Double Row Cylindrical Roller Bearings

Double Row Cylindrical Roller Bearings are a type of radial roller bearing characterized by having two rows of rolling elements (cylindrical rollers) to deliver enhanced performance and load capacity. They typically consist of solid outer rings, inner rings, and two sets of rollers. Some designs incorporate a cage (e.g., pressed steel or machined brass), while full-complement designs omit the cage to maximize the number of rollers, thereby achieving an extremely high radial load carrying capacity.

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Description
Specifications
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Key Features and Benefits
·High Radial Load Capacity: Due to the presence of two roller rows, the radial load carrying capacity is significantly higher than single-row cylindrical roller bearings, making them ideal for heavy-duty applications.
·High Rigidity: The increased number of rollers substantially enhances the radial stiffness of the bearing arrangement.
·Low Friction and High-Speed Capability: Optimized roller end and flange contact designs promote the formation of a lubricant film, resulting in lower friction and good high-speed capability (depending on the specific design and cage type).
·Separable Design: The bearing components are often separable and interchangeable, which simplifies mounting, dismounting, and maintenance inspections.
·Design Types: Common design series include NN and NNU.
·NNU Type: Features a double-ribbed outer ring and a separable inner ring.
·NN Type: Features a triple-ribbed inner ring and a separable outer ring.

Typical Applications
·Owing to their high load capacity and rigidity, double row cylindrical roller bearings are widely used in:
·Machine Tool Spindles: Where high precision, stiffness, and speed are required.
·Gear Drives/Gearboxes: Subjected to heavy and shock loads.
·Rolling Mills: Handling extremely high radial forces.
·Hoisting Machinery and Rope Sheaves.

Principal dimensions				Basic load ratings dynamic	Static	Speed Ratings Reference speed	Limiting Speed	Mass	Bearing No.
Principal dimensions				Basic load ratings dynamic	Static	Speed Ratings Reference speed	Limiting Speed	Mass
d[mm]	D[mm]	B[mm]	C[mm]	C[kN]	C0[kN]	[r/min]	[r/min]	kg
260	440	180		1980	3510	1170	1440	110	NNU 4152 M/W33
280	470	200		2430	4590	900	1350	150	315976 B
280	460	180		2295	4275	1080	1350	120	NNU 4156 M/W33
300	460	180		2340	4950	900	1350	118	BC2B 320119
320	480	175		2214	4860	855	1260	115	315583 C
320	460	120		1548	3240	855	1260	70	BC2B 322216
320	540	218		3321	5580	900	1170	200	NNU 4164 F
320	440	118		918	2124	1260	1350	57	NNUP 4964 B/HB1W33
340	520	305	200	2970	6390	810	1170	185	BC2B 320118
340	580	243		3618	6750	855	1080	260	NNU 4168 M/W33
350	520	150		1908	4050	765	1170	220	BC2B 319878
360	500	125		1845	3870	810	1170	80	BC2B 322217
370	520	220	193	2475	6030	765	1170	130	BC2B 319961
380	540	200		2574	6120	720	1080	145	BC2B 320041
380	540	130		1809	3870	720	1080	100	BC2B 326131/HB1
380	620	243		3861	7650	765	990	285	NNU 4176 M
400	560	205		2826	7020	720	1080	160	314987 B
400	560	205		2826	7020	720	1080	160	314987 C
400	600.19	200		3123	6480	675	990	248	BC2B 326363/HA4
410	600	220		3420	7785	675	990	215	316019
420	620	200		3123	7020	630	990	220	314391
420	600	220		3222	7920	675	990	206	314982
420	580	130		2142	4770	675	990	110	BC2B 326137/HB1
440	620	225		3519	8820	630	900	217	316077 A
440	640	230		4113	8820	765	900	250	BC2B 316521
440	540	100		909	2610	900	990	46	NNU 4888 KM/W33
440	540	100		1053	3060	900	990	46	NNU 4888 M/W33
457.2	660.4	228.6	203.2	3321	7335	603	855	235	BC2B 322969/HB1
460	650	235		3960	10080	603	900	260	316739 A
460	780	280	250	5049	9360	504	765	540	BC2-8004/HA1
460	760	300		5796	11610	603	765	535	NNU 4192 M
480	700	260		4851	11250	540	810	348	316189
480	790	308		6336	12870	567	720	587	NNU 4196 M/W33
500	720	218		4257	9720	540	765	299	314419
500	830	325		6732	13500	540	720	693	NNU 41/500 M/W33
530	780	475	285	6489	15570	477	720	561	BC2B 320117/HA4
530	780	225		3960	8550	477	720	350	BC2B 326064/HA1
530	870	335		7029	14400	504	675	790	NNU 41/530 K30M/W33
530	870	335		7029	14400	504	675	790	NNU 41/530 M/W33
550	800	260		5247	12060	477	675	448	316115
600	820	365		7029	19080	432	630	577	BC2-8005/HB1
600	980	375		8910	19080	432	567	1100	NNU 41/600 M/W33
650	920	335		7722	20880	387	567	740	BC2B 326894/HB1
690	980	550	357.5	8910	24300	360	540	1045	BC2-8015/HB1
690	980	365		9450	24300	360	540	1000	BC2-8074/HA5
710	1150	438		12060	25650	342	450	790	NNU 41/710 M/W33
750	1000	250		5544	14940	342	504	562	314420
800	1260	375		11520	25200	270	387	1850	BC2B 326379/HA4
950	1360	420		12600	30150	234	324	1900	BC2-8022/HA1
1319.5	1720	300		11250	31050	144	216	1820	BC2B 326372/HA1
20	42	30		47.07	51.3	7650	9000	0.2	NNCF 5004 CV
20	42	30		41.13	49.5		3060	0.2	NNF 5004 ADB-2LSV
25	47	30		53.46	63.9	6300	8100	0.23	NNCF 5005 CV
25	47	30		45.09	58.95		2700	0.24	NNF 5005 ADB-2LSV
30	55	34		66.33	79.2	5400	6750	0.35	NNCF 5006 CV
30	55	34		51.48	67.5		2340	0.37	NNF 5006 ADB-2LSV
35	62	36		80.73	100.8	4770	6030	0.46	NNCF 5007 CV
35	62	36		63.36	88.2		1980	0.48	NNF 5007 ADB-2LSV
40	68	38		95.4	126	4320	5400	0.56	NNCF 5008 CV
40	68	38		77.22	104.4		1800	0.56	NNF 5008 ADB-2LSV
45	75	40		100.8	140.4	3870	4770	0.71	NNCF 5009 CV
45	75	40		91.8	131.4		1620	0.7	NNF 5009 ADB-2LSV
50	80	40		127.8	176.4	3600	4500	0.76	NNCF 5010 CV
50	80	40		97.2	144		1530	0.76	NNF 5010 ADB-2LSV
55	90	46		171	252	3060	3870	1.16	NNCF 5011 CV
55	90	46		115.2	173.7		1350	1.18	NNF 5011 ADB-2LSV
60	85	25		70.29	123.3	3240	4050	0.49	NNC 4912 CV
60	85	25		70.29	123.3	3240	4050	0.48	NNCF 4912 CV
60	95	46		178.2	270	3060	3600	1.24	NNCF 5012 CV
60	85	25		70.29	123.3	3240	4050	0.47	NNCL 4912 CV
60	95	46		120.6	187.2		1260	1.26	NNF 5012 ADB-2LSV
65	100	46		188.1	292.5	2700	3420	1.32	NNCF 5013 CV
65	100	46		124.2	201.6		1170	1.33	NNF 5013 ADB-2LSV
70	100	30		102.6	173.7	2700	3420	0.78	NNC 4914 CV
70	100	30		102.6	173.7	2700	3420	0.77	NNCF 4914 CV
70	110	54		214.2	310.5	2520	3240	1.85	NNCF 5014 CV
70	100	30		102.6	173.7	2700	3420	0.75	NNCL 4914 CV
70	110	54		168.3	256.5		1080	1.87	NNF 5014 ADB-2LSV
75	115	54		225.9	342	2340	2880	1.93	NNCF 5015 CV
75	115	54		201.6	279		990	1.96	NNF 5015 ADB-2LSV
80	110	30		108.9	194.4	2340	3060	0.88	NNC 4916 CV
80	110	30		108.9	194.4	2340	3060	0.87	NNCF 4916 CV
80	125	60		277.2	409.5	2160	2700	2.59	NNCF 5016 CV
80	110	30		108.9	194.4	2340	3060	0.85	NNCL 4916 CV
80	125	60		225.9	373.5		900	2.68	NNF 5016 B-2LS
85	130	60		282.6	427.5	2160	2700	2.72	NNCF 5017 CV
85	130	60		243	387		900	2.83	NNF 5017 B-2LS
90	125	35		144.9	270	2160	2700	1.35	NNC 4918 CV
90	125	35		144.9	270	2160	2700	1.33	NNCF 4918 CV
90	140	67		332.1	504	1980	2520	3.62	NNCF 5018 CV
90	125	35		144.9	270	2160	2700	1.3	NNCL 4918 CV
90	140	67		287.1	495		810	3.71	NNF 5018 B-2LS
95	145	67		297	513		810	3.88	NNF 5019 B-2LS
100	140	40		188.1	360	1800	2340	1.95	NNC 4920 CV
100	140	40		188.1	360	1800	2340	1.93	NNCF 4920 CV
100	150	67		351.9	558	1800	2340	3.94	NNCF 5020 CV
100	140	40		188.1	360	1800	2340	1.9	NNCL 4920 CV
100	150	67		302.4	513		765	3.95	NNF 5020 B-2LS
110	150	40		198	387	1710	2160	2.15	NNC 4922 CV
110	150	40		198	387	1710	2160	2.12	NNCF 4922 CV
110	170	80		460.8	720	1620	1980	6.32	NNCF 5022 CV
110	150	40		198	387	1710	2160	2.1	NNCL 4922 CV
110	170	80		371.7	625.5		675	6.45	NNF 5022 B-2LS
120	165	45		217.8	432	1530	1980	2.95	NNC 4924 CV
120	165	45		217.8	432	1530	1980	2.9	NNCF 4924 CV
120	180	80		485.1	792	1530	1800	6.77	NNCF 5024 CV
120	165	45		217.8	432	1530	1980	2.85	NNCL 4924 CV
120	180	80		386.1	675		630	6.9	NNF 5024 B-2LS
130	190	80		401.4	733.5		603	7.3	319426 B-2LS
130	180	50		267.3	477	1440	1800	3.95	NNC 4926 CV
130	180	50		267.3	477	1440	1800	3.88	NNCF 4926 CV
130	200	95		688.5	1125	1350	1710	10.2	NNCF 5026 CV
130	180	50		267.3	477	1440	1800	3.8	NNCL 4926 CV
130	200	95		554.4	936		567	10.5	NNF 5026 B-2LS
140	200	80		421.2	778.5		567	8	319428 DA-2LS
140	190	50		277.2	513	1350	1710	4.2	NNC 4928 CV
140	190	50		277.2	513	1350	1710	4.15	NNCF 4928 CV
140	210	95		728.1	1233	1260	1620	11.1	NNCF 5028 CV
140	190	50		277.2	513	1350	1710	4.1	NNCL 4928 CV
140	210	95		579.6	1008		540	11	NNF 5028 B-2LS
150	210	80		435.6	823.5		540	8.4	319430 B-2LS
150	190	40		229.5	526.5	1350	1620	2.9	NNC 4830 CV
150	210	60		386.1	747	1260	1530	6.65	NNC 4930 CV
150	190	40		229.5	526.5	1350	1620	2.8	NNCF 4830 CV
150	210	60		386.1	747	1260	1530	6.55	NNCF 4930 CV
150	225	100		757.8	1287	1170	1530	13.3	NNCF 5030 CV
150	190	40		229.5	526.5	1350	1620	2.7	NNCL 4830 CV
150	210	60		386.1	747	1260	1530	6.45	NNCL 4930 CV
150	225	100		673.2	1161		504	13.5	NNF 5030 B-2LS
160	220	80		450.9	900		477	8.8	319432 DA-2LS
160	200	40		234	549	1260	1530	3.1	NNC 4832 CV
160	220	60		401.4	823.5	1170	1440	7	NNC 4932 CV
160	200	40		234	549	1260	1530	3	NNCF 4832 CV
160	220	60		401.4	823.5	1170	1440	6.9	NNCF 4932 CV
160	240	109		856.8	1440	1080	1350	16.2	NNCF 5032 CV
160	200	40		234	549	1260	1530	2.9	NNCL 4832 CV
160	220	60		401.4	823.5	1170	1440	6.8	NNCL 4932 CV
160	240	109		702.9	1260		450	16.5	NNF 5032 B-2LS
170	230	80		460.8	954		477	9.2	319434 B-2LS
170	215	45		257.4	589.5	1170	1440	4	NNC 4834 CV
170	230	60		411.3	855	1080	1350	7.35	NNC 4934 CV
170	215	45		257.4	589.5	1170	1440	4	NNCF 4834 CV
170	230	60		411.3	855	1080	1350	7.2	NNCF 4934 CV
170	260	122		1107	1908	990	1260	23	NNCF 5034 CV
170	215	45		257.4	589.5	1170	1440	3.9	NNCL 4834 CV
170	230	60		411.3	855	1080	1350	7.1	NNCL 4934 CV
170	260	122		909	1620		432	22.5	NNF 5034 B-2LS
180	240	80		475.2	990		432	9.8	319436 DA-2LS
180	225	45		267.3	625.5	1080	1350	4.3	NNC 4836 CV
180	250	69		534.6	1098	990	1260	10.8	NNC 4936 CV
180	225	45		267.3	625.5	1080	1350	4.2	NNCF 4836 CV
180	250	69		534.6	1098	990	1260	10.7	NNCF 4936 CV
180	280	136		1278	2250	990	1170	30.5	NNCF 5036 CV
180	225	45		267.3	625.5	1080	1350	4.1	NNCL 4836 CV
180	250	69		534.6	1098	990	1260	10.5	NNCL 4936 CV
180	280	136		1053	1908		405	30.8	NNF 5036 B-2LS
190	260	80		495	1062		405	12.7	319438 DA-2LS
190	240	50		322.2	675	990	1260	5.65	NNC 4838 CV
190	260	69		544.5	1161	990	1260	11.2	NNC 4938 CV
190	240	50		322.2	675	990	1260	5.5	NNCF 4838 CV
190	260	69		544.5	1161	990	1260	11.1	NNCF 4938 CV
190	290	136		1323	2340	900	1170	31.5	NNCF 5038 CV
190	240	50		322.2	675	990	1260	5.3	NNCL 4838 CV
190	260	69		544.5	1161	990	1260	10.9	NNCL 4938 CV
190	290	136		1071	1980		387	31.5	NNF 5038 B-2LS
200	270	80		564.3	1233		450	13.1	319440 B-2LS
200	250	50		332.1	720	990	1260	5.9	NNC 4840 CV
200	280	80		633.6	1350	900	1170	15.8	NNC 4940 CV
200	250	50		332.1	720	990	1260	5.8	NNCF 4840 CV
200	280	80		633.6	1350	900	1170	15.6	NNCF 4940 CV
200	310	150		1512	2745	855	1080	41	NNCF 5040 CV
200	250	50		332.1	720	990	1260	5.7	NNCL 4840 CV
200	280	80		633.6	1350	900	1170	15.3	NNCL 4940 CV
200	310	150		1305	2610		360	42	NNF 5040 B-2LS
220	300	95		792	1674		342	18.9	319444 B-2LS
220	270	50		316.8	778.5	900	1080	6.4	NNC 4844 CV
220	300	80		663.3	1440	855	1080	17.2	NNC 4944 CV
220	270	50		342	778.5	900	1080	6.3	NNCF 4844 CV
220	300	80		663.3	1440	855	1080	17	NNCF 4944 CV
220	340	160		1809	3240	765	990	51.3	NNCF 5044 CV
220	270	50		342	778.5	900	1080	6.2	NNCL 4844 CV
220	300	80		663.3	1440	855	1080	16.8	NNCL 4944 CV
220	340	160		1449	2790		324	53.8	NNF 5044 B-2LS
240	320	95		856.8	1836		324	20.1	319448 B-2LS
240	300	60		485.1	1161	810	990	10	NNC 4848 CV
240	320	80		702.9	1584	765	990	18.5	NNC 4948 CV
240	300	60		485.1	1161	810	990	9.9	NNCF 4848 CV
240	320	80		702.9	1584	765	990	18.3	NNCF 4948 CV
240	360	160		1908	3510	720	900	56	NNCF 5048 CV
240	300	60		485.1	1161	810	990	9.8	NNCL 4848 CV
240	320	80		702.9	1584	765	990	17.9	NNCL 4948 CV
240	360	160		1512	3015		306	57.5	NNF 5048 B-2LS
260	340	95		891	1944		306	22	319452 B-2LS
260	320	60		504.9	1260	720	900	11	NNC 4852 CV
260	320	60		504.9	1260	720	900	10.8	NNCF 4852 CV
260	360	100		1053	2295	675	855	31.6	NNCF 4952 CV
260	400	190		2574	4590	630	810	85.5	NNCF 5052 CV
260	320	60		504.9	1260	720	900	10.6	NNCL 4852 CV
260	360	100		1053	2295	675	855	31.2	NNCL 4952 CV
260	400	190		2178	4185		270	86.2	NNF 5052 B-2LS
280	350	69		663.3	1674	675	855	16	NNC 4856 CV
280	350	69		663.3	1674	675	855	15.8	NNCF 4856 CV
280	380	100		1089	2430	630	810	33.5	NNCF 4956 CV
280	420	190		2628	4770	603	765	90.5	NNCF 5056 CV
280	350	69		663.3	1674	675	855	15.6	NNCL 4856 CV
280	380	100		1089	2430	630	810	33	NNCL 4956 CV
280	420	190		2295	4500		252	91	NNF 5056 B-2LS
300	380	80		772.2	1908	630	765	23	NNC 4860 CV
300	420	118		1512	3375	603	720	53	NNC 4960 CV
300	380	80		772.2	1908	630	765	22.5	NNCF 4860 CV
300	420	118		1512	3375	603	720	52.5	NNCF 4960 CV
300	460	218		3168	5895	540	675	130	NNCF 5060 CV
300	380	80		772.2	1908	630	765	22	NNCL 4860 CV
300	420	118		1512	3375	603	720	52	NNCL 4960 CV
320	400	80		807.3	2052	567	720	24	NNC 4864 CV
320	400	80		807.3	2052	567	720	23.5	NNCF 4864 CV
320	440	118		1584	3645	540	675	55.5	NNCF 4964 CV
320	480	218		3321	6255	504	630	135	NNCF 5064 CV
320	400	80		807.3	2052	567	720	23	NNCL 4864 CV
320	440	118		1584	3645	540	675	55	NNCL 4964 CV
340	420	80		821.7	2160	540	675	25.5	NNC 4868 CV
340	420	80		821.7	2160	540	675	25	NNCF 4868 CV
340	460	118		1611	3825	504	630	58.5	NNCF 4968 CV
340	520	243		3960	7470	477	603	185	NNCF 5068 CV
340	420	80		821.7	2160	540	675	25.5	NNCL 4868 CV
340	460	118		1611	3825	504	630	57.8	NNCL 4968 CV
360	440	80		841.5	2295	504	630	26.5	NNCF 4872 CV
360	480	118		1647	4050	477	603	61.5	NNCF 4972 CV
360	540	243		3762	7785	450	567	195	NNCF 5072 CV
360	440	80		841.5	2295	504	630	26	NNCL 4872 CV
360	480	118		1647	4050	477	603	60.8	NNCL 4972 CV
380	480	100		1260	3285	477	603	44.8	NNCF 4876 CV
380	520	140		2142	5130	450	567	91.5	NNCF 4976 CV
380	560	243		4212	8235	432	540	200	NNCF 5076 CV
380	480	100		1260	3285	477	603	44	NNCL 4876 CV
380	520	140		2142	5130	450	567	90.5	NNCL 4976 CV
400	500	100		1278	3375	450	567	46.2	NNCF 4880 CV
400	540	140		2178	5400	432	540	95.5	NNCF 4980 CV
400	600	272		4950	9900	405	504	270	NNCF 5080 CV
400	500	100		1278	3375	450	567	45.9	NNCL 4880 CV
400	540	140		2178	5400	432	540	94.5	NNCL 4980 CV

Engineering the Future of Motion

About UKL

Founded in 2020, UKL Bearing Manufacturing Co., Ltd. (Wuxi) is China Double Row Cylindrical Roller Bearings suppliers and OEM/ODM Double Row Cylindrical Roller Bearings company, an integrated industrial and trading enterprise that focuses on precision manufacturing, combining R&D, production, and sales.
The company specializes in high-performance bearing solutions, providing technical support for global industries with exceptionally high demands for precision and reliability.

With more than 200 skilled professionals and a fully modernized production base, UKL’s facilities cover the entire manufacturing process — forging, annealing, turning, heat treatment, grinding, and automated assembly.
Leveraging over 15 years of OEM/ODM export experience, UKL responds quickly to customer needs, offering flexible and customized services for clients across Europe, Asia, Africa, and the Middle East.

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