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Home >  Products > Cylindrical Roller Bearings > Double-row cylindrical roller bearings
Double-row cylindrical roller bearings
Cylindrical Roller Bearings
Double-row cylindrical roller bearings
The double-row cylindrical roller bearing has two optional structures: cylindrical bore and tapered bore(suffix K),and two optional designs: NNU and NN. 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.
Details DrawingSpecifications Comments

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. 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.

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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