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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]
NJ222EM	110	200	38	293	365
NJ221EM	105	190	36	262	310
NJ220EM	100	180	34	249	305
NJ219EM	95	170	32	220	265
NJ218EM	90	160	30	182	217
NJ217EM	85	150	28	167	199
NJ216EM	80	140	26	139	167
NJ215EM	75	130	25	130	156
NJ214EM	70	125	24	119	137
NJ213EM	65	120	23	102	118
NJ212EM	60	110	22	90	102
NJ211EM	55	100	21	80	96

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]
NJ222EM
NJ221EM
NJ220EM
NJ219EM
NJ218EM
NJ217EM
NJ216EM
NJ215EM
NJ214EM
NJ213EM
NJ212EM
NJ211EM

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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