SKF sealed self-aligning ball bearings

SKF self-aligning ball bearings have two rows of balls, a common sphered raceway in the outer ring and two deep uninterrupted raceway grooves in the inner ring. Sealed bearings equipped with contact seals on both sides are available:

• in the 22 and 23 series 
• with bore diameter from 10 to 70 mm 
• with seals made of sheet steel reinforced NBR (oil and wear-resistant, designation suffix 2RS1) 

Permissible angular misalignment of sealed bearings is slightly reduced compared to open design bearings. 

Greases for capped bearings

SKF sealed self-aligning ball bearings on both sides are lubricated for the life of the bearing and are virtually maintenance-free. They are filled with one of the following standard greases, which have good corrosion inhibiting properties:

• D ≤ 62 → MT47 grease
• D > 62 → MT33 grease

Grease life for SKF sealed self-aligning ball bearings

• is presented as L10, i.e. the time period at the end of which 90% of the bearings are still reliably lubricated
• depends on the operating temperature and the speed factor.

The grease life is valid for the following combination of operating conditions:

• horizontal shaft
• inner ring rotation
• light load (P ≤ 0,05 C)
• operating temperature within the green temperature zone of the grease
• stationary machine
• low vibration levels 

Where the operating conditions differ, the grease life obtained from the diagram should be adjusted:

• vertical shafts → 50% of the obtained value
• heavier loads (P > 0,05 C) →  apply reduction factor