Overview Of Bearing And Seal Types

Types of sealed bearings

For any application that requires equipment with rotating or rolling parts, the selection of bearings and seals is critical.

Bearings are essential to allow rotational and linear movement in various mechanical and non-mechanical equipment while limiting friction and dispersing the stress of radial and axial loads. Otherwise, it will cause catastrophic failure.

The seal has a dual purpose: to retain the necessary lubricant inside the bearing while preventing any contamination or other harmful particles from entering the gap.

For users who need bearing and seal solutions but are unfamiliar with the technical names and descriptions of various types of bearings and seals on the market, the following content will serve as an introduction. The purpose of each type of bearing and seal will also be explained in detail.

Bearing 33 638
Types of sealed bearings -TFL

Anti-Friction Bearing Types

There are two major categories of anti-friction bearings: ball and roller.

Sealing Types

Seals are necessary to protect and enable the function of your chosen bearings. The choice of sealing configurations is vital and should be specific to the application.

Stainless steel miniature deep groove ball bearing ss 682 2rs 2x5x2 3 mm 2

Deep groove ball bearings without seal (open bearing)


  • no frictional resistance
  • easy relubrication


  • quick soiling

Miniature deep groove ball bearing inch r144 w2 38 open dry 3 175x6 35x2 38 mm 3

Deep groove ball bearings with steel seals on both sides (ZZ)


  • Comparable with FAG as well as SKF: 2Z
  • Material: sheet steel
  • Structure: gap seal made of a profiled sheet steel washer


  • Touchless
  • No additional friction and increase in temperature
  • Can be used up to limiting speed
  • Good sealing action against leakage of grease
  • Long maintenance-free period (lifetime lubrication)


  • Limited sealing action in case of soilingg

Cam rollers

Deep groove ball bearings with rubber seals on both sides (2RS)

2RS seal

  • Comparable with FAG: 2RSR SKF: 2RS1, 2RSH
  • Material: NBR, temperature resistance -20 °C to 100°C (up to 120° C for a short time)
  • Structure: contact lip seal on both sides


  • High sealing action against soiling and humidity
  • NBR is resistant to a multitude of aggressive materials
  • Long maintenance-free term (lifetime lubrication)


  • Increased frictional resistance


1/2 Sealing shield(s) Z / ZZ
our designation
Z / 2ZZ / 2ZZ / 2ZZ / ZZZ / ZZZ / ZZZ / ZZZ / ZZ
1/2 Sealing shield(s) RS / 2RS
our designation
RS1 / 2RS1
RS2 / 2RS2
DU /
LU /
RS /
E /
RS /

If desired, we can also offer roller bearings of the brand’s INA/FAG, NTN, SNR, NSK, SKF, TIMKEN, RBC, KOYO, and IKO. If required, please send us your inquiry via our contact form.