Radial shaft seals

A radial shaft seal, or oil seal, rides on a rotating shaft with a flexible lip that holds lubricant inside and keeps dust, water and particles out. You find it on gearboxes, speed reducers, pumps, electric motors, drive shafts and process equipment. Seal and bearing depend on each other: once the lip stops touching the shaft or the elastomer goes hard, oil leaks out, dirt gets in and the bearing fails early.

Size is given by three dimensions, always in this order: shaft diameter (d), bore diameter (D) and width (h). SKF also uses its own numeric part numbers, for example 28758, 32470 and 1033228/E. Those numbers do not spell out the size; they are looked up in the brand's table, so send the full part number with any slash or trailing letter.

Dimensions alone do not pick the seal. Lubricant type, shaft surface speed, temperature and pressure set the lip material (NBR or FKM, for example) and the design: single lip, an added dust lip, or a metal case. Check the shaft too. A worn groove where the lip runs calls for a wear sleeve, or for a seal of a different width so the lip lands on fresh surface.

We supply SKF radial shaft seals. For a quote, send the part number or the three dimensions (shaft, bore and width) and the material, plus a photo of the old seal if you can. A cross-reference from another brand helps us match it. When the seal goes into an assembly with bearings, housings or drive parts, we quote everything together. Reach us on WhatsApp or by email and we'll answer promptly.