts from the stroke rather than from a free length.
Install at the preload agreed at design. The even-force behaviour depends on working within the intended part of the extension range, not from the free length.
Mechanisms that feel light at the start of travel and heavy at the end
Visible tension springs that tarnish and let down an otherwise finished product
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 | Tension 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.
Against a coiled constant force strip spring, a constant tension helical spring is easier to mount and cheaper, but its force varies more across a long stroke. For strokes measured in hundreds of millimetres, the strip design wins.
Within limits set by geometry. Where genuinely constant force across a long stroke is required, a coiled constant force strip spring is the correct part and we make those too.
Bright nickel gives a more reflective surface with comparable hardness. It is chosen where the part is seen.
Tell us the stroke and force band and we will confirm what is achievable in a helical design before quoting.
Send your drawing, dimensions or a sample. We will confirm the specification and come back with a price and a lead time.
