A large diameter coil extension spring, nickel plated, for gym machines where the spring is visible to the user. The big coil gives a long usable stroke, and the nickel finish stands up to gym humidity and to being handled by people every day.
A big body diameter allows substantial extension without pushing individual coils to their stress limit.
Gym equipment springs are seen and touched constantly. Nickel keeps its appearance where zinc would dull in humid air.
Commercial gym equipment cycles continuously, so the design is driven by cycle life rather than by peak load alone.
Check the spring's fixing points during routine equipment servicing. On gym machines the anchor bracket usually wears before the spring does.
Springs dulling and spotting in humid gym air where users can see them
Resistance dropping over months of commercial use as springs take a 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 small diameter spring of the same force, the large coil version extends much further before reaching its limit, which is what a gym machine's stroke requires.
Tell us the daily cycle count you expect and we will design for it. Commercial and domestic duty are very different requirements.
Yes. It is harder than zinc and is the usual choice for parts that are touched regularly.
Send a sample of the original and we will match it, including the finish.
Send your drawing, dimensions or a sample. We will confirm the specification and come back with a price and a lead time.
