NU2xx & NU3xx Series

NU Series are non-locating, single row Cylindrical Roller Bearings with cage. The inner ring is separable and without flanges on their side of the roller which slides in both directions and is commonly found in motors.

Classification :

Cylindrical Roller Bearings

Keywords :

NU2xx series cylindrical roller bearings, NU3xx series cylindrical roller bearings, NU200 series, NU300 series, non-locating radial bearings, separable cylindrical roller bearings, motor bearings, gearbox bearings, high speed industrial bearings

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🎯 Category Overview

NU2xx and NU3xx series are single-row cylindrical roller bearings characterized by double flanges on the outer ring and no flanges on the inner ring. This design allows free axial displacement of the shaft relative to the housing, making them ideal non-locating bearings to compensate for thermal expansion. They feature high radial load capacity, excellent high-speed performance, and easy installation, widely used in motors, gearboxes, machine tools and industrial rotating equipment.

📏 Complete Model & Dimension List (Side-by-Side)

NU2xx Series	d (mm)	D (mm)	B (mm)	NU3xx Series	d (mm)	D (mm)	B (mm)
NU205	25	52	15	NU305	25	62	17
NU206	30	62	16	NU306	30	72	19
NU207	35	72	17	NU307	35	80	21
NU208	40	80	18	NU308	40	90	23
NU209	45	85	19	NU309	45	100	25
NU210	50	90	20	NU310	50	110	27
NU211	55	100	21	NU311	55	120	29
NU212	60	110	22	NU312	60	130	31
NU213	65	120	23	NU313	65	140	33
NU214	70	125	24	NU314	70	150	35
NU215	75	130	25	NU315	75	160	37
NU216	80	140	26	NU316	80	170	39
NU217	85	150	28	NU317	85	180	41
NU218	90	160	30	NU318	90	190	43
NU219	95	170	32	NU319	95	200	45
NU220	100	180	34	NU320	100	215	47
NU221	105	190	36	NU321	105	225	49
NU222	110	200	38	NU322	110	240	50
NU224	120	215	40	NU324	120	260	55
NU226	130	230	40	NU326	130	280	58

⚙️ Core Advantages

Non-locating design: Permits free axial displacement to compensate for shaft thermal expansion, reducing system stress
High radial load capacity: Optimized roller geometry delivers superior rigidity and load resistance
Separable structure: Inner and outer rings can be mounted separately, simplifying installation and maintenance
Excellent high-speed performance: Low friction design ensures stable operation at high rotational speeds
Global interchangeability: Standard dimensions match international brand equivalents for direct replacement
Versatile series options: NU2xx for medium load, NU3xx for heavy load applications

🛠️ Typical Applications

Widely used in electric motors, gearboxes, reducers, pumps, fans, machine tool spindles, compressors, textile machinery, printing equipment and various industrial rotating machinery requiring non-locating radial support.

Category Overview

Cylindrical Roller Bearings are radial rolling bearings with cylindrical rolling elements that make line contact with raceways. They feature high radial load capacity, high rigidity, high-speed capability, and low friction.Most types can accommodate axial displacement between shaft and housing, and some structures allow carrying axial loads. They are widely used in motors, gearboxes, pumps, compressors, machine tools and other heavy‑duty rotating equipment.

Our Series Breakdown

We offer a complete range of cylindrical roller bearing series to suit different positioning and load requirements:

Series	Features	Typical Applications
NU Series	Floating bearing, free axial displacement, high radial load	Motors, fans, general machinery
NJ Series	Locates shaft in one axial direction, high rigidity	Gearboxes, reducers, machine tool spindles
NUP Series	Locates shaft in both axial directions, fixed positioning	Heavy gearboxes, compressors, pumps
N Series	Outer ring with two ribs, inner ring without ribs	General industrial transmission equipment
NF Series	Single-direction axial location, compact structure	Small‑to‑medium gearboxes and motors
RN Series	Without outer ring, fits directly into housing bore	Hydraulic pumps, construction machinery
RNU Series	Without inner ring, fits directly onto shaft	Special transmission mechanisms, compact equipment

Core Advantages

Extremely high radial load capacity and strong impact resistance
High rigidity and excellent high-speed performance
Low friction, stable operation, long service life
Allow axial thermal expansion of shaft (floating types)
Separable structure for easy installation and maintenance
Available in open, sealed and precision grades

🛠️ Typical Applications

Widely used in electric motors, gearboxes, reducers, pumps, compressors, machine tool spindles, fans, rolling mills, automotive transmissions, and other heavy‑duty industrial machinery.

PRODUCT TESTING

Bearing Forging

Bearing Annealing

Turning Process

Quenching

Bearing Assembly

Bearing Clearance Testing

Grease injection

Bearing Marking

Cylindrical Roller Bearings