SKF Mudblock seal designs MUD5 and MUD7

SKF Mudblock cassette seal
SKF Mudblock seal designs MUD5 and MUD7 are a new generation of radial shaft sealing units, specifically developed for heavy-duty applications in harsh environments and tough operating conditions.
SKF Mudblock seals MUD5 (fig 1) are designed for oil lubricated applications and provide features including:
  • half metal / half rubber outside diameter for reliable seal retention in the bore as well as improved sealing performance
  • spring-loaded main lip with SKF WAVE lip design for bi-directional pumping action
  • axial and auxiliary radial lips for contaminant exclusion
  • integrated wear sleeve, curled for a reliable unitized solution to facilitate installation and prevent damage to the lips during transportation, handling and installation
  • centrifugal flap for exclusion of contaminants
  • bumper maintaining the relative position between the seal and the sleeve as well as acting as a barrier against contaminants
  • rubber covered inside diameter for high sealing ability and easy installation
SKF Mudblock seals MUD7 (fig 2) are designed for use in grease lubricated applications and provide features including:
  • half metal / half rubber outside diameter for reliable seal retention in the bore as well as improved sealing performance
  • rubber covered inside diameter for improved sealing performance and easy installation
  • integrated wear sleeve
  • SKF patented lip design for extended bearing service life
  • bumper maintaining the relative position between the seal and the sleeve as well as acting as a barrier against contaminants
  • auxiliary radial lips for contaminant exclusion
The SKF patented lip design has a special geometry combining both a spring-loaded radial lip and an axial lip. This design enables excess pressure inside the bearing chamber to pass the lip. Thus, the bearing can run cooler, resulting in extended service life.
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