Searches for stainless steel and galvanised wire rope have grown fast this year, mostly from people who want rope that will not rust. All three options below resist corrosion, but in different ways and at different costs.
Galvanised wire rope
Galvanised rope is made from carbon steel wires coated with zinc. The zinc corrodes first and protects the steel underneath. It has the same construction choices as bright rope (6x19, 6x36 and so on) and similar strength, at a moderate extra cost.
- Good for: outdoor cranes and winches, guy wires, fencing, construction sites, monsoon exposure.
- Limits: once the zinc is used up, the rope rusts like bright rope. In salt spray this happens much faster.
Stainless steel (SS) wire rope
Stainless rope is made from stainless steel wire, so the whole wire resists corrosion rather than just a coating. Two grades are common:
- SS 304: good general corrosion resistance. Used for architectural railings, food plants, indoor and covered outdoor work.
- SS 316: contains molybdenum for better resistance to chlorides. The right choice for marine, coastal, swimming pool and chemical environments.
Stainless rope usually has a lower breaking load than a carbon steel rope of the same size and construction, and costs considerably more. Always check its own load table rather than using a carbon steel table.
PVC-coated wire rope
PVC-coated rope is usually a galvanised rope with a plastic jacket. The jacket seals out moisture, protects hands and surfaces, and can be coloured. It is sized two ways, for example "3/4 mm" means a 3 mm rope with a 4 mm outside diameter.
- Good for: gym and fitness cables, safety barriers, railings, clothesline wire, signage and light guy lines.
- Limits: the jacket hides broken wires and corrosion, so it is not suited to critical lifting where the rope must be inspected.
Side-by-side comparison
| Galvanised | SS 304 | SS 316 | PVC-coated | |
|---|---|---|---|---|
| Corrosion resistance | Good | Very good | Best (marine) | Good while jacket is intact |
| Strength vs carbon steel | Similar | Lower | Lower | Depends on core rope |
| Relative cost | Low | High | Highest | Low to medium |
| Easy to inspect | Yes | Yes | Yes | No |
| Typical use | Outdoor lifting and guying | Railings, food, indoor | Marine, coastal, chemical | Gyms, barriers, clotheslines |
Which should you choose?
- Crane, hoist or winch working outdoors: galvanised (or follow the equipment maker)
- Near the sea, docks or chemical plants: SS 316
- Visible architectural or food-grade use: SS 304 or 316
- Gym equipment, barriers, clotheslines: PVC-coated
We supply galvanised, stainless steel and PVC-coated wire ropes. Send us the diameter, length and application for a quotation.
Frequently asked questions
Is stainless steel wire rope stronger than galvanised?
Usually not. Stainless rope generally has a lower breaking load than a carbon steel rope of the same size and construction. Its advantage is corrosion resistance.
What is the difference between SS 304 and SS 316 wire rope?
SS 316 contains molybdenum, which makes it more resistant to salt and chlorides. Use 316 for marine and coastal work; 304 is fine for most indoor and general use.
Can PVC-coated wire rope be used for lifting?
It is not recommended for critical lifting because the coating hides broken wires and corrosion during inspection. It is ideal for gyms, barriers and similar uses.