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
	QJ219 N2.MPA	95	170	32	2.1	93	8.1	6.5	1	199	213	3000	4000	3.37
	QJ319 N2.MPA	95	200	45	3	103	11.7	10.5	2	258	313	3600	3600	7.4
	QJ1020.MPA	100	150	24	1.5	88	--	--	--	106	134	3200	4300	1.6
	QJ220N2.MPA	100	180	34	2.1	98	10.1	8.5	2	225	240	2800	3800	4.05
	QJ320N2.MPA	100	215	47	3	110	11.7	10.5	2	307	340	2400	3400	9.3
	QJ1020N2.MPA	105	160	26	2	93	6.5	6.5	1	124	156	3000	4000	2
	QJ221N2.MPA	105	190	36	2.1	103	10.1	8.5	2	242	270	2600	3600	4.8
	QJ321N2.MPA	105	225	49	3	116	11.7	10.5	2	344	406	2200	3200	10.5
	QJ1022N2.MPA	110	170	28	2	98	6.5	6.5	1	146	186	2800	3800	2.5
	QJ222N2.MPA	110	200	38	2.1	109	10.1	8.5	2	265	305	2400	3400	5.6
	QJ322N2.MPA	110	240	50	3	123	11.7	10.5	2	364	430	2000	3000	12
	QJ224N2.MPA	120	215	40	3	117	11.7	10.5	2	286	340	2200	3200	6.95
	QJ324N2.MPA	120	260	55	4	133	11.7	10.5	2	390	490	1900	2800	15.3
	QJ226N2.MPA	130	230	40	3	126	11.7	10.5	2	296	365	1900	2800	7.75
	QJ326N2.MPA	130	280	58	4	144	12.7	10.5	2	423	560	1800	2600	19.5
	QJ228N2.MPA	140	250	42	3	137	11.7	10.5	--	325	440	1800	2600	9.85
	QJ328N2.MPA	140	300	62	4	154	12.7	10.5	--	468	640	1700	2400	23
	QJ328.MPA	140	300	62	4	154	--	--	--	468	640	1700	2400	23.3
	QJ1030N2.MPA	150	225	35	2.1	131	8.1	6.5	1	216	305	1900	2800	5.25
	QJ1030.MPA	150	225	35	2.1	131	--	--	--	216	305	1900	2800	5.29
	QJ230N2.MPA	150	270	45	3	147	11.7	10.5	2	338	465	1700	2400	12.5
	QJ330N2.MPA	150	320	65	4	165	12.7	10.5	2	494	710	1600	2200	29
	QJ1030N2.MPA	160	240	38	2.1	140	10.1	8.5	1	247	355	1800	2600	6.45
	QJ232N2.MPA	160	290	48	3	158	12.7	10.5	2	390	570	1600	2200	15.2
	QJ1032N2.MPA	160	340	68	4	175	12.7	10.5	2	540	815	1500	2000	34.5
	QJ1034N2.MPA	170	260	42	2.1	151	--	--	1	292	410	1700	2400	8.23
	QJ234N2.MPA	170	310	52	4	168	12.7	10.5	2	397	600	1600	2200	19.5
	QJ334N2.MPA	170	360	72	4	186	12.7	10.5	2	618	965	1400	2200	41.5
	QJ1036.MPA	180	280	46	2.1	161	--	--	--	338	510	1600	2200	10.7
	QJ223N2.MPA	180	320	52	4	175	12.7	10.5	2	436	680	1500	2000	20.5
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