A small black coated extension spring for adjustment mechanisms in industrial equipment, where a fitter sets a position and the spring holds it. Its job is to take up slack and maintain contact rather than to carry a working load.
Sized to maintain contact and take up slack, which needs far less force than a load carrying spring and keeps the mechanism easy to adjust.
A small body fits adjustment mechanisms that have no room left once the working components are in.
Keeps the spring unobtrusive in equipment where a bright part would catch the eye during inspection.
Set the mechanism to its mid position and check the spring still has extension available at both ends of travel. A light spring that goes slack loses contact entirely.
Adjustment mechanisms that drift out of setting because nothing holds them
Springs too strong for an adjustment duty, making the mechanism stiff to set
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 heavier general purpose extension spring, this part is deliberately soft so that the mechanism stays adjustable by hand. Using a stronger spring to be safe makes the adjustment worse, not better.
Fine wire and a high coil count give very light forces. Tell us the force you want and we will design to it.
Yes. Set removal matters as much on a light spring as on a heavy one, because a light spring that relaxes stops doing its job entirely.
Yes. Mixed ends are routine.
Send your drawing, dimensions or a sample. We will confirm the specification and come back with a price and a lead time.
