NN4921 Cylindrical Roller Bearings for CNC Lathe Machine Tool Equipment

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NN4921 Cylindrical Roller Bearings for CNC Lathe Machine Tool Equipment
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Features
Specifications
Material: GCr15 Or GCr15SiMn
Accuracy: P5,SP,P4,UP
Row: Single Or Double
Quality System: ISO9001-2008
Service: OEM Customized Services
Sample: Available
Types: Open Or Sealed
Function: Mechanical Engineering
Basic Infomation
Place of Origin: LUOYANG
Brand Name: MONTON
Certification: ISO9001
Model Number: NN4921
Payment & Shipping Terms
Packaging Details: Single box/Wooden case
Delivery Time: 7-35 days
Payment Terms: TT
Supply Ability: 1000/pcs/week
Product Description

Cylindrical roller bearing

 

 

 

Cylinderical rolling element NN4921 bearings by size
Dimension 105*145*40mm
Weight 2.00KG
Material Bearing steel GCr15/ Chrome steel, etc
Tolerance Grades P0(ABEC-1),P6(ABEC-3),P5(ABEC-5)
Quality Standard ISO9001-2008
Retainer Materical E/M/L/Q
Noise Grades EMQ V1 Z2 EMQ V2 Z3 EMQ V3 Z4
Application Auto,truck,mining machine, construction maching&general machine

 

 

What is a Cylindrical Roller Bearings?

Cylindrical roller bearings are of high load capacity and can operate at high speeds because they use rollers as their rolling elements. They can therefore be used in applications involving heavy radial and impact loading.

The rollers are cylindrical in shape and crowned at the end in order to reduce the stress concentrations. They are also suitable for applications that require high speed because the rollers are guided by ribs which are either on the outer or inner ring.

More information

With the absence of ribs, either the inner or outer ring will move freely so as to adjust to axial movement hence can be used as free side bearings. This enables them to absorb shaft expansion to a certain extent, relative to the housing position.

NU and NJ type cylindrical roller bearings produce high performance results when used as free side bearings because they possess the required characteristics for that purpose. NF type cylindrical roller bearing also supports the displacement of the axial to a certain extent in both directions and therefore can be used as a free side bearing.

In applications where heavy axial loads have to be supported, cylindrical roller thrust bearings are the most suitable. This is because they are designed to contain shock loads, are stiff and the axial space required is little. They only support axial loads that are acting in a single direction.

Detailed applications

Specifically, our cylindrical roller bearings can be used in industrial transmission, automotive, electric motor, generator sets, elevating machinery, machine tool spindles as well as internal-combustion engines, etc.

Advantages

These roller bearings can be separated and are easy to mount as well as dismount.

N Series- Bearings of N design are single row cylindrical roller bearing and have two fixed ribs on the inner ring that retain the rollers and cage and one smooth outer ring. This design allows an axial displacement in certain limits, of the shaft in relation to the housing. Therefore, N Series rolling bearings are used in non-locating bearing units. Also, the N Series bearings have virtually no thrust capacity.

 

NU Series- Are single row cylindrical roller bearings and have two fixed ribs on the outer ring and one smooth inner ring. This design allows an axial displacement in certain limits, of the shaft in relation to the housing. Therefore, NU Series rolling bearings are used in non-locating bearing units. Also, the NU Series bearings have no virtually thrust capacity.

 

NN Series- Bearings of NN design are double row cylindrical roller bearing and have three fixed ribs on the inner ring that retain the rollers and cage and one smooth outer ring. This design allows an axial displacement in certain limits, of the shaft in relation to the housing. Therefore, N Series rolling bearings are used in non-locating bearing units. Also, the NN Series bearings have no virtually thrust capacity.

 

NNU Series- Are double row cylindrical roller bearings and have three fixed ribs on the outer ring and one smooth inner ring. This design allows an axial displacement in certain limits, of the shaft in relation to the housing. Therefore, NU Series rolling bearings are used in non-locating bearing units. Also, the NNU Series bearings have no virtually thrust capacity.

 

single row cylindrical roller bearings :N NU NJ NF NUP NFP NH(NJ+HJ)

double row cylindrical roller bearings :NN NNU NNF

four row cylindrical roller bearings :FC FCD

full complement cylindrical roller bearings

 

Application
widely used in automobile, electrical equipment, instrument, building machinery, rolling stock agricultural machinery and various specialized machineries,machine spindle application and are used for cool and hot mills.

Technology

N/NU/NJ N211 cylinderical roller mill bearing manufacturer in China

Number       d(mm) D(mm) B(mm) Weight(kg)
N202E NJ202E NU202E   15 35 11 0.049
N203E NJ203E NU203E NUP203E 17 40 12 0.068
  NJ2203E NU2203E NUP204E 17 40 16 0.055
  NJ303E NU303E NUP303E 17 47 14 0.127
N204E NJ204E NU204E NUP204E 20 47 14 0.119
  NJ2204E NU2204E NUP2204E 20 47 18 0.154
  NJ304E NU304E NUP304E 20 52 15 0.16
  NJ2304E NU2304E NUP2304E 20 52 21 0.224
N205E NJ205E NU205E NUP205E 25 52 15 0.145
N206E NJ206E NU206E NUP206E 30 62 16 0.219
N207E NJ207E NU207E NUP207E 35 72 17 0.317
N208E NJ208E NU208E NUP208E 40 80 15 0.399
N209E NJ209E NU209E NUP209E 45 85 19 0.457
N210E NJ210E NU210E NUP210E 50 90 20 0.517
N211E NJ211E NU211E NUP211E 55 100 21 0.693
N212E NJ212E NU212E NUP212E 60 110 22 0.909
  NJ2213E NU2213E NUP2213E 65 120 31 1.54
N314E NJ314E NU314E NUP314E 70 150 35 2.89
  NJ2315E NU2315E NUP2315E 75 160 55 5.14
N216E NJ216E NU216E NUP216E 80 140 26 1.62
N317E NJ317E NU317E NUP317E 85 180 41 4.8
  NJ2218E NU2218E NUP2218E 90 160 40 3.29
N219E NJ219E NU219E NUP219E 95 170 32 2.99
  NJ2220E NU2220E NUP2220E 100 180 46 4.92
N322E NJ322E NU322E NUP322E 110 240 50 10.7
N224E NJ224E NU224E NUP224E 120 215 40 6.02
  NJ2324E NU2324E NUP2324E 120 260 86 23.8
N228E NJ228E NU228E NUP228E 140 250 42

16.8

 

 

Boundary Mass (KG) Bearing Numbers Basic Limited Speed
Dimenssion (mm) Load Ratings(KN) (rpm)
d D B approx Type Cr Cor Grease Oil
15 35 11 0.05 N202 12.7 10.4 20000 22000
  35 11 0.05 NJ202 12.7 10.4 20000 22000
  35 11 0.05 NU202 12.7 10.4 20000 22000
17 40 12 0.06 N203 17.6 14.6 10000 18000
  40 12 0.06 NJ203 14.5 12.8 18000 18000
20 47 14 0.109 N204 16.6 13.9 17000 20000
  47 14 0.111 NJ204 16.6 13.9 17000 20000
  47 14 0.111 NU204 16.6 13.9 17000 20000
  52 15 0.149 N304 23.1 19.2 14000 17000
  52 15 0.153 NJ304 23.1 19.2 14000 17000
  52 15 0.153 NU304 23.1 19.2 14000 17000
25 52 15 0.134 N205 18.8 17 14000 16000
  52 15 0.137 NJ205 18.8 17 14000 17000
  52 18 0.17 NJ2205V 35.3 29.4 12000 25000
  52 15 0.137 NU205 18.8 17 14000 16000
  62 17 0.235 N305 31.5 27.7 12000 14000
  62 17 0.241 NJ305 31.5 27.7 12000 14000
  62 17 0.241 NU305 31.5 27.7 12000 14000
  62 24 0.37 NJ2305V 67 72.7 7200 10000
30 62 16 0.203 N206 24.9 23.3 12000 14000
  62 16 0.207 NJ206 24.9 23.3 12000 14000
  62 16 0.207 NU206 24.9 23.3 12000 14000
  72 19 0.35 N306 38.5 35 10000 12000
  72 19 0.358 NJ306 38.5 35 10000 12000
  72 19 0.358 NU306 38.5 35 10000 12000
35 72 17 0.289 N207 35.5 34 11000 12000
  72 17 0.295 NJ207 35.5 34 11000 12000
  72 17 0.295 NU207 35.5 34 11000 12000
  80 21 0.451 N307 49.5 47 9000 11000
  80 21 0.461 NJ307 49.5 47 9000 11000
  80 21 0.461 NU307 49.5 47 9000 11000
  80 21 0.536 NUP307V 77.2 78.6 10000 23000
40 80 18 0.37 N208 43.5 43 9400 11000
  80 18 0.387 NJ208 43.5 43 9400 11000
  80 18 0.378 NU208 43.5 43 9400 11000
 

 

 

 
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