Double Row Cylindrical Roller Bearings

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Design Variants

Misalignment

Cage

Tolerance

Internal clearance

Double row cylindrical roller bearings are separable no-locating bearings, which make it mounting or dismounting easy, and both of the bearing rings may be mounted with heavy interference fit to shaft and housing so these bearings only have two basic type

NN type: inner ring with three integral flanges,outer ring without flange

NNU type: outer ting have three integral flanges,inner ring without flange.

These bearings are available either with or without tapered bores as standard, the suffix K means bore taper 1:12, the taper bores allow the radial internal clearance to be adjusted to the best value during mounting. These bearings also feature lubrication groove and holes on their outer rings as standard. Suffix W33.

Double row cylindrical roller bearings are separable no-locating bearings, which make it mounting or dismounting easy, and both of the bearing rings may be mounted with heavy interference fit to shaft and housing so these bearings only have two basic type
NN type: inner ring with three integral flanges,outer ring without flange
NNU type: outer ting have three integral flanges,inner ring without flange.
These bearings are available either with or without tapered bores as standard, the suffix K means bore taper 1:12, the taper bores allow the radial internal clearance to be adjusted to the best value during mounting. These bearings also feature lubrication groove and holes on their outer rings as standard. Suffix W33.
Double row cylindrical roller bearings are not able to accommodate misalignments.
DHK double row cylindrical roller bearings are produced with roller riding solid brass cages as standard.

Double row cylindrical roller bearings are frequently used as spindle bearings, normally they are produced to special tolerance class SP.

DHK can provide these bearings with such as P5 class upon request.

Detailed tolerance values for DHK double row cylindrical roller bearings are listed in chapter of tolerance class SP, page 13.

Tolerances for DHK high precision Double row cylindrical roller bearings (excluding tapered roller bearings)

All dimensions shown in (mm):

Tolerances in (um):

Tolerance class SP of DHK high precision Double row cylindrical roller bearings

Inner Ring

PN/(Normal)

Nominal Bore diameter		Deviation	Variation	Deviation/ Variation			Ring width deviation	Ring width Variation	Radial runout	Side face runout	Side face runout
>	<=	△dmp	Vdp	△ds	Vdp	△d1mp -dmp	△Bs	vbs	kia	sd	sia
18 30		0 -6	3	+10 0	3	+4 0	0 -100	5	3	8	8
30 50		0 -8	4	+12 0	4	+6 0	0 -120	5	4	8	8
50 80		0 -9	5	+15 0	5	+8 0	0 -150	6	4	8	8
80 120		0 -10	5	+20 0	5	+8 0	0 -200	7	5	9	9
120 180		0 -13	7	+25 0	7	+10 0	0 -250	8	6	10	10
180 250		0 -15	8	+30 0	8	+12 0	0 -300	10	8	11	13
250 315		0 -18	9	+35 0	9	+12 0	0 -350	13	8	13	15
315 400		0 -23	12	+40 0	12	+14 0	0 -400	15	10	15	20
400 500		0 -27	14	+45 0	14		0 -450	17	10	17	23
500 630		0 -30		+50 0			0 -500	20	12	20	25
630 800		0 -40		+65 0			0 -750	30	15	23	30
800 1000		0 -50		+75 0			0 -1000	33	17	30	40
1000 1250		0 -65		+90 0			0 -1250	40	20	40	50

Outer ring

PN/(Normal)

Nominal outer diameter		Deviation	Variation	Radial runout	Side face runout	Side face runout
>	<=	△Dmp	VDp	Kea	SD	Sea
30 50		0 -7	4	5	8	8
50 80		0 -9	5	5	8	10
80 120		0 -10	5	6	9	11
120 150		0 -11	6	7	10	13
150 180		0 -13	7	8	10	14
180 250		0 -15	8	10	11	15
250 315		0 -18	9	11	13	18
315 400		0 -20	10	13	13	20
400 500		0 -23	12	15	15	23
500 630		0 -28	14	17	18	25
630 800		0 -35	18	20	20	30
800 1000		0 -40		25	30	40
1000 1250		0 -50		30	40	55

The width tolerances △Cs and VCs are identical to △Bs and Vbs of the inner ring of the same bearing.

Double row cylindrical roller bearings are frequently produced with reduced internal radial clearance group (C1). Must note bearing parts of these bearings could not be exchanged.

DHK can provide these bearings with other clearance group upon request.

For the detailed values please see the chapter of internal clearance of cylindrical roller bearings,page 128.

Internal Clearance Groups Of DHK Cylindrical Roller Bearings With Cylindrical Bore

Bore Dia.(mm)
>	<=	C1（um）	C2（um）	CN（um）	C3（um）	C4（um）	C5（um）
-- 24		5 15	0 25	20 45	35 60	50 75	75 100
24 30		5 15	0 25	20 45	35 60	50 75	75 100
30 40		5 15	5 30	25 50	45 70	60 85	85 110
40 50		5 18	5 35	30 60	50 80	70 100	100 130
50 65		5 20	10 40	40 70	60 90	80 100	110 140
65 80		10 25	10 45	40 75	65 100	90 125	125 160
80 100		10 30	15 50	50 85	75 110	105 140	140 175
100 120		10 30	15 55	50 90	85 125	125 165	165 205
120 140		10 35	15 60	60 105	100 145	145 190	190 235
140 160		10 35	20 70	70 120	115 165	165 215	215 265
160 180		10 40	25 75	75 125	120 170	170 220	220 270
180 200		15 45	35 90	90 145	140 195	195 250	250 305
200 225		15 50	45 105	105 165	160 220	220 280	280 340
225 250		15 50	45 110	110 175	170 235	235 300	300 365
250 280		20 55	55 125	125 195	190 260	260 330	330 400
280 315		20 60	55 130	130 205	200 275	275 350	350 425
315 355		20 65	65 145	145 225	225 305	305 385	385 465
355 400		25 75	100 190	190 280	280 270	570 460	460 550
400 450		25 85	110 210	210 310	310 410	410 510	510 610
450 500		25 95	110 220	220 330	330 440	440 550	550 660
500 560		25 100	120 240	240 360	360 480	480 600	600 720
560 630		30 110	140 260	260 380	380 500	500 620	620 740
630 710		30 130	145 285	285 425	425 565	565 705	705 845
710 800		35 140	150 310	610 470	470 630	630 790	790 950
800 900		35 160	180 350	350 520	520 690	690 860	860 1030
900 1000		35 170	200 390	390 580	580 770	770 960	960 1150
1000 1120		50 200	220 430	430 640	640 850	850 1060	1060 1270
1120 1250		50 200	230 470	470 710	710 950	950 1190	1060 1270
1250 1400		50 200	270 530	530 790	790 1050	1050 1310	1060 1270
1400 1600		50 200	330 610	610 890	890 1170	1170 1450	1060 1270
1600 1800		50 200	380 700	700 1020	1020 1340	1340 1660	1060 1270
1800 2000		50 200	400 760	760 1120	1120 1480	1480 1840	1060 1270

Internal clearance groups of DHK cylindrical roller bearings with tapered bore

Bore Dia.(mm)
>	<=	C1（um）	C2（um）	CN（um）	C3（um）	C4（um）	C5（um）
-- 24		10 20	15 40	30 55	40 65	50 75	75 100
24 30		15 25	20 45	35 60	45 70	55 80	80 105
30 40		15 25	20 45	40 65	55 80	70 95	95 120
40 50		17 30	25 55	45 75	60 90	75 105	105 135
50 65		20 35	30 60	50 80	70 100	90 120	120 150
65 80		25 40	35 70	60 95	85 120	110 145	145 180
80 100		35 55	40 75	70 105	95 130	120 155	155 190
100 120		40 60	50 90	90 130	115 155	140 180	180 220
120 140		45 70	55 100	100 145	130 175	160 205	205 250
140 160		50 75	60 110	110 160	145 195	180 230	230 280
160 180		55 85	75 125	126 175	160 210	195 245	245 295
180 200		60 90	85 140	140 195	180 235	220 275	275 330
200 225		60 95	95 155	155 215	200 260	245 305	305 365
225 250		65 100	105 170	170 235	220 285	270 335	335 400
250 280		75 110	115 185	185 255	240 310	295 365	365 435
280 315		80 120	130 205	205 280	265 340	325 400	400 475
315 355		90 135	145 250	225 304	290 370	355 435	435 515
355 400		100 150	165 255	225 345	330 420	405 495	495 585
400 450		110 170	185 285	285 385	370 470	455 555	555 655
450 500		120 190	205 315	315 425	410 520	505 615	615 725
500 560		130 210	230 350	350 470	455 575	560 680	680 800
560 630		140 230	260 380	380 500	500 620	620 740	740 860
630 710		160 260	295 435	435 575	565 705	685 835	935 975
710 800		170 290	325 485	485 645	630 790	775 935	935 1095
800 900		190 330	370 540	540 710	700 870	860 1030	1030 1200
900 1000		210 360	410 600	600 790	780 970	960 1150	1150 1340
1000 1120		230 400	455 665	665 875	865 1075	1065 1275	1275 1485
1120 1250		230 400	490 730	730 970	960 1200	1200 1440	1275 1485
1250 1400		230 400	550 810	810 1070	1070 1330	1330 1590	1275 1485
1400 1600		230 400	640 920	920 1200	1200 1480	1480 1760	1275 1485
1600 1800		230 400	700 1020	1020 1340	1340 1660	1660 1980	1275 1485
1800 2000		230 400	760 1120	1120 1480	1480 1840	1840 2200	1275 1485

Dimensions and Parameters

Inquiry	Bearing No.	Boundary dimensions(mm)				Basic load ratings(kN)		Limiting speed(rpm)		Bearing dimension				Weight (kg)
Inquiry	Bearing No.	d	D	B	r1 r2 min	Dynamic(Cr)	Static(Cor)	Grease	Oil	E	F	Bs ≈	S ≈	Weight (kg)
	NN 3038 M/W33	190	290	75	2.1	585	1040	2600	3200	265	--	12.2	4.8	18
	NN 3038 K/M/W33	190	290	75	2.1	585	1040	2600	3200	265	--	12.2	4.8	18
	NNU 4138 K/M/W33	190	320	128	3	1320	2200	1800	2400	--	222	11.1	4	41
	NNU 4138 M/W33	190	320	128	3	1320	2200	1800	2400	--	222	11.1	4	41
	NNU 4840 M/W33	200	250	50	1.1	242	600	2400	2600	--	216	11.1	2.6	5.75
	NNU 4840 K/M/W33	200	250	50	1.1	242	600	2400	2600	--	216	11.1	2.6	5.75
	NNU 4940 M/W33	200	280	80	2.1	490	1040	2600	3200	--	225	12.2	3.4	14.9
	NNU 4940 K/M/W33	200	280	80	2.1	490	1040	2600	3200	--	225	12.2	3.4	14.9
	NN 3040 M/W33	200	310	82	2.1	655	1200	2400	3000	282	--	12.2	5.3	23
	NN 3040 K/M/W33	200	310	82	2.1	655	1200	2400	3000	282	--	12.2	5.3	23
	NNU 4140 M/W33	200	340	140	3	1470	2550	1700	2200	--	235	11.1	5.3	51
	NNU 4944 M/W33	220	300	80	2.1	510	1140	2400	3000	--	245	12.2	3.4	16.2
	NNU 4944 K/M/W33	220	300	80	2.1	510	1140	2400	3000	--	245	12.2	3.4	16.2
	NN 3044 M/W33	220	340	90	3	800	1460	2200	2800	310	--	15	4.5	33
	NN 3044 K/M/W33	220	340	90	3	800	1460	2200	2800	310	--	15	4.5	33
	NNU 4144 K/M/W33	220	370	150	4	1650	2900	1500	2000	--	258	13.9	5.5	65
	NNU 4144 M/W33	220	370	150	4	1650	2900	1500	2000	--	258	13.9	5.5	65
	NNU 4848 K/M/W33	240	300	60	1.1	358	930	2200	2400	--	259	11.1	2.8	9.9
	NNU 4848 M/W33	240	300	60	1.1	358	930	2200	2400	--	259	11.1	2.8	9.9
	NNU 4948 M/W33	240	320	80	2.1	530	1200	2200	2800	--	265	12	3.4	17.4
	NNU 4948 K/M/W33	240	320	80	2.1	530	1200	2200	2800	--	265	12	3.4	17.4
	NN 3048 M/W33	240	360	92	3	850	1560	2000	2600	330	--	15	6	36
	NN 3048 K/M/W33	240	360	92	3	850	1560	2000	2600	330	--	15	6	36
	NNU 4148 K/M/W33	240	400	160	4	1980	3650	1400	1800	--	282	13.9	4.6	85
	NNU 4148 M/W33	240	400	160	4	1980	3650	1400	1800	--	282	13.9	4.6	85
	NNU 4952 M/W33	260	360	100	2.1	750	1700	2000	2600	--	292	15	4	60.2
	NNU 4952 K/M/W33	260	360	100	2.1	750	1700	2000	2600	--	292	15	4	30.2
	NN 3052 M/W33	260	400	104	4	1060	2000	1900	2400	364	--	15	6.5	48
	NN 3052 K/M/W33	260	400	104	4	1060	2000	1900	2400	364	--	15	6.5	48
	NNU 4052 K/M/W33	260	400	104	4	1650	3150	1500	1800	--	295	13.9	5.5	63.5
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