Double-row cylindrical roller bearings

QY949

Double-row cylindrical roller bearings are available in two structures: cylindrical inner bore and conical inner bore (indicated by the suffix code K). This type of bearing features a compact structure, high rigidity, large load-carrying capacity, and minimal deformation under load. It is particularly suitable for supporting machine tool spindles. The conical inner bore can also be used for fine adjustment of the clearance and simplifies the structure of the positioning device, making installation and disassembly more convenient.

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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.

Bearing Number		Principal Dimensions (mm)			Basic Load Ratings
		ID	OU	H	Cr	C0r
		d[mm]	D[mm]	H[mm]	Cr[kN]	Cor[kN]
NNU4940	NNU4940K	200	280	80	570	1220
NN3040	NN3040K	200	310	82	655	1170
NNU4944	NNU4944K	220	300	80	600	1330
NN3044	NN3044K	220	340	90	815	1480
NNU4948	NNU4948K	240	320	80	625	1450
NN3048	NN3048K	240	360	92	855	1600
NNU4952	NNU4952K	260	360	100	935	2100
NN3052	NN3052K	260	400	104	103	1920
NNU4956	NNU4956K	280	380	100	960	2230
NN3056	NN3056K	280	420	106	1080	2080
NNU4960	NNU4960K	300	420	118	1230	3870
NN3060	NN3060K	300	460	118	1290	2460
NNU4964/W33		320	440	118	1090	3040
NN3064/W33		320	480	121	1360	2910
NN3068/W33		340	520	133	1730	3780
NN3072/W33		360	540	134	1940	3900
NN3076/W33		380	560	135	1800	4100
NN3080		400	600	148	2360	4750
NNU4980/W33		400	540	140	1700	4500
NNU4984/W33		420	560	140	1650	4750
NNU4084/W33		420	620	200	3450	7500
NN3084/W33		420	620	150	2100	4500
NNU4088/W33		440	650	212	3850	8250
NN3092/W33		460	680	163	2600	6200
NNU4996/W33		480	650	170	2300	6150
NN3096/W33		480	700	165	2500	5800
NN30/500/W33		500	720	167	2650	5800
NNU49/530/W33		530	710	180	2930	7450
NN30/530/W33		530	780	185	3250	7250
NNU49/560/W33		560	750	190	3210	8950
NN30/560		560	820	195	3720	8170
NN30/560/W33		560	820	195	3720	8150
NNU49/600/W33		600	800	200	3700	11400
NN30/600		600	870	200	4460	9850
NN30/630		630	920	212	4350	10600
NNU49/670		670	900	230	4900	12500
NNU30/670		670	980	230	4980	11300
NN30/710W33		710	130	236	5500	12500
NNU49/750		750	1000	250	5400	15800
NN30/750/W33		750	1090	250	6800	15000
NNU49/800/W33		800	1060	258	5800	16500
NN30/800/W33		800	1150	258	7500	17500
NNU49/850/W33		850	1120	272	5650	17500
NN30/850/W33		850	1220	272	7800	18000
NNU49/900/W33		900	1180	280	6300	19000
NN30/900/W33		900	1280	280	7920	19000
NNU49/950/W33		950	1250	300	7050	22300

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