Deep groove ball bearings are simple versions of roller bearings and, given their many different uses, among the most widely distributed roller bearings. They are self-retaining bearings consisting of solid outer and inner rings and a ball and cage assembly. Their design with relatively deep raceways allows them to absorb radial and axial loads in both directions, making them extremely suitable for high rotational speeds.
Deep groove ball bearings are available in a large number of versions as single or double-row bearings. They can be open, closed on one side or closed on both sides.
Deep groove ball bearings up to Ø 1700 mm
Versions preferably with sheet steel cage or brass cage.
In the closed versions there are two types of sealing as standard:
- Deep groove ball bearings with contact sealing washers (RS) offer the best protection against contamination from the outside, and bearings sealed on both sides are lubricated for life. However, the frictional resistance of the contact seals limits the maximum speed and the limit of application of the standard seals is + 110 °C.
- Deep groove ball bearings with non-contact cover discs (Z) offer relatively good protection against coarse contamination from the outside. Bearings with cover discs on both sides are pregreased and the lower frictional resistance due to the lack of contact with the inner ring allows higher speeds compared to bearings with sealing washers. The limit of application of the standard lithium soap grease is + 110 °C.
Deep groove ball bearings with low-friction seals, special seals (material: FPM, FKM) and special lubricants or particular current insulation can also be manufactured on request.
There is very little scope for adjusting the angle of deep groove ball bearings, so misalignments or shaft deflections can only be compensated to a very small extent. Misalignments shorten the service life of deep groove ball bearings and lead to greater running noise.
Deep groove ball bearings in the standard version are manufactured with a normal bearing clearance (C0 or CN – no suffix added to the bearing designation). Bearings with a reduced or increased bearing clearance can also be manufactured on request.
- C2 Radial internal clearance < CN *
- C3 Radial internal clearance > CN *
- C4 Radial internal clearance > C3 *
- C5 Radial internal clearance > C4 *
* These bearing clearance designations are added as suffixes to the bearing designation.
Deep groove ball bearings are manufactured with the normal tolerances (P0) of the radial bearings. P0 is not indicatedm in the bearing designation.
Bearings can also be manufactured with a greater precision to meet particular requirements.
- P6 Restricted tolerance *
- P5 Restricted tolerance *
* These tolerance classes are added as suffixes to the bearing designation.
In the standard version (S0) deep groove ball bearings are heat treated so that they are generally dimensionally stable up to max + 150 °C (in the case of sealed bearings the max. permitted temperature depends on the chosen grease and the material quality of the seals used). Special heat treatments are required for higher operating temperature requirements.
- S1 Operating temperature max. + 200 °C *
- S2 Operating temperature max. + 250 °C *
- S3 Operating temperature max. + 300 °C *
- S4 Operating temperature max. + 350 °C *
* These temperature classes are added as suffixes to the bearing designation.
Rustproof steel deep groove ball bearings of the S60, S62, S63, S68 and S69 series are available for use in corrosive environments.
M Solid brass cage, ball element riding
MA Solid brass cage, outer ring riding
RS Sealing washer on one side
2RS Sealing washers on both sides
Z Cover disc on one side
ZZ Cover discs on both sides
N Locking groove
NR Locking groove with locking ring
K Conical α = 1/12