QJ2 series four point contact bearings are single row, non-self-retaining radial ball bearings. They are similar in their structure to single row angular contact ball bearings 7000, 7200, 7300 series ; the raceways on the inner rings are, however, designed such that they can support axial loads in both directions. For a given axial load, a limited radial load can be supported. These bearings take up considerably less axial space than double row bearings. The inner ring is split. It enables a large number of balls to be incorporated in the bearing, giving the bearing its high load carrying capacity. QJ2 type bearings are separable, i.e. the outer ring with ball and cage assembly can be mounted separately from the two inner ring halves. The bearings are available in a standard design and with two locating slots in the outer ring. The centre points of curvature of the arc-shaped raceways on the inner and outer ring are offset relative to each other in such a way that the balls are in contact with the bearing rings at four points under radial load.

These bearings have solid outer rings, split inner rings and ball and cage assemblies with brass or polyamide cages. The two-piece inner ring allows a large complement of balls to be accommodated in the bearing. The inner ring halves are matched to the particular bearing and must not be interchanged with those of other bearings of the same size. In an axial direction, four point contact bearings are considerably narrower than double row angular contact ball bearings. 

Four point contact bearings are often combined with a radial bearing and used as an axial bearing with radial clearance in a housing. For quick and secure location of the bearings in the housing, larger bearings therefore have two retaining slots in one end face of the outer ring offset by 180°. Locking pins engage in these retaining slots and locate the outer ring in the housing.

Application

Compressors, fluid and hydraulic pumps, automotive chassis and gearboxes, rail and wind turbine applications,agricultural vehicles equipment etc.

Bearing Model	Dimensions(mm)			Basic Load Rating(N)		Speed ratings(r/min)		Weight(kg)
	d	D	B	Dyn.C	Stat.Co	Grease	Oil
QJ203	17	40	12	15900	10600	14000	19000	0.082
QJ205	25	52	15	25100	20000	9500	14000	0.160
QJ206	30	62	16	35100	28500	8500	12000	0.240
QJ207	35	72	17	46200	39000	7500	10000	0.350
QJ208	40	80	18	52700	45000	6700	9000	0.450
QJ209	45	85	19	58500	51000	6300	8500	0.520
QJ210	50	90	20	61800	56000	5600	7500	0.590
QJ211	55	100	21	79300	76500	5300	7000	0.770
QJ212	60	110	22	92300	86500	4800	6300	0.980
QJ213	65	120	23	104000	104000	4300	5600	1.200
QJ214	70	125	24	114000	114000	4300	5600	1.300
QJ215	75	130	25	117000	122000	4000	5300	1.450
QJ216	80	140	26	138000	146000	3600	4800	1.850
QJ217	85	150	28	148000	160000	3400	4500	2.250
QJ218	90	160	30	174000	186000	3200	4300	2.750
QJ219	95	170	32	199000	212000	3000	4000	3.350
QJ220	100	180	34	225000	240000	2800	3800	3.850
QJ222	110	200	38	265000	305000	2400	3400	5.500
QJ224	120	215	40	286000	340000	2200	3200	6.750
QJ226	130	230	40	296000	365000	1900	2800	7.750
QJ228	140	250	42	325000	440000	1800	2600	9.660
QJ230	150	270	45	338000	465000	1700	2400	12.400
QJ232	160	290	48	390000	570000	1600	2200	14.500
QJ234	170	310	52	397000	600000	1600	2200	18.900
QJ236	180	320	52	436000	680000	1500	2000	19.000
QJ248	240	440	72	650000	1200000	1000	1500	54.000