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Cylindrical Roller Bearing

The cylindrical roller and raceway are line contact bearings. They have large load capacity and mainly bear radial loads. The friction between the rolling element and the rib of the ferrule is small, which is suitable for high-speed rotation. According to whether the ferrule has ribs or not, they can be divided into single-row cylindrical roller bearings such as NU, NJ, NUP, N, NF, and double-row cylindrical roller bearings such as NNU and NN. The inner and outer rings of this bearing are separable.

Design and variation

Product details

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Model number	Basic size			Basic load rating		Rated speed
				Dynamic state	Static	Reference speed	Limiting speed
	d [mm]	D [mm]	B [mm]	C [kN]	C₀ [kN]	[r/min]	[r/min]
NJ210EM	50	90	20	61	69
NJ209EM	45	85	19	59	64
NJ208EM	40	80	18	52	53
NJ207EM	35	72	17	47	48
NJ206EM	30	62	16	36	36
NJ205EM	25	52	15	28	27
NJ204EM	20	47	14	17	14
NJ 203 EM	17	40	20	18	15

Model number	Basic size			Basic load rating		Rated speed
				Dynamic state	Static	Reference speed	Limiting speed
	d [in]	D [in]	B [in]	C [Ibf]	C₀ [Ibf]	[r/min]	[r/min]
NJ210EM
NJ209EM
NJ208EM
NJ207EM
NJ206EM
NJ205EM
NJ204EM
NJ 203 EM

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Product type, design and form

Full Complement Cylindrical Roller Bearings

Divided into single-row and double-row designs, including NCF, NJG, NNC, NNCF, NNCL and NNF. These bearings are suitable for medium and low speeds and places with heavy loads.

Four-row cylindrical roller bearings

Typically used for rollers that require high speed and high precision, such as wire mills, profile mills, and hot and cold sheet mills. These bearings are particularly suitable for high load and high precision applications.

Double row cylindrical roller bearings

Double row cylindrical roller bearings include NNU and NN types. NNU type has no ribs on the outer ring and double ribs on the inner ring, while NN type has the opposite.

Single row cylindrical roller bearings

Single row cylindrical roller bearings include NU, NJ, NUP, N and NF types. The main difference between these bearings lies in the structure of the ribs.

Advantages

1. High load-bearing capacity: Cylindrical roller bearings adopt roller structure, which can bear high radial and axial loads and are suitable for high-load rotating

bodies.

2. Low friction coefficient: Since cylindrical roller bearings have a large rolling contact area and a low friction coefficient, they have good lubrication performance

and low friction resistance, which can effectively reduce mechanical energy consumption and wear.

3. High rotation accuracy: Cylindrical roller bearings adopt precision processing technology and have high rotation accuracy, which can ensure the stability and

accuracy of mechanical equipment.

4. Good durability: Cylindrical roller bearings adopt high-quality materials and advanced heat treatment technology, with good durability and long service life.

5. Good adaptability: Cylindrical roller bearings can choose different designs, materials and sizes according to different application requirements, and have strong

adaptability and flexibility.

6. Low maintenance cost: Cylindrical roller bearings have low maintenance costs, and only need regular lubrication and inspection to ensure their normal operation.

Applications

‌1. Large electric motors‌: Cylindrical roller bearings can withstand large radial loads and certain axial loads, and are suitable for occasions that require

high loads and high-speed operation.

‌2. Machine tool spindles‌: Due to their excellent radial load capacity and high-speed rotation characteristics, cylindrical roller bearings are often used

in machine tool spindles to ensure the stability and precision of the spindles.

‌3. Automotive industry‌: In the automotive industry, cylindrical roller bearings are used in various transmission parts, such as axle boxes, diesel engine

crankshafts, etc., and can withstand heavy loads and impact loads.

‌4. Metallurgical equipment‌: In metallurgical equipment, such as cranes and rolling mills, cylindrical roller bearings can withstand huge radial loads and

axial impact loads, ensuring the stable operation of the equipment.

‌5‌. Other mechanical equipment‌: Widely used in mechanical equipment such as vibrating screens, reducers, generators, gas turbines, etc., to adapt to

various high-load and high-speed application scenarios