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NNU49..-K-M-W33

They are used as non-locating bearings in bearing arrangements of machine tool spindles.Therefo- re,these bearings are normally used in high pre- cision tolerance class,frequently in combination with reduced internal clearance.

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Double row cylindrical roller bearings

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NNU49..-K-M-W33

PRODUCT DETAILS

Technical characteristics

Series NN30 and NNU49 double row cylindrical ro- ller bearings are separable radial bearings.

Their main dimensions are standardized by DIN 5412/part 4.

They are used as non-locating bearings in bearing arrangements of machine tool spindles.Therefo- re,these bearings are normally used in high pre- cision tolerance class,frequently in

combination with reduced internal clearance.

These bearings also feature high radial load ca- pacity and are satisfactory for high speed appli- cations,providing a very stiff and rigid bearing arrangement.They are also commonly used with

tapered bores,namely suffixK(i.e.taper 1:12).

Standard design variants

Double row cylindrical roller bearings of series NN30 and NNU49 are produced and available ei- ther with cylindrical or with tapered bores.

Bearings of series NN30 comprise of a plain outer ring and an inner ring with three integral ribs to guide the two roller rows.

These bearings series are standard produced with a circumferential lubrication groove and lubrica- tion holes,suffix W33.

Bearings of series NNU49 comprise of a plain in- ner ring and an outer ring with three integral ribs to guide the two roller rows.

Non -homology

Double -column cylindrical roller bearings cannot withstand non -homogeneous axis

Tolerance

The NN30 series and the NNU49 series of double -column cylindrical roller bearings are often used as roller bearing.

Therefore, the bearings of these series can also provide stricter tolerance levels, such as P4 or SP, and other tolerance levels should be required.

List the detailed tolerance value of the VE0 dual cylindrical roller bearings and the VEO double -column roller bearings in the axial design in the bearing data/tolerance chapter.

Internal clearance in μm of VEO double row cylindrical roller bearings with cylindrical bore

Clearance group	Bore diameter (mm)
			24	30	40	50	65	80	100	120	140	160	180	200	225
		24	30	40	50	65	80	100	120	140	160	180	200	225	250
C1	min	5	5	5	5	5	10	10	10	10	10	10	15	15	15
C1	max	15	15	15	18	20	25	30	30	35	35	40	45	50	50
C2	min	0	0	5	5	10	10	15	15	15	20	25	35	45	45
C2	max	25	25	30	35	40	45	50	55	60	70	75	90	105	110
CN	min	20	20	25	30	40	40	50	50	60	70	75	90	105	110
CN	max	45	45	50	60	70	75	85	90	105	120	125	145	165	175
C3	min	35	35	45		60	65	75	85	100	115	120	140	160	170
C3	max	60	60	70	80	90	100	110	125	145	165	170	195	220	235
C4	min	50	50	60	70	80	90	105	125	145	165	170	195	220	235
C4	max	75	75	85	100	110	125	140	165	190	215	220	250	280	300
C5	min	75	75	85	100	110	125	140	165	190	215	220	250	280	300
C5	max	100	100	110	130	140	160	175	205	235	265	270	305	340	365

Clearance group	Bore diameter (mm)
	>	250	280	315	355	400	450	500	560	630	710	800	900	1.000	1.120
		280	315	355	400	450	500	560	630	710	800	900	1.000	1.120	1.250
C1	min	20	20	20	25	25	25	25	30	30	35	35	35	50	230
C1	max	55	60	65	75	85	95	100	110	130	140	160	180	200	470
C2	min	55	55	65	100	110	110	120	140	145	150	180	200	220	230
C2	max	125	130	145	190	210	220	240	260	285	310	350	390	430	470
CN	min	125	130	145	190	210	220	240	260	285	310	350	390	430	470
CN	max	195	205	225	280	310	330	360	380	425	470	520	580	640	710
C3	min	190	200	225	280	310	330	360	380	425	470	520	580	640	710
C3	max	260	275	305	370	410	440	480	500	565	630	690	770	850	950
C4	min	260	275	305	370	410	440	480	500	565	630	690	770	850	950
C4	max	330	350	385	460	510	550	600	620	705	790	860	960	1.060	1.190
C5	min	330	350	385	460	510	550	600	620	705	790	860	960	1.060	1.510
C5	max	400	425	465	550	610	660	720	740	845	950	1.030	1.150	1.270	1.750

Internal clearance in μm of VEO double row cylindrical roller bearings with tapered bore

Clearance group	Bore diameter(mm)
			24	30	40	50	65	80	100	120	140	160	180	200	225
	≤	24	30	40	50	65	80	100	120	140	160	180	200	225	250
C1	min	10	15	15	17	20	25	35	40	45	50	55	60	60	65
C1	max	20	25	25	30	35	40	55	60	70	75	85	90	95	100
C2	min	15	20	20	25	30	35	40	50	55	60	75	85	95	105
C2	max	40	45	45	55	60	70	75	90	100	110	125	140	155	170
CN	min	30	35	40	45	50	60	70	90	100	110	125	140	155	170
CN	max	55	60	65	75	80	95	105	130	145	160	175	195	215	235
C3	min	40	45	55	60	70	85	95	115	130	145	160	180	200	220
C3	max	65	70	80	90	100	120	130	155	175	195	210	235	260	285
C4	min	50	55	70	75	90	110	120	140	160	180	195	220	245	270
C4	max	75	80	95	105	120	145	155	180	205	230	245	275	305	335
C5	min	75	80	95	105	120	145	155	180	205	230	245	275	305	335
C5	max	100	105	120	135	150	180	190	220	250	280	295	330	365	400

Clearance group	Bore diameter (mm)
		250	280	315	355	400	450	500	560	630	710	800	900	1.000	1.120
	≤	280	315	355	400	450	500	560	630	710	800	900	1.000	1.120	1.250
C1	min	75	80	90	100	110	120	130	140	160	170	190	210	230
C1	max	110	120	135	150	170	190	210	230	260	290	330	360	400
C2	min	115	130	145	165	185	205	230	260	295	325	370	410	455	490
C2	max	185	205	225	255	285	315	350	380	435	485	540	600	665	730
CN	min	185	205	225	255	285	315	350	380	435	485	540	600	665	730
CN	max	255	280	305	345	385	425	470	500	575	645	710	790	875	970
C3	min	240	265	290	330	370	410	455	500	565	630	700	780	865	960
C3	max	310	340	370	420	470	520	575	620	705	790	870	970	1075	1.200
C4	min	295	325	355	405	455	505	560	620	695	775	860	960	1065	1.200
C4	max	365	400	435	495	555	615	680	740	835	935	1.030	1.150	1.275	1.440
C5	min	365	400	435	495	555	615	680	740	835	935	1.030	1.150	1.275
C5	max	435	475	515	585	655	725	800	860	975	1.095	1.200	1.340	1.485

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Double row cylindrical roller bearings