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Double Row Cylindrical Roller Bearing

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Product Information

Double-row cylindrical roller bearings are an enhanced evolution of single-row cylindrical roller bearings. They integrate two rows of precisely arranged rollers and an integral cage within a more compact bearing width, resulting in a leap in performance and making them the top choice for high-end, heavy-duty precision applications.

Main Application Areas：

Double-row cylindrical roller bearings are the "crown jewel" of ultra-precision, ultra-heavy-duty, and high-rigidity applications:

Top-tier machine tool spindles: Spindles for high-end CNC lathes, machining centers, grinding machines, and boring machines. Their high rigidity, high precision, and high-speed capability are the cornerstone of ensuring machined surface quality and shape accuracy.

Precision rolls: Support rolls for high-precision strip mills, ensuring uniform sheet thickness.

Large precision machinery: Vertical lathe worktables, radial support sections of slewing bearings, and rotary tables for large precision measuring instruments.

High-speed electric spindles and internal grinding spindles: Direct drive applications with extreme requirements for rigidity and precision.

Wind turbine spindles: Used in some designs to withstand enormous radial loads.

Inquiry	Bearing NO.		Boundary dimensions(mm)					Basic load ratings(kN)		Limiting speed(rpm)	Abutment and fillet dimensions(mm)				Weight (kg)
Inquiry	Cylindrical bore	Tapered bore	d	D	B/C	r 1.2min	r3.4min	Cr	Cor	Speed Ratings	da max	Da max	ra max	rb max	Refer
	NN3920	NN3920K	100	140	30	1.1	1.1	106	182	6300	109	131	1	1	1.32
	NNU4920	NNU4920K	100	140	40	1.1	1.1	128	255	6300	111	133.5	1	1	1.9
	NN4920	NN4920K	100	140	40	1.1	1.1	128	255	6300	109	131	1	1	1.76
	NNUB4920-70	-	100	140	70/40	1.1	1.1	128	255	4800	111	133.5	1	1	2.5
	NNUB4920-80	-	100	140	80/40	1.1	1.1	128	255	4800	111	133.5	1	1	2.65
	NN3020	NN3020K	100	150	37	1.5	1.5	151	250	6000	111	142	1.5	1.5	2.2
	NN3120	-	100	165	52	1.1	1.1	234	360	3600	109	155	1	1	4.38
	NNU3120	-	100	165	52	2	2	234	360	3600	112	152	2	2	4.39
	NNU4120	NNU4120K30	100	165	65	2	2	358	570	3600	114	155	2	2	5.5
	NNU4921	NNU4921K	105	145	40	1.1	1.1	130	260	6000	116	138.5	1	1	2
	NN4921	-	105	145	40	1.1	1.1	130	260	6000	114	136	1	1	2
	NNU3021	NNU3021K	105	160	41	2	2	190	305	5600	-	150	2	2	2.8
	NN3021	NN3021K	105	160	41	2	2	190	305	5600	117	147	2	2	2.88
	NNU4121	NNU4121K30	105	175	69	2	2	413	670	3400	120	165	2	2	6.7
	NN3922	NN3922K	110	150	30	1.1	1.1	114	207	6000	119	141	1	1	1.41
	NNU4922	NNU4922K	110	150	40	1.1	1.1	132	270	6000	121	143.5	1	1	2.05
	NN4922	NN4922K	110	150	40	1.1	1.1	132	270	6000	119	141	1	1	2.1
	NNUB4922	-	110	150	55/40	1.1	1.1	132	270	4500	121	143.5	1	1	2.4
	NN3022	NN3022K	110	170	45	2	2	220	360	5300	-	160	2	2	3.55
	NNU3022	-	110	170	45	2	2	220	360	5300	122	157	2	2	3.74
	NN3122	-	110	180	56	1.1	1.1	290	450	3200	119	170	1	1	5.4
	NNU4122	NNU4122K30	110	180	69	2	2	418	710	3200	125	170	2	2	6.95
	NN3924	NN3924K	120	165	34	1.1	1.1	138	251	5300	130	155	1	1	2.02
	NNU4924	NNU4924K	120	165	45	1.1	1.1	176	340	5300	133	158.5	1	1	2.8
	NN4924	NN4924K	120	165	45	1.1	1.1	176	340	5300	130	155	1	1	2.87
	NN3024	NN3024K	120	180	46	2	2	229	390	5000	-	170	2	2	3.85
	NNU3024	-	120	180	46	2	2	229	390	5000	132	167	2	2	4.07
	NN3124	NN3124K	120	200	62	2	2	355	550	3000	132	167	2	2	7.72
	NNU4124	NNU4124K30	120	200	80	2	2	523	865	3000	137	190	2	2	11
	NNUB4224X2-130	-	120	215	130/100	2×60°	1.1	704	1120	2200	137	209.5	1	1	15.5
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