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The Four-point Contact Ball Bearing is the separable bearing, typically available in two structures: QJ 0000 (with two half inner rings and a complete outer ring); QJF 0000 (with two half outer rings a complete inner ring).
For this type of bearings, the contact angle is usually 35°. When carrying pure radial loads, each ball contacts with rings at four-point, and they are two-point contact under purely axial loads. The bearings can carry axial loads in two directions and specific moment loads. This type of bearings typically works at high speed when two-point contact is formed.
Brass or aluminum solid cages are precisely suitable for four-point contact ball bearings.
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