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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
	NNU4952X2	-	260	360	102	2.1	2.1	990	2200	1800	283	349	2	2	32
	NNU3052	NN3052K	260	400	104	4	4	1020	1930	2200	-	384	3	3	46
	NN3052	NN3052K	260	400	104	4	4	1030	1920	2200	282	376	3	3	47.7
	NNU4052	NNU4052K	260	400	140	4	4	1550	3150	1500	289	384	3	3	63.5
	NN4052	NN4052K	260	400	140	4	4	1550	3150	1500	282	376	3	3	59.7
	NN3152	NN3152K	260	440	144	4	4	1480	2660	1300	282	415	3	3	89.1
	NNU4152	NNU4152K30	260	440	180	4	4	2200	3900	1300	300	424	3	3	110
	NNU4856	NNU4856K	280	350	69	2	2	445	1160	1700	298	340	2	2	15.5
	NN4856	-	280	350	69	1.1	1.1	445	1160	1700	293	336	1	1	15.3
	NN3956	NN3956K	280	380	75	2.1	2.1	695	1460	2200	297	361	2	2	22.7
	NNU4956	NNU4956K	280	380	100	2.1	2.1	765	1800	2200	308	369	2	2	32.5
	NNUP4956	-	280	380	100	2.1	2.1	765	1800	1600	-	369	2	2	33.5
	NN4956	NN4956K	280	380	100	2.1	2.1	765	1800	1600	297	361	2	2	32.9
	NN3056	NN3056K	280	420	106	4	4	1080	2080	2000	-	404	3	3	49.5
	NNU3056	-	280	420	106	4	4	1080	2080	2000	302	395	3	3	51.4
	NNU4056	NNU4056K	280	420	140	4	4	1650	3150	1400	309	404	3	3	66.5
	NN3156	NN3156K	280	460	146	5	5	1520	2790	1200	306	431	4	4	95.7
	NNU4156	NNU4156K30	280	460	180	5	5	2550	4750	1200	318	440	4	4	120
	NNU4860	NNU4860K	300	380	80	2.1	2.1	583	1560	1600	320	369	2	2	22
	NNU4960	NNU4960K	300	420	118	3	3	1020	2360	2000	335	406	2.5	2.5	50
	NN4960	NN4960K	300	420	118	3	3	1020	2360	2000	320	398	2.5	2.5	51.6
	NNU5960X2	-	300	420	150	1.5	1.5	1870	4500	1600	328	412	1.5	1.5	55.5
	NN3060	NN3060K	300	460	118	4	4	1250	2400	1900	-	444	3	3	68.5
	NNU4060	NNU4060K	300	460	160	4	4	1920	4100	1300	333	444	3	3	96
	NN4060	NN4060K	300	460	160	4	4	1920	4100	1300	323	435	3	3	97.6
	NN3160	NN3160K	300	500	160	5	5	1760	3150	1100	327	470	4	4	125
	NNU3160	-	300	500	160	5	5	1760	3150	1100	327	470	4	4	126
	NNU4160	NNU4160K30	300	500	200	5	5	2860	5300	1100	344	480	4	4	155
	NNU4864	NNU4864K	320	400	80	2.1	2.1	765	2080	1500	340	389	2	2	23.5
	NNU4964	NNU4964K	320	440	118	3	3	1060	2500	1400	355	426	2.5	2.5	53
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