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dust cover fitted with one or both sides of the bearing
Typically suffix Z or 2Z iron bearing seal closures, suffix 2RS, DDU, LLU, 2RZ rubber sealed bearings,
depending on the bearing series and size, there are two different structural design, dust cover is stamped steel Analysis is made,
usually with an inner diameter of the cylindrical extension of the dust cover to form a long sealing gap with the inner ring shoulder.
Some dust cover without extension. Single row deep groove ball bearings with dust cover
Single row deep groove ball bearings with dust cover
Bearings with low friction seals: suffix RSL, 2RSL or RZ, 2RZ, depending on the bearing series and size,
there are three different structural design. Example: 60, 62 and 63 series bearings,
bearing outer diameter less than or equal to 25mm, with RSL seals
  60, 62 and 63 lines of bearing, outside diameter greater than 25mm,
less than or equal to 52mm bearings with RSL seals, other bearings with RZ seal.
  Between the inner ring and the shoulder of the inner cylindrical surface or concave contour forming a very narrow gap is not actually in contact,
therefore, provided with low friction bearing seals can be shuttered with Z bearings running at the same speed, but better sealing performance.
  Bearings, with contact seals suffix for RSH, 2RSH or RS1,2RS1. These are the mark of SKF bearings.
BEST Bearing Group is a authorized distributor of SKF Bearing company. They have cooperate with each for nearly four years. Also,
BEST have good business relationship with NSK Bearing company, FAG bearing company.