Double Row Cylindrical Roller Bearing

The rollers and raceways of double-row cylindrical roller bearings are in line contact, and the number of rollers arranged is large, so the radial rigidity is high and it is also suitable for high-speed operation. Double-row cylindrical roller bearings are available in two types: NN30 (inner ring with ribs) series and NNU49 (outer ring with ribs) series. The inner diameter of the bearing is available in two types: cylindrical bore and tapered bore (K). The tapered bore bearing can easily obtain the specified radial internal clearance by adjusting the amount of push-in of the bearing on the shaft. Bearings with oil holes and oil grooves in the center of the outer diameter of the outer ring can effectively supply lubricating oil to the inside of the bearing. The general lubrication method for bearings without annular grooves and lubricating oil holes is to fill the minimum amount of grease required, or to use accurately measured oil or oil-air lubrication.

Product Details

Bearing model	Dimension			Basic Load Rating		Speed Limit		Radial Stiffness	Quality
	Dimension			Dynamic Load	Static Load	nG Grease	nG Oil	c	Quality
	d	D	B	Cr N	C0r N	min	min	N/μm	m/kg
NN3005-AS-K-M-SP	25	47	16	25.8	30	20900	2500	640	0.12
NN3006-AS-K-M-SP	30	55	19	29000	34000	16000	19000	680	0.19
NN3007-AS-K-M-SP	35	62	20	36000	44000	14000	17000	790	0.25
NN3008-AS-K-M-SP	40	68	21	45000	59000	12000	15000	950	0.3
NN3009-AS-K-M-SP	45	75	23	54000	72000	11000	14000	1080	0.39
NN3010-AS-K-M-SP	50	80	23	57000	80000	10000	13000	1180	0.43
NN3011-AS-K-M-SP	55	90	26	72000	100000	9000	11000	1300	0.63
NN3012-AS-K-M-SP	60	95	26	75000	110000	8500	10000	1410	0.67
NN3013-AS-K-M-SP	65	100	26	77000	116000	8000	9500	1470	0.72
NNU4914-S-K-M-SP	70	100	30	60000	104000	7500	9000	1700	0.73
NN3014-AS-K-M-SP	70	110	30	98000	150000	7000	8500	1660	1.04
NNU4915-S-K-M-SP	75	105	30	63000	114000	7000	8500	1870	0.77
NN3015-AS-K-M-SP	75	115	30	100000	156000	6700	8000	1730	1.09
NNU4916-S-K-M-SP	80	110	30	66000	122000	6700	8000	1980	0.81
NN3016-AS-K-M-SP	80	125	34	120000	186000	6300	7500	1850	1.51
NNU4917-S-K-M-SP	85	120	35	90000	166000	6300	7500	2280	1.2
NN3017-AS-K-M-SP	85	130	34	125000	200000	6000	7000	1990	1.58
NNU4918-S-K-M-SP	90	125	35	93000	176000	6000	7000	2420	1.26
NN3018-AS-K-M-SP	90	140	37	140000	224000	5600	6700	2020	2.05
NNU4919-S-K-M-SP	95	130	35	95000	186000	5600	6700	2560	1.32
NN3019-AS-K-M-SP	95	145	37	143000	236000	5300	6300	2100	2.14
NNU4920-S-K-M-SP	100	140	40	129000	255000	5300	6300	3000	1.86
NN3020-AS-K-M-SP	100	150	37	146000	245000	5300	6300	2170	2.23
NNU4921-S-K-M-SP	105	145	40	129000	260000	5300	6300	3080	1.93
NN3021-AS-K-M-SP	105	160	41	190000	310000	4800	5600	2320	2.84
NNU4922-S-K-M-SP	110	150	40	132000	270000	5000	6000	3170	2.01
NN3022-AS-K-M-SP	110	170	45	220000	360000	4500	5300	2500	3.61
NNU4924-S-K-M-SP	120	165	45	176000	340000	4500	5300	3200	2.71
NN3024-AS-K-M-SP	120	180	46	232000	390000	4300	5000	2700	3.94
NNU4926-S-K-M-SP	130	180	50	190000	390000	4000	4800	3600	3.73
NN3026-AS-K-M-SP	130	200	52	290000	500000	3800	4500	2980	5.79
NNU4928-S-K-M-SP	140	190	50	190000	400000	3800	4500	3700	4.04
NN3028-AS-K-M-SP	140	210	53	300000	520000	3600	4300	3090	6.22
NNU4930-S-K-M-SP	150	210	60	325000	655000	3600	4300	4280	6.1
NN3030-AS-K-M-SP	150	225	56	335000	585000	3400	4000	3300	7.58
NNU4932-S-K-M-SP	160	220	60	335000	680000	3400	4000	4420	6.41
NN3032-AS-K-M-SP	160	240	60	375000	670000	3200	3800	3510	9.23
NNU4934-S-K-M-SP	170	230	60	340000	695000	3200	3800	4560	6.73
NN3034-AS-K-M-SP	170	260	67	450000	800000	3000	3600	3770	12.5
NNU4936-S-K-M-SP	180	250	69	405000	850000	3000	3600	5160	9.96
NN3036-AS-K-M-SP	180	280	74	570000	1000000	2800	3400	4040	16.4
NNU4938-S-K-M-SP	190	260	69	405000	880000	2800	3400	5310	10.4
NN3038-AS-K-M-SP	190	290	75	585000	1040000	2600	3200	4190	17.3
NNU4940-S-K-M-SP	200	280	80	490000	1040000	2600	3200	5510	14.7
NN3040-AS-K-M-SP	200	310	82	655000	1200000	2400	3000	4410	22.2
NNU4944-S-K-M-SP	220	300	80	510000	1140000	2400	3000	6000	15.9
NN3044-AS-K-M-SP	220	340	90	800000	1460000	2200	2800	4770	29.1
NNU4948-S-K-M-SP	240	320	80	530000	1200000	2200	2800	6320	17.1
NN3048-AS-K-M-SP	240	360	92	850000	1560000	2000	2600	5140	31.6
NNU4952-S-K-M-SP	260	360	100	750000	1700000	2000	2600	7080	29.7
NN3052-AS-K-M-SP	260	400	104	1060000	2000000	1900	2400	5680	46.2
NNU4956-S-K-M-SP	280	380	100	765000	1800000	1900	2400	7480	31.6
NN3056-AS-K-M-SP	280	420	106	1080000	2080000	1800	2200	5890	49.7
NNU4960-S-K-M-SP	300	420	118	1040000	2400000	1700	2000	8280	49.1
NN3060-AS-K-M-SP	300	460	118	1270000	2400000	1600	1900	5930	68.8
NNU4964-S-K-M-SP	320	440	118	1060000	2550000	1600	1900	8750	51.8
NN3064-AS-K-M-SP	320	480	121	1320000	2600000	1600	1900	6440	74.2
NNU4968-S-K-M-SP	340	460	118	1100000	2650000	1500	1800	9230	54.5
NN3068-AS-K-M-SP	340	520	133	1630000	3250000	1400	1700	7170	99.3
NNU4972-S-K-M-SP	360	480	118	1140000	2800000	1500	1800	9700	57.3
NN3072-AS-K-M-SP	360	540	134	1660000	3350000	1400	1700	7430	104
NNU4976-S-K-M-SP	380	520	140	1430000	3600000	1400	1700	10970	85.8
NN3076-AS-K-M-SP	380	560	135	1700000	3450000	1300	1600	7690	110
NNU4980-S-K-M-SP	400	540	140	1500000	3800000	1300	1600	11540	89.4
NN3080-AS-K-M-SP	400	600	148	2160000	4500000	1200	1500	8660	143
NNU4984-S-K-M-SP	420	560	140	1530000	4000000	1300	1600	12120	93.2
NN3084-AS-K-M-SP	420	620	150	2120000	4500000	1200	1500	8660	150
NNU4988-S-K-M-SP	440	600	160	2040000	5200000	1200	1500	12690	129
NN3088-AS-K-M-SP	440	650	157	2450000	5100000	1100	1400	9240	172
NNU4992-S-K-M-SP	460	620	160	2120000	5500000	1100	1400	13390	134
NN3092-AS-K-M-SP	460	680	163	2600000	5400000	1100	1400	9430	197
NNU4996-S-K-M-SP	480	650	170	2360000	6100000	1100	1400	14110	158
NN3096-AS-K-M-SP	480	700	165	2700000	5850000	1000	1300	10060	206
NNU49/500-S-K-M-SP	500	670	170	2320000	6100000	1000	1300	14110	162
NN30/500-AS-K-M-SP	500	720	167	2650000	5850000	1000	1300	10060	214

Compared with angular contact ball bearings, double-row cylindrical roller bearings have more advantages in radial stiffness and radial load capacity, and are suitable for lathe spindles with higher stiffness requirements and free-side bearings that bear heavier belt loads. Double-row cylindrical roller bearings can only bear radial loads, and have a larger radial load bearing capacity. In general, double-row cylindrical roller bearings are used when high stiffness is required (mainly lathes). Therefore, this type of bearing is particularly suitable for machine tool spindles that must bear heavy radial loads, high speeds, and have higher stiffness. Bearings with a 1:12 tapered bore (code suffix K) are superior to cylindrical bore bearings because the tapered surface can accurately adjust the clearance and preload during installation. NN30 series bearings can provide a unique balance between load capacity, rigidity and speed, and are therefore generally used as drive-end bearings for machine tool spindles. The inner ring of the NN30 series bearings has three integral ribs, while the outer ring has no ribs. The cross-sectional height of the NNU49 series bearings is very low. This design has higher stiffness than the NN30 series bearings, but slightly lower load capacity. The outer ring of the NN49 series bearing has three integral flanges, while the inner ring has no flanges.

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