Double Row Cylindrical Roller Bearing|Rolling mill bearings|Precision Bearings|Products|NewBee Transmission

Rolling mill bearings

Double Row Cylindrical Roller Bearing

Double row cylindrical roller bearings are separable bearings, allowing for easy assembly and disassembly. They feature a compact structure, high rigidity, and large load-bearing capacity with minimal deformation under load. Available in cylindrical bore or tapered bore (suffix K) designs, the tapered bore variant enables radial clearance adjustment during installation. These bearings can accommodate certain axial displacement between the shaft and housing, functioning as non-locating bearings.

Bearing rings and rolling elements: GCr15, GCr15SiMn, G20Cr2Ni4A

Types:

NN series: Inner ring with two ribs, outer ring without ribs

NNU series: Outer ring with two ribs, inner ring without ribs

Size Range:

Bore Diameter: 200 – 1500 mm (Customizable within the scope)

Outer Diameter: 250 – 2300 mm

Precision Classes: P0, P6, P5, P4

Clearance Groups: C0, C3, C4

Operating Temperature: -40°C to +120°C

Lubrication: Grease, Oil, or Customized

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Techspecs

Double Row Cylindrical Roller Bearings
Designations		Boundary				Basic load ratings		Structure size		Installation dimersion						Mass
Designations		mm				kN		mm		mm						kg
Current	Original	d	D	B	rmin	Cr	Cor	Fw	Ew	damin	damax	Damin	Damax	dbmin	ramax	kg
NB.NN 3940	3282940	200	280	60	2.1	420	815	-	259	216	221	263	-	-	2	10.6
NB.NN 4940K/W20	4182940Y		280	80	2.1	484	960	-	259	211	222	264	269	-	2	14.1
NB.NN 4940	4282940		280	80	2.1	570	1220	-	259	211	222	264	269	-	2	15.3
NB.NNU 4940	4482940		280	80	2.1	570	1220	225	-	211	222	-	269	228	2	15.3
NB.NN 3040	3282140		310	82	2.1	655	1170	-	282	211	-	285	299	-	2	22.7
NB.NNU 3040	3482140		310	82	2.1	655	1170	232	-	211	223	-	293	237	2	22.7
NB.NN 4040	4282140		310	109	2.1	890	1730	-	282	216	225	293	-	-	2	30.4
NB.NN 3944	3282944	220	300	60	2.1	440	895	-	279	236	241	-	283	-	2	11.4
NB.NN 4944	4282944		300	80	2.1	600	1330	-	279	236	242	-	283	-	2	16.6
NB.NNU 4944	4482944		300	80	2.1	600	1330	245	-	231	242	-	289	249	2	16.6
NB.NN 3044	3282144		340	90	3	815	1480	-	310	233	-	313	327	-	2.5	29.6
NB.NNU 3044	3482144		340	90	3	815	1480	254	-	230	-	313	327	-	2.5	30
NB.NN 4044	4282144		340	118	3	1190	2400	-	310	233	-	313	327	-	2.5	39.8
NB.NN 3144	3282744		370	120	4	1050	1810	-	331	241	-	-	346	-	3	51.9
NB.NNU 3144	3482744		370	120	4	1050	1810	263	-	241	-	-	346	268	3	52.3
Designations		Boundary				Basic load ratings		Structure size		Installation dimersion						Mass
Designations		mm				kN		mm		mm						kg
Current	Original	d	D	B	rmin	Cr	Cor	Fw	Ew	damin	damax	Damin	Damax	dbmin	ramax	kg
NB.NN 4848	4282848	240	300	60	1.1	405	1030	-	283	248	255	287	290	-	1	9.77
NB.NNU4848	-		300	60	1.1	358	930	259	-	248	255	-	290	263	1	9.9
NB.NN 3948	3282948		320	60	2.1	460	975	-	300	251	262	-	309	-	2	12.2
NB.NN 4948	4282948		320	80	2.1	625	1450	-	300	251	262	-	309	-	2	17.9
NB.NNU 4948	4482948		320	80	2.1	625	1450	263	-	251	262	-	309	269	2	18
NB.NN 3048	3282148		360	92	3	855	1600	-	330	253	-	333	347	-	2.5	32.7
NB.NNU 3048	3482148		360	92	3	855	1600	274	-	253	266	-	347	280	2.5	32.7
NB.NN 4048	4282148		360	118	3	1240	2600	-	330	253	266	333	347	-	2.5	39.3
NB.NNU 4048	4482148		360	118	3	1240	2600	274	-	253	266	-	347	281	2.5	42.7
NB.NN 3148	3282748		400	128	4	1170	2040	-	358	256	-	362	384	-	3	64.2
NB.NNU 4148	4482748		400	160	4	1880	3530	282	-	256	282	-	384	291	3	85
NB.NN 3952	3282952	260	360	75	2.1	670	1380	-	335	271	288	-	349	-	2	21.4
NB.NN 4952K	4182952		360	100	2.1	711	1540	-	335	271	288	-	349	-	2	29.2
NB.NN 4952	4282952		360	100	2.1	935	2100	-	335	271	288	-	349	-	2	28.3
NB.NNU 4952	4482952		360	100	2.1	935	2100	292	-	271	288	-	349	296	2	31.1
Designations		Boundary				Basic load ratings		Structure size		Installation dimersion						Mass
Designations		mm				kN		mm		mm						kg
Current	Original	d	D	B	rmin	Cr	Cor	Fw	Ew	damin	damax	Damin	Damax	dbmin	ramax	kg
NB.NN 3052K	3182152	260	400	104	4	969	1810	-	364	276	-	367	384	-	3	47.1
NB.NN 3052	3282152		400	104	4	969	1810	-	364	276	-	367	384	-	3	48.5
NB.NN 4052	4282152		400	140	4	1550	3250	-	364	276	-	369	384	-	3	59.7
NB.NNU 4052	4482152		400	140	4	1550	3250	300	-	276	289	-	384	299	3	65
NB.NN 3152	3282752		440	144	4	1480	2660	-	393	276	-	415	424	-	3	89.1
NB.NNU4152	4482752		440	180	4	2200	4000	306	-	276	300	-	424	310	3	113
NB.NN 4856	4282856	280	350	69	1.1	445	1160	-	329	287.5	-	-	340	-	1	15.3
NB.NNU4856K	-		350	69	2	457	1200	303	-	287.5	298	-	340	307	1	15.5
NB.NN 3956	3282956		380	75	2.1	695	1460	-	355	291	-	-	369	-	2	22.7
NB.NN 4956	4284956		380	100	2.1	960	2230	-	355	291	-	-	369	-	2	32.9
NB.NNU 4956	4482956		380	100	2.1	960	2230	312	-	291	308	-	369	316	2	33
NB.NN 3056K	3182156		420	106	4	1020	1950	-	384	296	-	387	404	-	3	49.1
NB.NN 3056	3282156		420	106	4	1020	1950	-	384	296	-	387	404	-	3	49.9
NB.NNU3056	-		420	106	4	1080	2080	320	-	300	-	-	440	326	3	51.4
NB.NN 3156	3282756		460	146	5	1520	2790	-	413	300	-	416	440	-	4	95.7
Designations		Boundary				Basic load ratings		Structure size		Installation dimersion						Mass
Designations		mm				kN		mm		mm						kg
Current	Original	d	D	B	rmin	Cr	Cor	Fw	Ew	damin	damax	Damin	Damax	dbmin	ramax	kg
NB.NNU 4860	4482860	300	380	80	2.1	690	1760	324	-	308	320	-	369	330	2	21.7
NB.NN 4960	4282960		420	118	3	1230	2870	-	388	314	335	-	398	-	2.5	51.6
NB.NNU 4960	4482960		420	118	3	1230	2870	339	-	314	335	-	406	343	2.5	51.9
NB.NN 3060	3282160		460	118	4	1180	2250	-	418	316	-	421	444	-	3	71.7
NB.NN 3060K	3182160		460	118	4	1180	2250	-	418	316	-	421	444	-	3	69.6
NB.NN4060	-		460	160	4	1920	4100	-	418	316	-	-	440	-	3	97.6
NB.NN 3160	3282760		500	160	5	1760	3150	-	448	320	-	450	480	-	4	125
NB.NNU 3160	3482760		500	160	5	1760	3150	358	-	320	-	-	480	365	4	126
NB.NNU 4864	4482864	320	400	80	2.1	700	1840	346	-	328	340	-	389	350	2	22.8
NB.NN 4964	4282964		440	118	3	1260	3050	-	408	334	355	-	427	-	2.5	50.2
NB.NN 4964K	4182964		440	118	3	1260	3050	-	408	334	355	-	427	-	2.5	52
NB.NNU 4964	4482964		440	118	3	1260	3050	359	-	334	355	-	426	363	2.5	54.9
NB.NN 3064	3282164		480	121	4	1350	2670	-	438	336	-	442	464	-	3	76.6
NB.NNU 3064	3482164		480	121	4	1350	2670	366	-	336	353	442	464	-	3	76.9
NB.NNU 4064	4482164		480	160	4	1960	4300	367	-	336	353	-	464	364	3	103
Designations		Boundary				Basic load ratings		Structure size		Installation dimersion						Mass
Designations		mm				kN		mm		mm						kg
Current	Original	d	D	B	rmin	Cr	Cor	Fw	Ew	damin	damax	Damin	Damax	dbmin	ramax	kg
NB.NNU 3164	3482764	320	540	176	5	2090	3750	384	-	340	379	-	520	389	4	154
NB.NN 3968	3282968	340	460	90	3	905	2020	-	428	353	375	-	447	-	2.5	42.9
NB.NN 4968K	4182968		460	118	3	1040	2450	-	428	353	375	-	447	-	2.5	53.8
NB.NN 4968	4282968		460	118	3	1350	3400	-	428	353	375	-	447	-	2.5	52.1
NB.NNU 4968	4482968		460	118	3	1350	3400	379	-	354	375	-	446	383	2.5	57.8
NB.NN 3068K	3182168		520	133	5	1560	3020	-	473	360	-	477	500	-	4	101
NB.NN 3068	3282168		520	133	5	1560	3020	-	473	360	-	477	500	-	4	104
NB.NNU3068	3482168		520	133	5	1560	3020	387	-	360	-	-	500	400	4	104
NB.NNU 4068	4482168		520	180	5	2420	5350	385	-	360	377	-	500	389	4	141
NB.NN 3972	3282972	360	480	90	3	930	2130	-	448	373	-	453	467	-	2.5	44.9
NB.NNU 4972	4482972		480	118	3	1390	3550	399	-	374	395	-	466	403	2.5	60.6
NB.NN 3072	3282172		540	134	5	1630	3240	-	493	380	-	497	520	-	4	106
NB.NN 3072K	3182172		540	134	5	1630	3240	-	493	380	-	497	520	-	4	106
NB.NNU 3072	3482172		540	134	5	1630	3240	413	-	380	-	-	520	420	4	108
NB.NN 4072	3282172		540	180	5	2530	5450	-	496	380	397	-	520	-	4	132
Designations		Boundary				Basic load ratings		Structure size		Installation dimersion						Mass
Designations		mm				kN		mm		mm						kg
Current	Original	d	D	B	rmin	Cr	Cor	Fw	Ew	damin	damax	Damin	Damax	dbmin	ramax	kg
NB.NN 3084	3282184	420	620	150	5	2130	4450	-	568	440	-	574	600	-	4	154
NB.NNU 3084	3482184		620	150	5	2130	4450	478	-	440	-	-	600	474	4	155
NB.NN 4084	4282184		620	200	5	3150	7100	-	571	440	-	574	600	-	4	189
NB.NNU 4084	4482184		620	200	5	3400	7850	469	-	440	460	-	600	474	4	209
NB.NNU 3184	3482784		700	224	6	3550	6800	501	-	444	-	-	660	508	5	347
NB.NNU 4888	4482888	440	540	100	2.1	950	2790	470	-	448	464	-	529	476	2	49.5
NB.NN 3088	3282188		650	157	6	2360	4900	-	596	466	-	600	624	-	5	177
NB.NNU 3088	3482188		650	157	6	2360	4900	500	-	466	-	-	624	507	5	178
NB.NN 3188	3282788		720	226	6	3500	6800	-	649	466	-	-	680	-	5	357
NB.NNU4892	4482892	460	580	118	3	1200	3600	497	-	474	489	-	566	502	2.5	76
NB.NN 3992	3282992		620	118	4	1610	3700	-	578	476	504	-	604	-	3	94.5
NB.NNU 4992	4482992		620	160	4	2400	6200	510	-	476	504	-	604	515	3	140
NB.NN 3092K	3182192		680	163	6	2470	5070	-	624	484	-	627	654	-	5	204
NB.NN 3092	3282192		680	163	6	2470	5070	-	624	484	-	627	654	-	5	204
NB.NN 4996	4282996	480	650	170	5	2690	7000	-	607	500	-	-	630	-	4	164
Designations		Boundary				Basic load ratings		Structure size		Installation dimersion						Mass
Designations		mm				kN		mm		mm						kg
Current	Original	d	D	B	rmin	Cr	Cor	Fw	Ew	damin	damax	Damin	Damax	dbmin	ramax	kg
NB.NN 3096	3282196	480	700	165	6	2600	5550	-	643	506	-	648	674	-	5	211
NB.NNU4096	4482196		700	218	6	4300	8600	533	-	506	523	-	674	538	5	273
NB.NN 3196	3282796		790	248	7.5	4050	8100	-	708	512	-	718	758	-	6	447
NB.NNU 49/500	44829/500	500	670	170	5	2720	7200	554	-	520	548	-	650	559	4	171
NB.NN 30/500	32821/500		720	167	6	2580	5600	-	664	526	-	668	694	-	5	205
NB.NNU 30/500	34821/500		720	167	6	2580	5600	563	-	526	-	-	694	570	5	220
NB.NN 39/530	32829/530	530	710	136	5	2040	4900	-	663	550	582	-	690	-	4	149
NB.NNU 49/530	44829/530		710	180	5	2900	7050	588	-	550	582	-	690	593	4	202
NB.NN 30/530	32821/530		780	185	6	3200	6900	-	715	556	-	720	754	-	5	296
NB.NN 39/560	32829/530	560	750	140	5	2370	4860	-	705	576	-	711	735	-	4	188
NB.NNU 49/560	44829/560		750	190	5	3250	8700	623	-	580	619	-	730	628	4	239
NB.NN 6/560	2872/560		780	180	8	2400	6400	-	725	580	-	732	765	-	5	266
NB.NN 30/560K	31821/560		820	195	8	2460	6560	-	756	586	-	761	794	-	5	341
NB.NN 40/560	42821/560		820	258	6	4100	10600	-	745	586	-	-	794	-	5	472
NB.NNU 40/560	44821/560		820	258	6	5720	13100	626	-	586	615	-	794	632	5	420
Designations		Boundary				Basic load ratings		Structure size		Installation dimersion						Mass
Designations		mm				kN		mm		mm						kg
Current	Original	d	D	B	rmin	Cr	Cor	Fw	Ew	damin	damax	Damin	Damax	dbmin	ramax	kg
NB.NNU 31/560	34827/560	560	920	280	7.5	6850	13700	650	-	630	-	-	-	655	6	738
NB.NNU 49/600	44829/600	600	800	200	5	3850	10500	666	-	620	662	-	780	672	4	284
NB.NN 49/600K	41829/600		800	200	5	3450	7180	-	755	620	-	-	780	-	4	257
NB.NN 30/600	32821/600		870	200	6	3420	7785	-	803	626	-	808	844	-	5	355
NB.NNU 40/600	44821/600		870	272	6	6138	14040	664	-	626	653	-	844	670	5	530
NB.NNU 41/600	44827/600		980	375	7.5	8910	18990	699	-	633	682	-	947	706	6	1100
NB.NNU 48/630	44828/630	630	780	150	4	2290	7000	676	-	646	667	-	764	676	3	160
NB.NN 49/630	42829/630		850	218	6	4200	11400	-	793	656	-	-	824	-	5	328
NB.NNU 49/630	44829/630		850	218	6	4000	10800	704	-	656	699	-	824	710	5	356
NB.NN 30/630	32821/630		920	212	7.5	3860	8820	-	845	663	-	851	887	-	6	430
NB.NNU 40/630	44821/630		920	290	7.5	6885	15750	699	-	663	688	-	887	705	6	635
NB.NNU 41/630	44827/630		1030	400	7.5	9900	21600	734	-	663	716	-	997	740	6	1330
NB.NN 49/670	42829/670	670	900	230	6	4450	12330	-	838	696	-	-	874	-	5	419
NB.NNU 49/670	44829/670		900	230	6	4950	13100	738	-	696	732	-	874	744	5	430
NB.NN 30/670K	31821/670		980	230	7.5	4620	10260	-	901	703	-	907	947	-	6	597
Designations		Boundary				Basic load ratings		Structure size		Installation dimersion						Mass
Designations		mm				kN		mm		mm						kg
Current	Original	d	D	B	rmin	Cr	Cor	Fw	Ew	damin	damax	Damin	Damax	dbmin	ramax	kg
NB.NNU 40/670	44821/670	670	980	308	7.5	7578	17640	744	-	703	733	-	947	750	6	765
NB.NNU 41/670	44827/670	670	1090	412	7.5	10890	22950	774	-	703	756	-	1057	780	6	1500
NB.NNU 48/710	44828/710	710	870	160	4	2640	8350	759	-	726	750	-	854	759	3	203
NB.NNU49/710	44829/710		950	243	6	4850	13770	782	-	736	776	-	924	788	5	480
NB.NN 30/710	32821/710		1030	236	7.5	5148	11880	-	951	743	-	957	997	-	6	590
NB.NNU 40/710	44821/710		1030	315	7.5	8415	19440	784	-	743	772	-	997	790	6	850
NB.NNU 41/710	44827/710		1150	438	9.5	12060	25650	820	-	750	800	-	1110	826	8	1790
NB.NN 48/750	42828/750	750	920	170	5	3070	9180	-	879	770	-	887	904	-	4	240
NB.NNU 49/750	44829/750		1000	250	6	4950	14400	831	-	776	824	-	974	837	5	540
NB.NN 30/750	32821/750		1090	250	7.5	6336	14400	-	1007	783	-	1011	1057	-	6	705
NB.NNU 40/750	44821/750		1090	335	7.5	9180	21600	830	-	783	816	-	1057	836	6	925
NB.NNU 41/750	44827/750		1220	475	9.5	14490	31950	871	-	790	850	-	1180	877	8	2230
NB.NNU 49/800	44829/800	800	1060	258	6	5247	15300	884	-	826	876	-	1034	890	5	615
NB.NN 30/800	32821/800		1150	258	7.5	7029	16200	-	1065	833	-	1071	1117	-	6	790
NB.NNU 40/800	44821/800		1150	345	7.5	9720	23400	885	-	833	871	-	1117	891	6	1140
Designations		Boundary				Basic load ratings		Structure size		Installation dimersion						Mass
Designations		mm				kN		mm		mm						kg
Current	Original	d	D	B	rmin	Cr	Cor	Fw	Ew	damin	damax	Damin	Damax	dbmin	ramax	kg
NB.NNU 41/800	44827/800	800	1280	475	9.5	14850	32850	921	-	840	900	-	1240	928	8	2390
NB.NNU48/850	44828/850	850	1030	180	5	3400	11400	905	-	888	-	-	-	912	4	310
NB.NNU 49/850	44829/850		1120	272	6	5346	16200	939	-	876	930	-	1094	946	5	715
NB.NN 30/850	32821/850		1220	272	7.5	7128	16740	-	1130	883	-	1136	1187	-	6	940
NB.NNU 40/850	44821/850		1220	365	7.5	10530	25650	940	-	883	923	-	1187	947	6	1340
NB.NNU 41/850	44827/850		1360	500	6	19080	40500	976	-	897	935	-	1334	963	5	2900
NB.NNU 49/900	44829/900	900	1180	280	6	5940	18000	986	-	926	977	-	1154	993	5	805
NB.NN 30/900	32821/900		1280	280	7.5	7425	18000	-	1185	933	-	1191	1257	-	6	1050
NB.NNU 40/900	44821/900		1280	375	7.5	11520	28350	990	-	933	963	-	1257	997	6	1500
NB.NNU 41/900	44827/900		1420	515	6	19800	42750	1032	-	947	1008	-	1394	1039	5	3180
NB.NNU 49/950	44829/950	950	1250	300	7.5	6633	20160	1046	-	983	1036	-	1217	1053	6	960
NB.NN 30/950	32821/950		1360	300	7.5	8217	20160	-	1255	983	-	1263	1327	-	6	1300
NB.NNU 40/950	44821/950		1360	412	7.5	12780	31950	1050	-	983	1033	-	1327	1057	6	1900
NB.NNU 41/950	44827/950		1500	545	6	22950	51300	1092	-	997	1068	-	1474	1099	5	3830
NB.NNU 49/1000	44829/1000	1000	1320	315	7.5	7722	23400	1103	-	1033	1096	-	1287	1110	6	1250
Designations		Boundary				Basic load ratings		Structure size		Installation dimersion						Mass
Designations		mm				kN		mm		mm						kg
Current	Original	d	D	B	rmin	Cr	Cor	Fw	Ew	damin	damax	Damin	Damax	dbmin	ramax	kg
NB.NN49/1000	42829/1000	1000	1320	315	7.5	8580	25200	-	1238	1033	-	1249	1287	-	6	1200
NB.NN 30/1000	32821/1000		1420	308	7.5	9090	22050	-	1316	1033	-	1324	1387	-	6	1400
NB.NNU 40/1000	44821/1000		1420	412	7.5	13860	34200	1101	-	1033	1084	-	1387	1108	6	2000
NB.NNU 41/1000	44827/1000		1580	580	6	24750	55800	1154	-	1047	1128	-	1474	1161	5	4270
NB.NNU 49/1060	44829/1060	1060	1400	335	7.5	9450	27450	1160	-	1093	1150	-	1367	1167	6	1350
NB.NN 30/1060	32821/1060		1500	325	9.5	9900	24750	-	1391	1100	-	1399	1460	-	8	1650
NB.NNU 41/1060	44827/1060		1660	600	7.5	27270	62550	1214	-	1116	1189	-	1627	1221	6	5070
NB.NNU 49/1120	44829/1120	1120	1460	335	7.5	9450	28350	1220	-	1153	1210	-	1427	1227	6	1450
NB.NNU 41/1120	44827/1120	1120	1750	630	7.5	30240	68850	1279	-	1176	1253	-	1717	1286	6	5600
NB.NNU 49/1180	44829/1180	1180	1540	355	7.5	10710	32400	1285	-	1213	1270	-	1507	1293	6	1650
NB.NNU 41/1180	44827/1180	1180	1850	670	7.5	33210	76500	1350	-	1227	1320	-	1817	1358	6	7200
NB.NNU 41/1250	44827/1250	1250	1950	710	7.5	37620	88200	1426	-	1297	1396	-	1917	1434	6	8000
NB.NNU 49/1320	44829/1320	1320	1720	400	7.5	12420	38250	1440	-	1353	1420	-	1687	1448	6	3100
NB.NN49/1320	42829/1320		1720	400	7.5	13800	42500	-	1620	1353	-	1640	1687	-	6	3060
NB.NNU 41/1320	44827/1320		2060	750	7.5	41130	95400	1507	-	1367	1474	-	2027	1515	6	9400
Designations		Boundary				Basic load ratings		Structure size		Installation dimersion						Mass
Designations		mm				kN		mm		mm						kg
Current	Original	d	D	B	rmin	Cr	Cor	Fw	Ew	damin	damax	Damin	Damax	dbmin	ramax	kg
NB.NNU 41/1400	44827/1400	1400	2180	775	9.5	44550	104400	1598	-	1470	1564	-	2140	1608	8	10700
NB.NNU 41/1500	44827/1500	1500	2300	800	9.5	47520	118800	1709	-	1570	1674	-	2260	1718	8	12300

Description

Two rows of cylindrical rollers arranged parallel to the bearing axis Separable design simplifies installation and maintenance Tapered bore option allows for radial clearance adjustment Performance Features: High radial load capacity Enhanced rigidity and stability Low deformation under load Suitable for high-precision applications

Features

High Load Capacity

Designed to support heavy radial loads

Easy Installation

Separable design facilitates assembly and disassembly

Adjustable Clearance

Tapered bore version allows radial clearance adjustment

Axial Displacement Accommodation

Can function as non-locating bearings

Precision Options

Available in various precision classes for different applications

Working Principle

Roller Arrangement and Load Transmission: Two rows of cylindrical rollers are parallel to the bearing axis, forming a symmetrical structure that evenly distributes radial loads, reduces single-row stress, and minimizes deformation. Radial forces transfer efficiently via line contact, with high-rigidity rings ensuring heavy-load stability. Lubrication and Thermal Management: Compatible with grease, oil, and customized lubrication, it reduces friction. Low-friction design controls temperature rise; high-quality steel's thermal conductivity enables stable operation at -40°C to +120°C, avoiding precision loss. Installation and Clearance Adjustment: Separable (detachable inner/outer ring) for easy assembly, fitting standard tolerances. Tapered bore (suffix K) adjusts radial clearance via axial displacement, ensuring tight fits and optimized precision.

Application & Case

1. Machine Tool Spindles

CNC machining centers

Grinding machines

Milling and turning spindles
Double-row cylindrical roller bearings provide extremely high radial stiffness, essential for maintaining machining accuracy at high speeds.

2. Electric Motors & Generators

Large induction motors

Traction motors

Industrial generators

They handle the higher radial loads generated in heavy-duty electrical machinery, while keeping rotational accuracy.

3. Gearboxes & Speed Reducers

Industrial gear units

Rail traction gearboxes

Conveyor gear drives

Double-row cylindrical bearings support large gear loads and maintain precise gear meshing.

4. Pumps & Compressors

Centrifugal pumps

Screw compressors

Blowers

These bearings maintain radial stability under heavy hydraulic or air pressure loading.

5. Steel & Metallurgical Equipment

Rolling mills

Coil winders

Continuous casters

Steelmaking equipment requires bearings that withstand extremely high radial loads and shock loading.

6. Wind Turbine Gearboxes

High radial forces from rotor

Combined shock + vibration loads

Their rigidity and load capacity make them suitable for long-term reliability.

7. Robotics & Industrial Automation

Heavy-load robotic joints

Automated guided vehicles (AGVs)

Double-row cylindrical bearings ensure smooth, rigid motion under repetitive loading.

8. Construction Equipment

Excavators

Cranes

Drilling machines

These machines produce heavy and fluctuating loads where extra robustness is needed.

9. Paper & Printing Machinery

Paper rollers

Printing press cylinders

They handle consistent high radial loads and ensure smooth rotation for precise print quality.

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FAQ

What are the main advantages of Double Row Cylindrical Roller Bearings?

They offer high load capacity, enhanced rigidity, durability, and low maintenance requirements. Their separable design facilitates easy installation and maintenance.

How do I choose between NN and NNU series?

NN series has a double-ribbed inner ring, while NNU series has a double-ribbed outer ring. The choice depends on the specific application requirements and mounting configuration.

What is the benefit of tapered bore bearings?

Tapered bore bearings (K suffix) allow for adjustment of radial clearance during installation, providing better control over bearing fit and performance.

Can these bearings accommodate axial loads?

No, double row cylindrical roller bearings are designed primarily for radial loads. They can accommodate limited axial displacement but cannot support substantial axial loads.

CNC Machinery

Precision Bearings

Non-standard Machinery Parts

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