Four point contact ball bearing is a kind of separate type bearing, which can also be said to be a set of angular contact ball bearing which can bear bidirectional axial load.

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Four point contact ball bearing is a kind of separate type bearing, which can also be said to be a set of angular contact ball bearing which can bear bidirectional axial load. When the inner ring and the outer ring are in contact with each other in radial direction, or when the outer ring is in contact with the inner ring, the outer ring is in radial contact

Characteristic of four-point contact ball bearing

Designation	Dimensions(mm)				Basic Load Ratings(KN)		Limiting Speed(RPM)	Mass (kg)	Abutment and Fillet Dimensions(mm)
Designation	Bore d	Outer Diameter D	Width B	Minimum Chamfer r smin	Cr	Cor	Open	Approx.	damin	Da max	ra max
205	25	52	15	1.0	27.1	21.2	22000	0.16	30.6	46.4	1.0
305	25	62	17	1.1	42.5	30.1	20000	0.29	32.0	55.0	1.0
206	30	62	16	1.0	37.5	30.5	19000	0.24	36.0	56.0	1.0
207	35	72	17	1.1	41.0	61.5	16000	0.35	42.0	65.0	1.0
208	40	80	18	1.1	56.0	49.0	15000	0.45	47.0	73.0	1.0
209	45	85	19	1.1	63.0	56.0	14000	0.52	52.0	78.0	1.0
309	45	100	25	1.5	100.0	83.0	12000	1.05	50.8	91.0	1.5

Custom size requirement are also available

Features

● High accuracy

● Large load capacity

● High efficiency

● Smooth transmission

● Low noise

When only the pure axial load acts, the ball and the ferrule become two-point contact, which can bear two-way axial load. The four point contact ball bearing can also bear the moment load and has the functions of single row angular contact ball bearing and double row angular contact ball bearing. The four point contact ball bearing can work normally only when two-point contact is formed. Therefore, it is generally applicable to those cases with pure axial load or large axial load with two-point contact. The limit speed of four point contact ball bearing is high, and it is also suitable for those high-speed operation occasions.

Applications

The four-point contact ball bearing is a separable bearing, in other words, a set of angular contact ball bearings capable of bearing bidirectional axial loads. The cross sections of the inner and outer raceway are peach shaped. When there is no load or pure radial load, the ball and ring have four points of contact.

High-precision matched angular contact ball bearings are commonly used on machine tool spindles and have a preload.they are widely used in spindle, turbine, motor, gear shaft and etc.

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