Hydraulic and pneumatic seals
We are one of the longest-standing Kastaş dealers. U-cups, rod and piston seals, wiper seals, guide rings, O-rings and seal kits for hydraulic and pneumatic cylinders: a wide range of sizes in stock, shipped across Türkiye and abroad.
Sealing is a system
In a hydraulic cylinder, what keeps the oil in and the dirt out is not a single seal but a system of elements working together: a buffer seal, a primary seal and a wiper on the rod side; a piston seal on the piston side; guide rings carrying the load on both; and O-rings at the end caps and ports. When one of them is missing or wrongly selected, even the best seal starts leaking in a short time.
We build this system in our own cylinder manufacturing and treat it as a whole in repair work: before replacing the seal we measure the rod and the tube and find the real cause of the leak. As a Kastaş authorized dealer and one of the longest-standing Kastaş dealers, we supply all profiles. Sending us the old seal or the groove dimensions is enough for us to find the right profile.
The types, selection logic and frequently asked questions of each group are on its own page:
Product images: Kastaş.
Product groups
Each group has its own page with types and a selection guide; current size lists and part numbers of the Kastaş profiles are in our catalog.
- Rod seals →U-cups, compact rod seals, buffer seals and packings: the elements that seal the rod side of hydraulic and pneumatic cylinders.
- Piston seals →Single- and double-acting piston seals, compact piston seal sets and low-friction PTFE seals: the elements that separate the two chambers of the cylinder.
- 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.
- Guide rings and guide strips →Phenolic resin, PTFE and POM guide rings (wear rings) and guide strip cut by the meter: the elements that center the rod and piston and carry side load.
- O-rings and static seals →O-rings in metric and inch sizes, back-up rings and bonded seals: static sealing for covers, flanges, fittings and valve blocks.
- Rotary shaft seals and V-rings →Radial shaft seals (oil seals) and V-rings: sealing of the rotating shaft in pumps, gearboxes and motors.
- Pneumatic seals →Piston seals, rod seals and wipers for pneumatic cylinders and valves: profiles designed for low pressure, high speed and low friction.
- Seal kits and repair kits →Complete seal kits for hydraulic cylinders, pumps and hydraulic motors: all the elements that need replacing in an overhaul, in a single package.
In cylinder repair and manufacturing
We use Kastaş seals in the hydraulic cylinders we manufacture and repair. Seal replacement is carried out in our workshop together with rod and tube inspection and a pressure test.