Cylindrical Roller Bearing

Double Row Cylindrical Roller Bearing

Double-row cylindrical bearings are designed for additional strength in carrying radial loads. These bearing types are interchangeable, so the dimensions and diameter under the rollers (NNU style) and diameter over the rollers (NN style) are held to an ISO/DIN standard. Interchangeability is designed for the ring without the rollers to allow interchange with competitor inner rings.

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Double-row cylindrical bearings are designed for additional strength in carrying radial loads. These bearing types are interchangeable, so the dimensions and diameter under the rollers (NNU style) and diameter over the rollers (NN style) are held to an ISO/DIN standard. Interchangeability is designed for the ring without the rollers to allow interchange with competitor inner rings.

Bearing Parameters

Boundary Basic load ratings Designations Structure size Installation dimersion Mass
mm kN mm mm kg
d D B rmin Cr Cor Current Original Fw Ew damin damax Damin Damax dbmin ramax
200 280 60 2.1 420 815 NN 3940 3282940 259 216 221 263 2 10.6
280 80 2.1 484 960 NN 4940K/W20 4182940Y 259 211 222 264 269 2 14.1
280 80 2.1 570 1220 NN 4940 4282940 259 211 222 264 269 2 15.3
280 80 2.1 570 1220 NNU 4940 4482940 225 211 222 269 228 2 15.3
310 82 2.1 655 1170 NN 3040 3282140 282 211 285 299 2 22.7
310 82 2.1 655 1170 NNU 3040 3482140 232 211 223 293 237 2 22.7
310 109 2.1 890 1730 NN 4040 4282140 282 216 225 293 2 30.4
220 300 60 2.1 440 895 NN 3944 3282944 279 236 241 283 2 11.4
300 80 2.1 600 1330 NN 4944 4282944 279 236 242 283 2 16.6
300 80 2.1 600 1330 NNU 4944 4482944 245 231 242 289 249 2 16.6
340 90 3 815 1480 NN 3044 3282144 310 233 313 327 2.5 29.6
340 90 3 815 1480 NNU 3044 3482144 254 230 313 327 2.5 30
340 118 3 1190 2400 NN 4044 4282144 310 233 313 327 2.5 39.8
370 120 4 1050 1810 NN 3144 3282744 331 241 346 3 51.9
370 120 4 1050 1810 NNU 3144 3482744 263 241 346 268 3 52.3
240 300 60 1.1 405 1030 NN 4848 4282848 283 248 255 287 290 1 9.77
300 60 1.1 358 930 NNU4848 259 248 255 290 263 1 9.9
320 60 2.1 460 975 NN 3948 3282948 300 251 262 309 2 12.2
320 80 2.1 625 1450 NN 4948 4282948 300 251 262 309 2 17.9
320 80 2.1 625 1450 NNU 4948 4482948 263 251 262 309 269 2 18
360 92 3 855 1600 NN 3048 3282148 330 253 333 347 2.5 32.7
360 92 3 855 1600 NNU 3048 3482148 274 253 266 347 280 2.5 32.7
360 118 3 1240 2600 NN 4048 4282148 330 253 266 333 347 2.5 39.3
360 118 3 1240 2600 NNU 4048 4482148 274 253 266 347 281 2.5 42.7
400 128 4 1170 2040 NN 3148 3282748 358 256 362 384 3 64.2
400 160 4 1880 3530 NNU 4148 4482748 282 256 282 384 291 3 85
260 360 75 2.1 670 1380 NN 3952 3282952 335 271 288 349 2 21.4
360 100 2.1 711 1540 NN 4952K 4182952 335 271 288 349 2 29.2
360 100 2.1 935 2100 NN 4952 4282952 335 271 288 349 2 28.3
360 100 2.1 935 2100 NNU 4952 4482952 292 271 288 349 296 2 31.1

 

Boundary Basic load ratings Designations Structure size Installation dimersion Mass
mm kN mm mm kg
d D B rmin Cr Cor Current Original Fw Ew damin damax Damin Damax dbmin ramax
260 400 104 4 969 1810 NN 3052K 3182152 364 276 367 384 3 47.1
400 104 4 969 1810 NN 3052 3282152 364 276 367 384 3 48.5
400 140 4 1550 3250 NN 4052 4282152 364 276 369 384 3 59.7
400 140 4 1550 3250 NNU 4052 4482152 300 276 289 384 299 3 65
440 144 4 1480 2660 NN 3152 3282752 393 276 415 424 3 89.1
440 180 4 2200 4000 NNU4152 4482752 306 276 300 424 310 3 113
280 350 69 1.1 445 1160 NN 4856 4282856 329 287.5 340 1 15.3
350 69 2 457 1200 NNU4856K 303 287.5 298 340 307 1 15.5
380 75 2.1 695 1460 NN 3956 3282956 355 291 369 2 22.7
380 100 2.1 960 2230 NN 4956 4284956 355 291 369 2 32.9
380 100 2.1 960 2230 NNU 4956 4482956 312 291 308 369 316 2 33
420 106 4 1020 1950 NN 3056K 3182156 384 296 387 404 3 49.1
420 106 4 1020 1950 NN 3056 3282156 384 296 387 404 3 49.9
420 106 4 1080 2080 NNU3056 320 300 440 326 3 51.4
460 146 5 1520 2790 NN 3156 3282756 413 300 416 440 4 95.7
300 380 80 2.1 690 1760 NNU 4860 4482860 324 308 320 369 330 2 21.7
420 118 3 1230 2870 NN 4960 4282960 388 314 335 398 2.5 51.6
420 118 3 1230 2870 NNU 4960 4482960 339 314 335 406 343 2.5 51.9
460 118 4 1180 2250 NN 3060 3282160 418 316 421 444 3 71.7
460 118 4 1180 2250 NN 3060K 3182160 418 316 421 444 3 69.6
460 160 4 1920 4100 NN4060 418 316 440 3 97.6
500 160 5 1760 3150 NN 3160 3282760 448 320 450 480 4 125
500 160 5 1760 3150 NNU 3160 3482760 358 320 480 365 4 126
320 400 80 2.1 700 1840 NNU 4864 4482864 346 328 340 389 350 2 22.8
440 118 3 1260 3050 NN 4964 4282964 408 334 355 427 2.5 50.2
440 118 3 1260 3050 NN 4964K 4182964 408 334 355 427 2.5 52
440 118 3 1260 3050 NNU 4964 4482964 359 334 355 426 363 2.5 54.9
480 121 4 1350 2670 NN 3064 3282164 438 336 442 464 3 76.6
480 121 4 1350 2670 NNU 3064 3482164 366 336 353 442 464 3 76.9
480 160 4 1960 4300 NNU 4064 4482164 367 336 353 464 364 3 103

 

Boundary Basic load ratings Designations Structure size Installation dimersion Mass
mm kN mm mm kg
d D B rmin Cr Cor Current Original Fw Ew damin damax Damin Damax dbmin ramax
320 540 176 5 2090 3750 NNU 3164 3482764 384 340 379 520 389 4 154
340 460 90 3 905 2020 NN 3968 3282968 428 353 375 447 2.5 42.9
460 118 3 1040 2450 NN 4968K 4182968 428 353 375 447 2.5 53.8
460 118 3 1350 3400 NN 4968 4282968 428 353 375 447 2.5 52.1
460 118 3 1350 3400 NNU 4968 4482968 379 354 375 446 383 2.5 57.8
520 133 5 1560 3020 NN 3068K 3182168 473 360 477 500 4 101
520 133 5 1560 3020 NN 3068 3282168 473 360 477 500 4 104
520 133 5 1560 3020 NNU3068 3482168 387 360 500 400 4 104
520 180 5 2420 5350 NNU 4068 4482168 385 360 377 500 389 4 141
360 480 90 3 930 2130 NN 3972 3282972 448 373 453 467 2.5 44.9
480 118 3 1390 3550 NNU 4972 4482972 399 374 395 466 403 2.5 60.6
540 134 5 1630 3240 NN 3072 3282172 493 380 497 520 4 106
540 134 5 1630 3240 NN 3072K 3182172 493 380 497 520 4 106
540 134 5 1630 3240 NNU 3072 3482172 413 380 520 420 4 108
540 180 5 2530 5450 NN 4072 3282172 496 380 397 520 4 132

Series of double-row cylindrical roller bearings

The standard assortment presented in this section includes:

  • NNU design bearings
  • NN design bearings
  • NN…K design bearings

Features of double row cylindrical roller bearings

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

Application of double row cylindrical roller bearings

Double row cylindrical roller bearings are industry interchangeable with like-size numbered bearings and are used in such applications as:

  • Gear Drives
  • Crop Shear
  • Rolling Mills
  • Machine Tools