Hydraulic seals

A hydraulic seal contains pressurized fluid within a cylinder or circuit and, at the same time, prevents the ingress of dust, water and particles. To select it, the diameter alone is not enough: you need to define whether it seals a rod or a piston, the system pressure and temperature, the sliding speed and the fluid it works with. From these come the lip geometry, the material and the need for backup or guide rings.

The SKF seals in this subcategory are identified by a type code followed by dimensions in millimeters, as in ZW 25X32, ZW 30X37 or ZW 42X52. The figures separated by X are the nominal seal dimensions, and the complete code, with its letters, defines the part. Therefore, the most useful information when ordering a replacement is the exact designation, rather than an approximate diameter.

Typical applications are hydraulic cylinders in mobile equipment, presses, construction machinery, lifting systems and industrial automation. When servicing a cylinder, it is advisable to renew the complete sealing assembly, because the main seal, backup and wiper work together and wear together.

In this subcategory we work with SKF. To request a quote, send us the code from the nameplate or drawing via WhatsApp. If you don't have it, provide the rod or piston diameter, housing diameter, height, fluid and working pressure; a photo of the old seal next to a caliper also helps. We will quote promptly.