Wiper seals (dust seals)
Single-lip, double-lip and metal-cased wipers: the elements that stop dust, mud and moisture from entering the cylinder as the rod retracts.
In a cylinder working in a dirty environment, seal life is most often determined by the wiper. For construction machinery, agricultural, municipal vehicle and mining equipment cylinders we select the wiper to suit the environment and supply Kastaş wipers from stock.
Types
Single-lip wipers
General purpose; seated in a groove machined in the cylinder head.
Double-lip wipers
The outer lip wipes off dirt, the inner lip keeps the oil film on the rod inside.
Metal-cased wipers
Press-fitted into the housing; they stay in place under mud, ice and heavy dirt.
Pneumatic wipers
Profiles that combine sealing and wiping in a single element for pneumatic cylinders.
Product images: Kastaş.
How to select
As the rod extends and retracts, the wiper keeps out the dust, mud and moisture that stick to it. A single grain of sand that gets inside starts to score the rod surface and the seal; that is why the wiper is the cheapest but most critical part of the sealing system.
Selection depends on the environment. In a clean industrial environment a single-lip wiper is sufficient. For construction machinery working in mud and outdoors, a metal-cased or double-lip wiper is preferred; the double-lip type also keeps inside the thin oil film that passes the seal.
On cylinders that come in for repair we replace the wiper together with the seal: a new seal fitted with a worn wiper ends up in the same condition in a short time as dirt gets in.
Kastaş profiles for each type
| Type | Kastaş profile | Where it is fitted |
|---|---|---|
| Single-lip wiper | K06 | Rod, outer side of the cylinder head |
| Double-lip wiper | K05 | Rod, outer side of the cylinder head |
| Metal-cased wiper | K92 | Rod, in harsh environments (mud, ice) |
| Pneumatic wiper | K106 | Pneumatic cylinder rod |
The profile-to-type matching is taken from Kastaş's own product pages. The size list of each profile is in our catalog.
Frequently asked questions
Why is a wiper seal important?
Dirt carried in on the rod scores the seal and the rod and starts the leak. In a dirty environment, seal life is largely determined by the wiper.
Single-lip or double-lip wiper?
A single-lip wiper is sufficient in a clean environment. A double-lip wiper is preferred in dirty environments and where the oil film must not be carried outside.
When is a metal-cased wiper needed?
In construction machinery and municipal vehicle cylinders working under mud, ice or heavy dirt; because it is press-fitted into the housing, it does not come out of place.
Should the wiper be replaced when the seals are replaced?
Yes. A new seal fitted with a worn wiper is contaminated in a short time; during repair we replace the two together.
Why is oil leaking past the wiper?
The wiper is there to keep dirt out, not to hold oil in. If oil is coming from under the wiper, the real problem is the rod seal behind it.
When should a wiper be replaced?
When its lip is torn or hardened, or when score marks have appeared on the rod. The wiper costs less than the rod seal but protects it; we recommend replacing it together with the rod seal during repair.
Stock, sizes and part numbers
Sizes in stock, manufacturer part numbers and brands are kept up to date in our catalog. Send us your requirement on WhatsApp or by e-mail and we will quote and ship worldwide.
Wiper seals (dust seals) in the catalog Online store (Turkish) →