Double row cylindrical roller bearing:
NN bearing has no rib on outer ring, but has ribs on both sides of inner ring and also a center rib in the middle of the inner ring.
NNU bearing has ribs on both sides of the outer ring and also a center rib in the middle of the outer ring, but no ribs on the inner ring.
NNF bearing is a full complement cylindrical roller bearing. It is consist of a outer ring with a center rib and a inner ring with two ribs on both sides. It has both sides of contact seal type.
This type of bearings is separable.As their rollers linearly come into contact with inner ring and outer ring with less coefficient, these bearings have very good capacity of radial load,suitable for electric motors,automobiles,transmission shafts,gear shafts and so on. Double row cylindrical roller bearings are good at the spindles of spindles of machine tools.
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Double Row Cylindrical Roller Bearing
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Bearing Designation
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Boundary Dimensions
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Mass
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d
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D
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B
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mm
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kg
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NNU4121M/W33
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105
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175
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69
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6.7
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NNU4122M/W33
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110
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180
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69
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6.95
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NNU4124M/W33
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120
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200
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80
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11
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NNU4126M/W33
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130
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210
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80
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10.7
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NNU4128M/W33
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140
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225
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85
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13
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NNU4130M/W33
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150
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250
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100
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18
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NNU4132M/W33
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160
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270
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109
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25
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NNU4134M/W33
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170
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280
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109
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26
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NNU4136M/W33
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180
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300
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118
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32.5
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NNU4138M/W33
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190
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320
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128
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41
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NNU4840M/W33
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200
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250
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50
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5.75
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NNU4140M/W33
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200
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340
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140
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51
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NNU4144M/W33
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220
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370
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150
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65
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NNU4848M/W33
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240
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300
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60
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9.9
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NNU4148M/W33
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240
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400
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160
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85
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NNU4052M/W33
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260
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400
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140
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63.5
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NNU4152M/W33
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260
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440
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180
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110
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NNU4856M/W33
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280
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350
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69
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15.5
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NNU4056M/W33
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280
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420
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140
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66.5
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NNU4156M/W33
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280
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460
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180
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120
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NNU4860M/W33
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300
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380
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80
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22
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NNU4060M/W33
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300
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460
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160
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96
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NNU4160M/W33
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300
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500
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200
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155
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NNU4864M/W33
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320
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400
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80
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23.5
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NNU4064M/W33
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320
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480
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160
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100
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NNU4164M/W33
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320
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540
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218
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200
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NNU4868M/W33
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340
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420
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80
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25
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NNU4068M/W33
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340
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520
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180
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140
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NNU4168M/W33
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340
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580
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243
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260
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NNU4072M/W33
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360
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540
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180
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142
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NNU4172M/W33
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360
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600
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243
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275
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NNU4876M/W33
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380
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480
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100
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44
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NNU4076M/W33
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380
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560
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180
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150
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NNU4176M/W33
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380
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620
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243
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285
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NNU4880M/W33
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400
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500
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100
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46
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NNU4080M/W33
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400
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600
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200
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205
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NNU4180M/W33
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400
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650
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250
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325
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NNU4884M/W33
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420
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520
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100
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48
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NNU4084M/W33
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420
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620
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200
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183
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NNU4184M/W33
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420
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700
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280
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440
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NNU4888M/W33
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440
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540
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100
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50
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NNU4088M/W33
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440
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650
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212
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215
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NNU4188M/W33
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440
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720
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280
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450
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NNU4892M/W33
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460
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580
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118
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75
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NNU4092M/W33
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460
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680
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218
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240
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NNU4192M/W33
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460
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760
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300
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535
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NNU4096M/W33
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480
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700
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218
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275
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NNU4196M/W33
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480
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790
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308
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590
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