Double Row Cylindrical Roller Bearings

Features: The double-row cylindrical roller bearing has two optional structures: cylindrical bore and tapered bore(suffix K),and two optional designs:
NNU and NN series cylindrical roller bearing. The NN design has an inner ring with two ribs and an outer ring without ribs.
The NNU design has an inner ring without ribs and an outer ring with two ribs.

Category:

The double-row cylindrical roller bearing is one separable type bearing and easy to assemble and disassemble.

The double-row cylindrical roller bearing has two optional structures: cylindrical bore and tapered bore(suffix K),and two optional designs: NNU and NN series cylindrical roller bearing. The NN design has an inner ring with two ribs and an outer ring without ribs. The NNU design has an inner ring without ribs and an outer ring with two ribs.

The tapered bore structure can allow the radial clearance to be adjusted when the bearing is installed. The double-row cylindrical roller bearing allows a certain axial displacement between the shaft and bearing housing and can be used as a non-locating bearing.

The advantages of the double-row cylindrical roller bearings are high stiffness and high precision, so they are usually used as main shaft bearings of precision machine tools.

Technical data

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
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
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
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
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
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
420 620 150 5 2130 4450 NN 3084 3282184 – 568 440 – 574 600 – 4 154
620 150 5 2130 4450 NNU 3084 3482184 478 – 440 – – 600 474 4 155
620 200 5 3150 7100 NN 4084 4282184 – 571 440 – 574 600 – 4 189
620 200 5 3400 7850 NNU 4084 4482184 469 – 440 460 – 600 474 4 209
700 224 6 3550 6800 NNU 3184 3482784 501 – 444 – – 660 508 5 347
440 540 100 2.1 950 2790 NNU 4888 4482888 470 – 448 464 – 529 476 2 49.5
650 157 6 2360 4900 NN 3088 3282188 – 596 466 – 600 624 – 5 177
650 157 6 2360 4900 NNU 3088 3482188 500 – 466 – – 624 507 5 178
720 226 6 3500 6800 NN 3188 3282788 – 649 466 – – 680 – 5 357
460 580 118 3 1200 3600 NNU4892 4482892 497 – 474 489 – 566 502 2.5 76
620 118 4 1610 3700 NN 3992 3282992 – 578 476 504 – 604 – 3 94.5
620 160 4 2400 6200 NNU 4992 4482992 510 – 476 504 – 604 515 3 140
680 163 6 2470 5070 NN 3092K 3182192 – 624 484 – 627 654 – 5 204
680 163 6 2470 5070 NN 3092 3282192 – 624 484 – 627 654 – 5 204
480 650 170 5 2690 7000 NN 4996 4282996 – 607 500 – – 630 – 4 164
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
480 700 165 6 2600 5550 NN 3096 3282196 – 643 506 – 648 674 – 5 211
700 218 6 4300 8600 NNU4096 4482196 533 – 506 523 – 674 538 5 273
790 248 7.5 4050 8100 NN 3196 3282796 – 708 512 – 718 758 – 6 447
500 670 170 5 2720 7200 NNU 49/500 44829/500 554 – 520 548 – 650 559 4 171
720 167 6 2580 5600 NN 30/500 32821/500 – 664 526 – 668 694 – 5 205
720 167 6 2580 5600 NNU 30/500 34821/500 563 – 526 – – 694 570 5 220
530 710 136 5 2040 4900 NN 39/530 32829/530 – 663 550 582 – 690 – 4 149
710 180 5 2900 7050 NNU 49/530 44829/530 588 – 550 582 – 690 593 4 202
780 185 6 3200 6900 NN 30/530 32821/530 – 715 556 – 720 754 – 5 296
560 750 140 5 2370 4860 NN 39/560 32829/530 – 705 576 – 711 735 – 4 188
750 190 5 3250 8700 NNU 49/560 44829/560 623 – 580 619 – 730 628 4 239
780 180 8 2400 6400 NN 6/560 2872/560 – 725 580 – 732 765 – 5 266
820 195 8 2460 6560 NN 30/560K 31821/560 – 756 586 – 761 794 – 5 341
820 258 6 4100 10600 NN 40/560 42821/560 – 745 586 – – 794 – 5 472
820 258 6 5720 13100 NNU 40/560 44821/560 626 – 586 615 – 794 632 5 420
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
560 920 280 7.5 6850 13700 NNU 31/560 34827/560 650 – 630 – – – 655 6 738
600 800 200 5 3850 10500 NNU 49/600 44829/600 666 – 620 662 – 780 672 4 284
800 200 5 3450 7180 NN 49/600K 41829/600 – 755 620 – – 780 – 4 257
870 200 6 3420 7785 NN 30/600 32821/600 – 803 626 – 808 844 – 5 355
870 272 6 6138 14040 NNU 40/600 44821/600 664 – 626 653 – 844 670 5 530
980 375 7.5 8910 18990 NNU 41/600 44827/600 699 – 633 682 – 947 706 6 1100
630 780 150 4 2290 7000 NNU 48/630 44828/630 676 – 646 667 – 764 676 3 160
850 218 6 4200 11400 NN 49/630 42829/630 – 793 656 – – 824 – 5 328
850 218 6 4000 10800 NNU 49/630 44829/630 704 – 656 699 – 824 710 5 356
920 212 7.5 3860 8820 NN 30/630 32821/630 – 845 663 – 851 887 – 6 430
920 290 7.5 6885 15750 NNU 40/630 44821/630 699 – 663 688 – 887 705 6 635
1030 400 7.5 9900 21600 NNU 41/630 44827/630 734 – 663 716 – 997 740 6 1330
670 900 230 6 4450 12330 NN 49/670 42829/670 – 838 696 – – 874 – 5 419
900 230 6 4950 13100 NNU 49/670 44829/670 738 – 696 732 – 874 744 5 430
980 230 7.5 4620 10260 NN 30/670K 31821/670 – 901 703 – 907 947 – 6 597
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
670 980 308 7.5 7578 17640 NNU 40/670 44821/670 744 – 703 733 – 947 750 6 765
1090 412 7.5 10890 22950 NNU 41/670 44827/670 774 – 703 756 – 1057 780 6 1500
710 870 160 4 2640 8350 NNU 48/710 44828/710 759 – 726 750 – 854 759 3 203
950 243 6 4850 13770 NNU49/710 44829/710 782 – 736 776 – 924 788 5 480
1030 236 7.5 5148 11880 NN 30/710 32821/710 – 951 743 – 957 997 – 6 590
1030 315 7.5 8415 19440 NNU 40/710 44821/710 784 – 743 772 – 997 790 6 850
1150 438 9.5 12060 25650 NNU 41/710 44827/710 820 – 750 800 – 1110 826 8 1790
750 920 170 5 3070 9180 NN 48/750 42828/750 – 879 770 – 887 904 – 4 240
1000 250 6 4950 14400 NNU 49/750 44829/750 831 – 776 824 – 974 837 5 540
1090 250 7.5 6336 14400 NN 30/750 32821/750 – 1007 783 – 1011 1057 – 6 705
1090 335 7.5 9180 21600 NNU 40/750 44821/750 830 – 783 816 – 1057 836 6 925
1220 475 9.5 14490 31950 NNU 41/750 44827/750 871 – 790 850 – 1180 877 8 2230
800 1060 258 6 5247 15300 NNU 49/800 44829/800 884 – 826 876 – 1034 890 5 615
1150 258 7.5 7029 16200 NN 30/800 32821/800 – 1065 833 – 1071 1117 – 6 790
1150 345 7.5 9720 23400 NNU 40/800 44821/800 885 – 833 871 – 1117 891 6 1140
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
800 1280 475 9.5 14850 32850 NNU 41/800 44827/800 921 – 840 900 – 1240 928 8 2390
850 1030 180 5 3400 11400 NNU48/850 44828/850 905 – 888 – – – 912 4 310
1120 272 6 5346 16200 NNU 49/850 44829/850 939 – 876 930 – 1094 946 5 715
1220 272 7.5 7128 16740 NN 30/850 32821/850 – 1130 883 – 1136 1187 – 6 940
1220 365 7.5 10530 25650 NNU 40/850 44821/850 940 – 883 923 – 1187 947 6 1340
1360 500 6 19080 40500 NNU 41/850 44827/850 976 – 897 935 – 1334 963 5 2900
900 1180 280 6 5940 18000 NNU 49/900 44829/900 986 – 926 977 – 1154 993 5 805
1280 280 7.5 7425 18000 NN 30/900 32821/900 – 1185 933 – 1191 1257 – 6 1050
1280 375 7.5 11520 28350 NNU 40/900 44821/900 990 – 933 963 – 1257 997 6 1500
1420 515 6 19800 42750 NNU 41/900 44827/900 1032 – 947 1008 – 1394 1039 5 3180
950 1250 300 7.5 6633 20160 NNU 49/950 44829/950 1046 – 983 1036 – 1217 1053 6 960
1360 300 7.5 8217 20160 NN 30/950 32821/950 – 1255 983 – 1263 1327 – 6 1300
1360 412 7.5 12780 31950 NNU 40/950 44821/950 1050 – 983 1033 – 1327 1057 6 1900
950 1500 545 6 22950 51300 NNU 41/950 44827/950 1092 – 997 1068 – 1474 1099 5 3830
1000 1320 315 7.5 7722 23400 NNU 49/1000 44829/1000 1103 – 1033 1096 – 1287 1110 6 1250
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
1000 1320 315 7.5 8580 25200 NN49/1000 42829/1000 – 1238 1033 – 1249 1287 – 6 1200
1420 308 7.5 9090 22050 NN 30/1000 32821/1000 – 1316 1033 – 1324 1387 – 6 1400
1420 412 7.5 13860 34200 NNU 40/1000 44821/1000 1101 – 1033 1084 – 1387 1108 6 2000
1580 580 6 24750 55800 NNU 41/1000 44827/1000 1154 – 1047 1128 – 1474 1161 5 4270
1060 1400 335 7.5 9450 27450 NNU 49/1060 44829/1060 1160 – 1093 1150 – 1367 1167 6 1350
1500 325 9.5 9900 24750 NN 30/1060 32821/1060 – 1391 1100 – 1399 1460 – 8 1650
1660 600 7.5 27270 62550 NNU 41/1060 44827/1060 1214 – 1116 1189 – 1627 1221 6 5070
1120 1460 335 7.5 9450 28350 NNU 49/1120 44829/1120 1220 – 1153 1210 – 1427 1227 6 1450
1750 630 7.5 30240 68850 NNU 41/1120 44827/1120 1279 – 1176 1253 – 1717 1286 6 5600
1180 1540 355 7.5 10710 32400 NNU 49/1180 44829/1180 1285 – 1213 1270 – 1507 1293 6 1650
1850 670 7.5 33210 76500 NNU 41/1180 44827/1180 1350 – 1227 1320 – 1817 1358 6 7200
1250 1950 710 7.5 37620 88200 NNU 41/1250 44827/1250 1426 – 1297 1396 – 1917 1434 6 8000
1320 1720 400 7.5 12420 38250 NNU 49/1320 44829/1320 1440 – 1353 1420 – 1687 1448 6 3100
1720 400 7.5 13800 42500 NN49/1320 42829/1320 – 1620 1353 – 1640 1687 – 6 3060
2060 750 7.5 41130 95400 NNU 41/1320 44827/1320 1507 – 1367 1474 – 2027 1515 6 9400
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
1400 2180 775 9.5 44550 104400 NNU 41/1400 44827/1400 1598 – 1470 1564 – 2140 1608 8 10700
1500 2300 800 9.5 47520 118800 NNU 41/1500 44827/1500 1709 – 1570 1674 – 2260 1718 8 12300

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