Description

Product Introduction

The NNU Series is a premium line of double row non-locating cylindrical roller bearings designed for high-precision and heavy-duty applications. Featuring a separable design with two rows of cylindrical rollers, these bearings deliver exceptional radial load capacity, high rigidity, and outstanding rotational accuracy.

Manufactured from high-quality high carbon chromium steel (GCr15), NNU bearings are engineered to meet the demanding requirements of modern industrial equipment. The non-locating structure allows free axial displacement, effectively compensating for thermal expansion and mounting errors, making them ideal for high-speed and high-precision spindle applications.

Key Features:

Double row cylindrical rollers for superior load distribution and rigidity
High precision grades (P4, P5 available)
Non-locating design (inner ring without flanges)
Low friction and excellent high-speed performance
Separable structure for easy mounting and maintenance
Available with tapered bore (K type) for interference fit
Multiple sizes from small to large bore diameters

Product Application

Machine Tool Spindles - CNC lathes, machining centers, grinding machines
Rolling Mills - Steel and metallurgical industry
Heavy Industrial Machinery - Gearboxes, calenders, and large gearboxes
Wind Turbine Main Shafts
Mining & Construction Equipment
Papermaking Machinery
High-Speed Electric Motors
Precision Rotary Tables

NNU Series bearings are the preferred choice when high radial stiffness, precision, and reliability under heavy loads are required. Whether for high-speed precision machining or heavy-duty continuous operation, these bearings provide long service life and consistent performance.

Product Parameter

Model	d	D	B	rs max	Cr	C0r	Grease Limit Speed	Oil Limit Speed
NNC4810V	50	80	30	1	130	190	5000	6300
NNC4811V	55	90	35	1.5	180	270	4500	5600
NNC4812V	60	95	35	1.5	190	290	4300	5300
NNC4813V	65	100	35	1.5	200	310	4000	5000
NNC4814V	70	110	40	1.5	240	370	3800	4800
NNC4815V	75	115	40	1.5	250	390	3600	4500
NNC4816V	80	125	45	2	290	450	3400	4300
NNC4817V	85	130	45	2	300	470	3200	4000
NNC4818V	90	140	50	2	340	530	3000	3800
NNC4819V	95	145	50	2	350	550	2800	3600
NNC4820V	100	150	50	2	360	570	2600	3400
NNC4822V	110	170	60	2.5	420	680	2400	3200
NNC4824V	120	180	60	2.5	430	700	2200	3000
NNC4826V	130	200	70	2.5	530	900	2100	2900
NNC4828V	140	210	70	2.5	540	920	2000	2800
NNC4830V	150	225	80	3	640	1100	1900	2700
NNC4832V	160	240	80	3	660	1150	1800	2600
NNC4834V	170	260	90	3	760	1350	1700	2500
NNC4836V	180	280	100	3	860	1550	1600	2400
NNC4838V	190	290	100	3	890	1600	1500	2300
NNC4840V	200	310	110	3.5	990	1750	1400	2200
NNC4910V	50	80	40	1	135	191	5000	6300
NNC4911V	55	90	46	1.5	184	275	4500	5600
NNC4912V	60	95	46	1.5	194	295	4300	5300
NNC4913V	65	100	46	1.5	204	315	4000	5000
NNC4914V	70	110	50	1.5	245	375	3800	4800
NNC4915V	75	115	50	1.5	255	395	3600	4500
NNC4916V	80	125	55	2	295	455	3400	4300
NNC4917V	85	130	55	2	305	475	3200	4000
NNC4918V	90	140	60	2	345	535	3000	3800
NNC4919V	95	145	60	2	355	555	2800	3600
NNC4920V	100	150	60	2	365	575	2600	3400
NNC4921V	105	160	65	2	420	680	2400	3200
NNC4922V	110	170	65	2.5	430	700	2200	3000
NNC4924V	120	180	70	2.5	490	820	2000	2800
NNC4926V	130	200	80	2.5	590	1000	1900	2600
NNC4928V	140	210	80	2.5	600	1020	1800	2500
NNC4930V	150	225	90	3	700	1200	1700	2400
NNC4932V	160	240	90	3	720	1250	1600	2300
NNC4934V	170	260	100	3	820	1450	1500	2200
NNC4936V	180	280	110	3	920	1650	1400	2100
NNC4938V	190	290	110	3	950	1700	1300	2000
NNC4940V	200	310	120	3.5	1050	1900	1200	1900