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
	QJ1988N2.MPA	440	600	74	4	364	15	12.5	--	761	1900	670	900	65
	QJ1088N2.MPA	440	650	94	6	382	20	15.5	--	995	2500	630	850	115
	QJ1288N2.MPA	440	790	155	7.5	615	32	20.5	--	1400	3750	560	750	350
	QJ1292N2.MPA	460	680	100	6	399	20	15.5	--	1040	2650	600	800	130
	QJ1292N2.MPA	460	830	165	7.5	645	32	20.5	--	1530	4250	530	700	415
	QJ1096N2.MPA	480	700	100	6	413	20	15.5	--	1060	2800	560	750	135
	QJ1296N2.MPA	480	870	170	7.5	675	32	20.5	--	1680	4750	500	670	470
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