Hydraulic seals

A hydraulic seal keeps pressurized fluid inside a cylinder or circuit and keeps dust, water and particles out. Diameter by itself does not define it. You also need to know whether it seals a rod or a piston, the system pressure and temperature, the sliding speed and the fluid in service. Those conditions determine the lip profile, the material and whether you need backup rings or guide rings.

The SKF seals in this line carry a type code followed by dimensions in millimeters, as in ZW 25X32, ZW 30X37 or ZW 42X52. The numbers on either side of the X are the nominal seal dimensions, and the full part number, letters included, defines the part. So when you order a replacement, the exact designation tells us far more than an approximate diameter.

Common applications include hydraulic cylinders on mobile equipment, presses, construction machinery, lifting systems and industrial automation. When a cylinder is rebuilt, replace the whole seal set: the main seal, backup and wiper work as a team and wear out together.

We carry SKF in this line. For a quote, send via WhatsApp the part number from the nameplate or drawing. Without it, give us the rod or piston diameter, the housing diameter, the height, the fluid and the working pressure; a photo of the old seal beside a caliper also helps. We will reply promptly.