DBH 9478Pol radial shaft seal — 21.9 x 40 x 7/8

DBH 9478Pol is a reference of radial shaft seal, within Seals. Request a quote for 9478Pol via WhatsApp or email with the quantity you need; we respond promptly with the quote and equivalents.

The DBH 9478Pol radial shaft seal is a lip seal that closes the passage of oil or grease between a rotating shaft and its housing. With a 21.90 mm shaft diameter, 40.00 mm housing and a height of 7.00/8.00 mm, it is press-fitted into the housing and runs on the shaft with the lip in contact. Its Lx-R-H design combines a sealing lip, metal reinforcement and spring, a common configuration in small and medium-sized gearboxes, pumps and electric motors.

This DBH 9478Pol seal has a shaft diameter of 21.90 mm, a housing diameter of 40.00 mm and a height of 7.00/8.00 mm. The Lx-R-H design indicates a sealing lip, reinforced body and retaining spring, the most widespread variant for rotating shafts with permanent lubrication. DBH is a brand that MR carries, so the part number is identified exactly as shown and is checked against the manufacturer's product page before quoting.

Typical applications for a seal of this size appear in gearboxes, centrifugal pumps, electric motors, compressors and power transmission equipment. In all cases it performs the same function: retaining lubricant inside the assembly and preventing the entry of dust, water or particles. It is also used as a secondary closure in bearings and bushings where axial space is limited.

To select the seal correctly, check that the shaft and housing diameters match the values on the product page, that the available height accommodates the 7.00/8.00 mm and that the shaft surface is sound, without burrs or deep marks. The lip must be lubricated during assembly and the seal is inserted perpendicular, with a press or support tube, never by striking the lip. If the shaft shows wear, it is advisable to evaluate a repair sleeve.

If you need a different size, we can look for an equivalent from another brand or a variant in the same category. For that, send us the part number, the shaft, housing and height dimensions, and a photo of the old seal if you have one. With that data we review sealing alternatives and confirm which option fits without modifying the housing.

If you want a quote for the DBH 9478Pol or to ask about an equivalent, write to us on WhatsApp with the part number and dimensions. We will reply with the alternative that best suits your equipment.