Four Point Contact Ball Bearings

QJ
QJ...N2

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Design Variants

Misalignment

Cage

Tolerance

Internal clearance

To allow the bearings to accept the maximum number of balls, four point contact ball bearings are designed with split inner ring or with split outer ring so these bearings have two basic types, one is featured two half inner ring (QJ series), an other is featured two half outer ring (Q series).

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DHK four point contact ball bearings have the contact angle of 35 .

DHK four point contact ball bearings mainly produce QJ series. DHK can provide Q series bearings on request.

DHK four point contact ball bearings with outer ring diameters of more than 160mm are produced with two locating slots in their outer ring (suffix N2), DHK can also provide small size of outer diameter within 160mm with locating slots.

To allow the bearings to accept the maximum number of balls, four point contact ball bearings are designed with split inner ring or with split outer ring so these bearings have two basic types, one is featured two half inner ring (QJ series), an other is featured two half outer ring (Q series).

DHK four point contact ball bearings have the contact angle of 35 .
DHK four point contact ball bearings mainly produce QJ series. DHK can provide Q series bearings on request.
DHK four point contact ball bearings with outer ring diameters of more than 160mm are produced with two locating slots in their outer ring (suffix N2), DHK can also provide small size of outer diameter within 160mm with locating slots.
DHK four point contact ball bearings are fitted with outer ring centred solid brass cage (suffix MPA) as standard.

DHK four point contact ball bearings are produced to the normal tolerance class (PN) as standard.

Other tolerance classes such as P6 or P5 are available on request.

Detailed values are listed in chapter of tolerance of radial bearings, page 8 .

Tolerances for DHK four point contact ball bearings (excluding tapered roller bearings)

All dimensions shown in (mm):

Tolerances in (um):

Inner Ring

PN/(Normal)

Nominal Bore diameter		Deviation dmp	Variation Vdp Series			Variation Vdmp	Taper bore 1:12 Deviation/ Variation
>	<=	△dmp	7．8．9	0．1	2．3．4	Vdmp	△dmp	△d1mp-dmp	Vdp
2.5 10		0 -8	10	8	6	6	+15 0	+15 0	10
10 18		0 -8	10	8	6	6	+18 0	+18 0	10
18 30		0 -10	13	10	8	8	+21 0	+21 0	13
30 50		0 -12	15	12	9	9	+25 0	+25 0	15
50 80		0 -15	19	19	11	11	+30 0	+30 0	19
80 120		0 -20	25	25	15	15	+35 0	+35 0	25
120 180		0 -25	31	31	19	19	+40 0	+40 0	31
180 250		0 -30	38	38	23	23	+46 0	+46 0	38
250 315		0 -35	44	44	26	26	+52 0	+52 0	44
315 400		0 -40	50	50	30	30	+57 0	+57 0	50
400 500		0 -45	56	56	34	34	+63 0	+63 0	56
500 630		0 -50	63	63	38	38	+70 0	+70 0
630 800		0 -75					+80 0	+80 0
800 1000		0 -100					+90 0	+90 0
1000 1250		0 -125					+105 0	+105 0
1250 1600		0 -160
1600 2000		0 -200

Outer ring

PN/(Normal)

Nominal Outer diameter		Deviation	Variation Vdp Series			Sealed bearing	Variation	Radial runout
>	<=	△Dmp	7．8．9	0．1	2．3．4	2 3 4	VDmp	Kea
6 18		0 -8	10	8	6	10	6	15
18 30		0 -9	12	9	7	12	7	15
30 50		0 -11	14	11	8	16	8	20
50 80		0 -13	16	13	10	20	10	25
80 120		0 -15	19	19	11	26	11	35
120 150		0 -18	23	23	14	30	14	40
150 180		0 -25	31	31	19	38	19	45
180 250		0 -30	38	38	23		23	50
250 315		0 -35	44	44	26		26	60
315 400		0 -40	50	50	30		30	70
400 500		0 -45	56	56	34		34	80
500 630		0 -50	63	63	38		38	100
630 800		0 -75	94	94	55		55	120
800 1000		0 -100	125	125	75		75	140
1000 1250		0 -125						160
1250 1600		0 -160						190
1600 2000		0 -200						220
2000 2500		0 -250						250

DHK four point contact ball bearings are produced to normal axial clearance group (CN) as standard. DHK can provide four point contact ball bearings with other group clearance on request.

Detailed values for axial clearance groups are listed in the table below.

Internal axial clearance groups of DHK four point contact ball bearings

(Clearances are in [um])

Bore Dia.(mm)		C2		CN		C3			C4
>	<=	Min	max	Min	max	Min	max		Min	max
10	17	15	55	45	85	75	125		115	165
17	40	26	66	56	106	96	146		136	186
40	60	36	86	76	126	116	166		156	206
60	80	46	96	86	136	126	176		166	226
80	100	56	106	96	156	136	196		186	246
100	140	66	126	116	176	156	216		206	266
140	180	76	156	136	196	176	246		226	296
180	220	96	176	156	226	206	276		256	326
220	260	115	195	175	245	225	305		285	365
260	300	135	215	195	275	255	335		315	395
300	350	155	235	215	305	275	365		345	425
350	400	175	265	245	335	315	405		385	475
400	500	205	305	285	385	355	455	435			525

Dimensions and Parameters

Inquiry	Designation	Boundary dimensions（mm）								Load ratings(kN)		Speed ratings(rpm )		Mass
Inquiry	Designation	d	D	B	r1,r2 Min	a	an	bn	rn	dyn Cr	stat Cor	grease	oil	Kg
	QJ204.MPA	20	47	14	1	23	--	--	--	22.7	16	12000	17000	0.14
	QJ304.MPA	20	52	15	1.1	26	--	--	--	30	19.6	10000	15000	18
	QJ205.MPA	25	52	15	1	27	--	--	--	25.3	19.8	9500	14000	0.17
	QJ305.MPA	25	62	17	1	31	--	--	--	44	31.5	9500	13500	0.25
	QJ206.MPA	30	62	16	1	32	--	--	--	38.5	30	8500	12000	0.3
	QJ306.MPA	30	72	19	1.1	36	--	--	--	55	40.5	7500	10000	0.37
	QJ207.MPA	35	72	17	1.1	42	--	--	--	49.8	40	7500	10000	0.46
	QJ307.MPA	35	80	21	1.5	46	--	--	--	61	47	7000	9500	0.5
	QJ208.MPA	40	80	18	1.1	42	--	--	--	55.9	50.4	6700	9000	0.39
	QJ308.MPA	40	90	23	1.5	46	--	--	--	79	63.5	6300	8500	0.69
	QJ209.MPA	45	85	19	1.1	45	--	--	--	61.7	55.1	6300	8500	0.48
	QJ309.MPA	45	100	25	1.5	51	--	--	--	93.7	77.3	5600	7500	0.95
	QJ210.MPA	50	90	20	1.1	49	--	--	--	64.2	60.4	5600	7500	0.64
	QJ310.MPA	50	110	27	2	56	--	--	--	118	99	5000	6700	1.37
	QJ211.MPA	55	100	21	1.5	54	--	--	--	80	76	5300	7000	0.68
	QJ311.MPA	55	120	29	2	61	--	--	--	135	116	4500	6000	1.74
	QJ212.MPA	60	110	22	1.5	60	--	--	--	92	87	4800	6300	0.87
	QJ312.MPA	60	130	31	2.1	67	--	--	--	154	134	1300	5600	2.18
	QJ213.MPA	65	120	23	1.5	65	--	--	--	109	106	4300	5600	1.24
	QJ313.MPA	65	140	33	2.1	72	--	--	--	174	154	4000	5300	2.69
	QJ214.MPA	70	125	24	1.5	68	--	--	--	114	115	4300	5600	1.39
	QJ314.MPA	70	150	35	2.1	77	--	--	--	192	174	3600	4800	3.25
	QJ215.MPA	75	130	25	1.5	72	--	--	--	118	123	4000	5300	1.77
	QJ315 N2.MPA	75	160	37	2.1	82	10.1	8.5	2	212	204	3400	4500	3.93
	QJ216.MPA	80	140	26	2	77	--	--	--	138	146	3600	4800	1.8
	QJ316 N2.MPA	80	170	39	2.1	88	10.1	8.5	2	230	229	3200	4300	4.61
	QJ217.MPA	85	150	28	2	82	--	--	--	153	160	3400	4500	2.25
	QJ317 N2.MPA	85	180	41	3	93	11.7	10.5	2	248	255	3000	4000	5.49
	QJ218.MPA	90	160	30	2	88	8.1	6.5	1	175	186	3200	4300	2.89
	QJ318 N2.MPA	90	190	43	3	98	11.7	10.5	2	267	283	2800	3800	6.34
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