Performance Test Data - NTN Global · 2020. 3. 18. · NTN-SNR Rodamientos Ibérica / Calle...

5
Sealed Four Row Tapered Roller Bearings for Rolling Mill Roll-Necks [CROU..LL Type] CAT. No. 3801/E

Transcript of Performance Test Data - NTN Global · 2020. 3. 18. · NTN-SNR Rodamientos Ibérica / Calle...

  • Performance Test Data

    ULTAGE Sealed Four Row Tapered Roller Bearings for Rolling Mill Roll-Necks [CROU..LL Type]

    ●Water Resistance Durability Test

    [Test conditions] Bearing number: ULTAGE sealed four row tapered roller bearing CROU-6001LLAX1 (Dimensions:φ300×φ420×310, Cr: 3600 kN, C0r: 7650 kN) Prelubricating grease: Palmax RBG Radial load: 390 kN (0.11 Cr) Running speed: Cyclic operation where one cycle consists of ⇒300 min-1 (0.5 h) ⇒ 500 min-1 (1 h) ⇒ standstill (1 h) Water spray: 0.15 L/min Total running hours: 1000 h

    ●Life test result

    [Test conditions] Bearing number: Comparison of conventional design and ULTAGE in terms of life 30316U (dimensions:φ80×φ170×42.5) Lubrication: Turbine Oil VG68, circulating lubrication Combined radial and axial loads: 117 kN/bearing (0.4 Cr equivalent, radial load: 75 kN/bearing, axial load: 50 kN/bearing) Running speed: 2000 min-1

    Misalignment: 1/600 (0.1˚)

    Structure of test rig

    Appearance of test rig

    Rollers on side A Outer ring on side B Outer ring on side C Outer ring on side DRollers on side D

    0.03% 0.02% 0.02% 0.03% 0.02%

    0.27% 0.03% 2.01% 0.03% 0.04%

    Appearance ofassembled inner ring

    Appearance ofouter ring

    Flaking

    Flaking

    No damage

    No damage

    Status

    Structure of test rig

    ULTAGE bearings boast a life 2.6 times as long as their design life, and twice as long as the life of conventionalbearings, when both bearing types are tested under test conditions of 0.4 Cr and 1/600 misalignment.

    A B C D

    Load

    Test bearing

    Test bearing 2Test bearing 1

    Waterspray

    Fr

    Fa

    Flaking occurred nearthe chamfered end ofrollers as well as at thecorresponding contactpoint on the outer ring.(L10 = 225 h)

    After termination of thetest at 690 hours, thetest bearing was freefrom any failuresincluding flaking.

    [Test result]

    Conventional designL10 life 225 h(n = 6)

    CalculatedL10 life173 h

    ULTAGE designMinimum L10 life 450 h(n = 6)

    99

    80

    50

    20

    10

    5

    1101 102 103 104

    Cum

    ulat

    ive

    frac

    ture

    pro

    babi

    lity

    (%)

    Life (h)

    [Status of bearing interior after test, and water content in grease (wt%)]* Water content in factory-fresh grease is in the range of 0.001% to 0.04%.

    Con

    vent

    iona

    lse

    alH

    igh

    sea

    ling

    seal

    Evidence of water intrusion is found on the conventional seal. In contrast, the NTN “high sealing”seal does not exhibit evidence of water intrusion.

    Con

    vent

    iona

    lde

    sign

    ULT

    AG

    E

    HEADQUARTERSNTN Corporation URL http://www.ntn.co.jp1-3-17, Kyomachibori, Nishi-ku, Osaka-shi, Osaka 550-0003 Japan

    Phone: +81-6-6443-5001

    NTN USA Corporation URL http://www.ntnamerica.com1600 E. Bishop Court, P.O. Box 7604, Mount Prospect, IL 60056-7604, U.S.A. Phone: +1-847-298-7500 Fax: +1-847-294-1209

    SALES NETWORKNTN Bearing Corp. of AmericaHead Office / 1600 E. Bishop Court, P.O. Box 7604, Mount Prospect, IL 60056-7604, U.S.A. Phone: +1-847-298-7500 Fax: +1-847-699-9744Central Sales Office / 2413 North Main Street, East Peoria, Illinois 61611 Phone: +1-309-699-8600 Fax: +1-309-699-8670NTN Automotive Center / 39255 W. 12 Mile Road, Farmington Hills, MI 48331-2975, U.S.A. Phone: +1-248-324-4700 Fax: +1-248-324-1103

    NTN Bearing Corp. of Canada Ltd. URL http://www.ntn.caHead Office / 305 Courtneypark Drive West, Mississauga, Ontario, L5W 1Y2, Canada Phone: +1-905-564-2700 Fax: +1-905-564-7749Vancouver Branch / 106B - 3680 Bonneville Place Burnaby, B.C. V3N 4T6, Canada Phone: +1-604-444-2007 Fax: +1-604-444-2665Edmonton Branch / 4608-97th Street, Edmonton, Alberta T6E 5N9, Canada Phone: +1-780-435-6200 Fax: +1-780-435-3600Toronto Branch / 305 Courtneypark Drive West, Mississauga, Ontario L5W 1Y4, Canada Phone: +1-905-564-9600 Fax: +1-905-564-9609Montreal Branch / 4973 Levy Street, Ville, St-Laurent, Quebec, H4R 2N9, Canada Phone: +1-514-333-8054 Fax: +1-514-333-1078

    NTN Wälzlager (Europa) GmbH.URL http://www.ntn-snr.comHead Office / Max-Planck-Str. 23, 40699 Erkrath, F.R. Germany Phone: +49-211-2508-0 Fax: +49-211-2508-400Stuttgart Branch / Plieninger Str. 63B, 70794 Filderstadt F.R. Germany Phone: +49-711-123901-0 Fax: +49-711-123901-660München Branch / Parkring 4, 85748 Garching (München), F.R. Germany Phone: +49-211-2508-0 Fax: +49-211-2508-555Hamburg Branch / Barkhausenweg 7, 22339 Hamburg, F.R. Germany Phone: +49-211-2508-0 Fax: +49-211-2508-415Italy Branch / Via Maestri del Lavoro, 3/A, 40138 Bologna, Italy Phone: +39-051-535174 Fax: +39-051-538492

    NTN Bearings (UK) Ltd. URL http://www.ntn-snr.comWellington Crescent, Fradley Park, Lichfield, Staffordshire, WS13 8RZ, U.K. Phone: +44-1543-445000 Fax: +44-1543-445035

    NTN-SNR ROULEMENTS. URL http://www.ntn-snr.comHead Office / 1, rue des Usines B.P. 2017 74010 Annecy Cedex, France Phone: +33-4-50-65-30-00 Fax: +33-4-50-65-32-91Lyon Branch / Le Florentin, 71, Chemin du Moulin Carron, BP8-69570 DARDILLY, France Phone: +33-4-78-66-68-00 Fax: +33-4-78-66-68-20Paris Branch / 6, rue Auguste Comte, BP49, 92174 Vanves Cedex, France Phone: +33-1-40-93-66-00 Fax: +33-1-40-93-66-10Cran Gevrier Branch / 6 route de la Salle, 74960, Cran Gevrier, France Phone: +33-4-50-65-93-00 Fax: +33-4-50-65-93-46

    SNR Wälzlager GmbH. Duesseldorf Branch / Max-Planck-Str. 23, 40699 Erkrath, F.R.Germany Phone: +49-211-2508-0 Fax: +49-211-2508-400 Bielefeld Branch / Friedrich-Hagemann-Straße 66, 33719 Bielefeld, Germany Phone: +49-521-9-24-00-0 Fax: +49-521-9-24-00-90 Stuttgart Branch / Plieninger Str. 63B, 70794 Filderstadt F.R.Germany Phone: +49-711-123901-0 Fax: +49-711-123901-660

    SNR Italia / Via Riccardo Lombardi, 19/4, 20153 Milan, Italy Phone: +39-02-47-99-86-00 Fax: +39-02-33-50-06-56NTN-SNR Rodamientos Ibérica / Calle Barberán n˚6, 28035 Madrid, Spain Phone: +34-916-71-89-13 Fax: +34-916-73-65-48NTN-SNR Rulmenti / Zona Industriala-Vest, 6 Strada Salzburg, 24 00 SIBIU, Romania Phone: +40-269-20-35-00 Fax: +40-269-20-35-25NTN-SNR Marocco / 73, boulevard Moulay Slimane, Ain Sebaâ Casablanca, BP 15873 Casa-Principal, Marocco Phone: +212-522-66-76-80 Fax: +212-522-66-5166

    NTN Bearing-Singapore (Pte) Ltd. URL http://www.ntn.com.sgHead Office / No.9 Clementi Loop Singapore 129812 Phone: + 65-64698066 Fax: +65-64695400Philippine Representative Office / Unit 1002 Philippine Axa Life Centre Condominium Corporation Sen. Gil Puyat Ave Corner Tindalo Street Makati City, Philippines Phone: +63-2-759-4407 Fax: +63-2-759-4409India Representative Office / 805, International Trade Tower, Nehru Place, New Delhi 110019, India Phone: +91-11-51513234 Fax: +91-11-51513236Indonesia Representative Office / Summitmas 1., 18th Floor, Jl. Jend. Sudirman Kav. 61-62, Jakarta 12190, Indonesia Phone: +62-21-252-2081 Fax: +62-21-252-2082Vietnam Representative Office / 303, 3rd of Thanh Dong Building 132 - 138 Kim Ma Str., Ba Dinh Dist., Ha Noi, Viet Nam Phone: +84-4-37347661 Fax: +84-4-37347662

    NTN (China) Investment Corp. URL http://www.ntn.com.cnShanghai Head Office / No.6 building No.1666 Nanle Road, Songjiang Industrial Zone, Songjiang, Shanghai, China Phone: +86-21-5774-5500 Fax: +86-21-5778-2898Beijing Branch / Units 08, EF floor, West Tower, LG Twin Tower, 12 Jian Guo Men Wai Yi, Chaoyang District, Beijing, China 100022 Phone: +86-10-6568-3069 Fax: +86-10-6568-2278Guangzhou Branch / Rm 7306 CiticPlaza, 233 Tianhe North Road, Guangzhou, China 510613 Phone: +86-20-3877-2943 Fax: +86-20-3877-2942Nanjing Branch / 18A, Nanjing IFC, NO.1 Hanzhong Rd, Baixia district, Nanjing, CHINA 210029 Phone: +86-25-8477-5355 Fax: +86-25-8477-5360

    NTN China Ltd. URL http://www.ntnchina.comHong Kong Office / Room 1914-15, Park-In Commercial Centre, 56 Dundas Street, Mongkok, Kowloon, Hong Kong Phone: +852-2385-5097 Fax: +852-2385-2138

    NTN Bearing-Thailand Co., Ltd.Head Office / 12th Floor, Panjathani Tower, 127/15 Nonsee Road, Chongnonsee Yannawa, Bangkok 10120, Thailand Phone: +66-2-681-0401 Fax: +66-2-681-0408Khon Kaen Branch / 189-191 Ruen Rom Road Tambon Nai-Muang, Amphur Muang, Kohn Kaen, 40000, Thailand Phone: +66-43-223679 Fax: +66-43-223061Haad Yai Branch / 198-198/1 Nipat U-Thid 2 Road, Amphur Haad Yai, Songkhla, 90110, Thailand Phone: +66-74-236568 Fax: +66-74-231520Bangna Branch / 35/35 Bangna-Trad Road, KM11 Bangplee, Samutprakarn, 10540, Thailand Phone: +66-2-7501732 Fax: +66-2-7501731Chiangmai Branch / 46/8-10 Thy wang Rd. Changmoi sub.district, Munag district, Chiangmai province, 50300 Thailand Phone: +66-53-874328 Fax: +66-53-874330

    NTN Bearing-Malaysia Sdn. Bhd.Head Office / No.2, Jalan Arkitek U 1/22, Hicom Glenmarie Industrial Park, 40150 Shah Alam, Selangor, Malaysia Phone: +60-3-55696088 Fax: +60-3-55690200Butterworth Branch / 4700, Jalan Permatang Pauh, 13400 Butterworth, Malaysia Phone: +60-4-3328312 Fax: +60-4-3324407Ipoh Branch Office /65, Medan Kidd, Kinta Mansion, 30200 Ipoh, Malaysia Phone: +60-5-2547743 Fax: +60-5-2538077Kuantan Branch / B-72, Ground Floor, Jalan Beserah 25300 Kuantan, Malaysia Phone: +60-9-5141132 Fax: +60-9-5141164Johor Bahru Branch / 51 Jalan, Sri Bahagia 5, Taman Sri Bahagia, Tampoi, 81200 Johor Bahru, Malaysia Phone: +60-7-2364929 Fax: +60-7-2370897

    PT. NTN Bearing IndonesiaC-21, 22 MM2100 Industrial Town, Cikarang Barat, BEKASI 17520 West Jave Indonesia Phone : +62-21-252-2081 Fax : +62-21-252-2082

    NTN-CBC (Australia) Pty. Ltd.3, The Crescent, Kingsgrove, NSW 2008, Australia Phone: +61-2-99479200 Fax: +61-2-95543311

    NTN de Mexico, S.A. URL http://www.ntnmexico.com.mxMexico Head Office / Emilio Cárdenas No.158 Apdo.124, C.P.54030, Tlalnepantla, Edo.deMéxico, Mexico Phone: +52-55-5390-1133 Fax: +52-55-5565-8545Guadalajara Branch / Calle 22 No.2465, Zona Industrial, C.P.44940, Guadalajara, Jalisco, Mexico Phone: +52-33-3145-1448 Fax: +52-33-3145-1594Monterrey Branch / Av. Ruiz Cortines No.1336 Ote, Col. La Purisima, C.P.67120, Cd. Guadalupe, Nuevo Leon, Mexico Phone: +52-818-334-9931 Fax: +52-818-334-9932Mexicali Branch / Blvd. Benito Juárez No.3293 Esq. Ayuntamiento, C.P.21360, Mexicali, BCN, Mexico Phone: +52-686-563-3632 Fax: +52-686-582-2057Veracruz Branch / María Auxiliadora No.687 Esq. J.F.Molina, C.P.91870, Col. Los Pinos, Veracruz, Mexico Phone: 52-229-934-4757 Fax: +52-229-938-0457

    NTN Sudamericana, S.A.URL http://www.ntnsudamericana.comWorld Trade Center Panama Calle 53 Este, Urbanización Marbella Piso NO.16, Oficina 1601 Apartado Postal 832-0487, Panamá, Rep.de Panamá Phone: +507-269-4777 Fax: +507-264-5592

    NTN do Brasil Ltda. URL http://www.ntn.com.brAv. Moema, 94-9˚ Andar-conj, 92a94 CEP 04077-020-Indianópolis-São Paulo-SP, -Brasil Phone: +55-11-5051-0600 Fax: +55-11-5051-2807

    NTN Korea Co., Ltd.Head Office / 10th Floor, Press Center, 25, Taepyeong-Ro 1-GA, Jung-Gu, Seoul 100-745, Korea Phone: +82-2-720-3665 Fax: +82-2-720-3669Busan Branch / Rm.707, 7th Floor, Daerim Bldg., 341-5 Bujeon 1-Dong, Busanjin- Gu, Busan, Korea, 614-843 Phone: +82-51-811-1351 Fax: +82-51-811-1353

    NOTE : The appearance and specifications may be changed without prior notice if required to improve performance. Although care has been taken to assure the accuracy of the data compiled in this catalog, NTN does not assume any liability to any company or person for errors or omissions.

    AE72 CAT. No. 3801/E 12. 03. 06. NPrinted in Japan

    Sealed Four Row Tapered Roller Bearingsfor Rolling Mill Roll-Necks

    [CROU..LL Type]

    CAT. No. 3801/E

  • CROU-4401LLA1X

    CROU-4501LLA1X

    CROU-4801LLA1X

    CROU-4802LLA1X

    CROU-5001LLA1X

    CROU-5201LLA1X

    CROU-6001LLA1X

    CROU-6201LLA1X

    CROU-8201LLA1X

    CROU-8801LLA1X

    CROU-8802LLA1X

    CROU-10601LLA1X※

    CROU-4402LLA1X

    CROU-5101LLA1X

    CROU-6101LLA1X

    CROU-6901LLA1X

    CROU-6902LLA1X

    CROU-10001LLA1X※

    CROU-11901LLA1X

    220

    225

    240

    240

    250

    260

    300

    310

    410

    440

    440

    530

    220.662

    254.000

    304.902

    343.052

    343.052

    501.650

    595.312

    180250315400500630800

    250315400500630800

    1 000

    0000000

    -30-35-40-45-50-75

    -100

    +750+900

    +1 000+1 200+1 200+1 500+1 500

    -750-900

    -1 000-1 200-1 200-1 500-1 500

    303540455075

    100

    5060708090

    105120

    23263034385675

    295

    320

    338

    338

    365

    365

    420

    430

    546

    590

    620

    780

    314.325

    358.775

    412.648

    457.098

    457.098

    711.200

    844.550

    315

    230

    248

    340

    270

    340

    310

    350

    400

    480

    454

    570

    239.712

    269.875

    266.700

    254.000

    299.000

    520.700

    615.950

    315

    230

    248

    340

    270

    340

    310

    350

    400

    480

    454

    570

    239.712

    269.875

    266.700

    254.000

    299.000

    520.700

    615.950

    0.093~0.106

    0.099~0.115

    0.104~0.118

    0.107~0.123

    0.113~0.129

    0.115~0.131

    0.131~0.147

    0.136~0.154

    0.173~0.188

    0.188~0.204

    0.195~0.211

    0.244~0.259

    0.098~0.111

    0.111~0.127

    0.130~0.150

    0.136~0.158

    0.143~0.163

    0.206~0.226

    0.266~0.282

    0.420~0.480

    0.360~0.420

    0.450~0.510

    0.400~0.460

    0.420~0.480

    0.430~0.490

    0.490~0.550

    0.520~0.590

    0.780~0.850

    0.850~0.920

    0.880~0.950

    1.100~1.170

    0.450~0.510

    0.430~0.490

    0.450~0.520

    0.430~0.500

    0.500~0.570

    0.730~0.800

    1.200~1.270

    1

    1

    1

    1

    1

    1

    1

    1

    1.5

    1.5

    3

    3

    1

    1

    1

    1

    1

    3

    3

    2.5

    2.5

    2.5

    2.5

    2.5

    2.5

    2.5

    2.5

    2.5

    2.5

    2.5

    2.5

    2.5

    2.5

    2.5

    2.5

    2.5

    2.5

    2.5

    Bearingnumbers

    Boundary dimensions Standardradial clearance

    (approx.)mm

    mm mm

    (1) Inner rings

    mm Δdmp Vdp Vdmpd

    over incl. high lowΔB2s, ΔC2s

    high lowmax maxKiamax

    d D B C r1s min

    1 880

    1 870

    2 320

    2 960

    2 760

    3 340

    3 600

    4 020

    5 520

    6 600

    7 600

    13 400

    2 240

    2 760

    2 800

    2 820

    3 500

    10 000

    13 900

    4 650

    3 700

    4 600

    6 850

    5 300

    7 450

    7 650

    8 900

    13 300

    16 200

    16 700

    29 400

    4 350

    5 700

    5 850

    5 950

    8 150

    23 900

    33 000

    192 000

    190 000

    236 000

    302 000

    280 000

    340 000

    366 000

    410 000

    562 000

    670 000

    780 000

    1 370 000

    228 000

    282 000

    286 000

    288 000

    356 000

    1 020 000

    1 420 000

    475 000

    375 000

    470 000

    700 000

    540 000

    760 000

    780 000

    910 000

    1 350 000

    1 650 000

    1 700 000

    3 000 000

    440 000

    580 000

    600 000

    605 000

    830 000

    2 440 000

    3 350 000

    235

    241

    259

    257

    272

    275

    318

    329

    434

    462

    473

    581

    240

    274

    323

    360

    364

    542

    638

    267

    294

    309

    299

    333

    327

    382

    388

    504

    540

    570

    710

    290

    328

    379

    423

    423

    642

    770

    0.33

    0.41

    0.35

    0.40

    0.40

    0.40

    0.40

    0.39

    0.33

    0.33

    0.33

    0.33

    0.33

    0.39

    0.43

    0.47

    0.43

    0.42

    0.33

    2.03

    1.64

    1.95

    1.68

    1.68

    1.68

    1.68

    1.72

    2.03

    2.03

    2.03

    2.03

    2.07

    1.74

    1.56

    1.43

    1.57

    1.60

    2.03

    Axial load factorConstantAbutment andfillet dimensions

    eda Da Y1

    3.02

    2.44

    2.90

    2.50

    2.50

    2.50

    2.50

    2.56

    3.02

    3.02

    3.02

    3.02

    3.09

    2.59

    2.32

    2.12

    2.34

    2.38

    3.02

    Y2

    1.98

    1.6

    1.91

    1.64

    1.64

    1.64

    1.64

    1.68

    1.98

    1.98

    1.98

    1.98

    2.03

    1.70

    1.52

    1.40

    1.53

    1.56

    1.98

    Y0

    1 Y1 0.67 Y2

    FaFr

    X Y X Y

    ≦eFaFr>e

    Equivalent radial loaddynamicPr=XFr+YFa

    staticPor=Fr+YoFa For values of e, Y1, Y2 and Yosee the table below.

    Dimension Table (For information about bearing models not listed in the Dimension Table, contact NTN Engineering.)

    Metric series Tolerances [JIS 0 Class] Inch series Tolerances [ABMA 0 Class]

    Standard Prelubricating Grease

    Fit (recommended)

    Materials

    Bearing Number

    Chamfer Dimension

    Operating Temperature Range

    ● Brand: Kyodo Yushi Palmax RBG (L373) ● Fill amount: Space volume ratio 35%

    ● Metric series: Shaft d6/ Housing G7 ● Inch series: Contact NTN Engineering for technical assistance.

    Limiting Speed

    ●dm・N≦30×104

      dm:bearing center diameter (mm)=(d+D) /2   d:bearing bore diameter (mm)   D:bearing outside diameter (mm)   N:running speed (min-1)

    ● Inner and outer rings: Case hardening steel ● Rolling element: Bearing steel ※ mark only: Case hardening steel

    The values above are shown as a guide, and may not bemet under certain operating conditions.For details, contact NTN Engineering.

    Features

    ● -20 to +120˚C(A-) CROU- 6001 LLA1X PX1

    Accuracy codeSeal code

    Bearing bore number + added numberBearing type (ULTAGE Series four row tapered roller bearing)

    Optional (special heat treatment 1) )

    NOTE 1) Carbonitriding

    76.2266.7304.8609.6

    266.7304.8609.6914.4

    0000

    +25+25+51+76

    (1) Inner rings

    Δds

    over incl. high low

    (3) Radial deflection of inner and outer rings

    266.7304.8609.6

    304.8609.6914.4

    +25+51+76

    000

    (2) Outer rings

    over incl. high low

    266.7304.8609.6

    304.8609.6914.4

    515176

    Kia, Kea

    Radial runout

    over incl.

    180250315400500630800

    250315400500630800

    1 000

    0000000

    -30-35-40-45-50-75

    -100

    303540455075

    100

    50607080

    100120140

    23263034385675

    (2) Outer rings

    mmD

    over incl. high low max max max

    max

    (4) Combination width deviation of 4-row bearings

    101.6304.8304.8609.6

    304.8609.6609.6―

    over incl.

    ―508.0

    508.0―

    +1 520+1 520+1 520+1 520

    -1 520-1 520-1 520-1 520

    over incl. high low

    1. High load capacity design —the world’s highest level Maximum size and number of rollers help realize high load capacity and longer life.

    2. High load resisting design —the world’s highest level Assurance of uniform contact pressure on rolling elements within bearings and against outside loads has helped greatly enhance load resistance performance.

    3. Compact high sealing design “High sealing” fluoro-rubber seals, boasting a minimized seal volume, are adopted as standard. Through optimization of the tightening force of the main lip and the provision of a shielding arrangement against foreign substances, the water intrusion volume has been reduced by more than 50%: at the same time, the sub lip helps prevent the outflow of grease.

    4. Long-life grease as standard The bearing is prefilled with long-life grease. A rinsing and/or grease prefilling procedure is not necessary when the bearing is installed on the side of the machine.

    40%increase

    Loadcapacity

    ®

    1rs min

    1

    2 Standardaxial clearance

    2

    [CROU..LL Type]

    Patent pending

    Patent pending

    1.9 350 ― 1

    Unit : mm

    rs min or

    r1s min over incl.

    rs max or r1s max

    2.83.5

    3.54

    120250

    250― 1.5

    44.5

    5.56

    120250

    250―

    2.5

    4.555.5

    6.577.5

    120250400

    250400―

    3

    kN kgfC0r C0rCr Cr

    mm

    φD φd φda φDa

    B

    r1

    r

    C

    ●Design that maximizes load capacity —rollers (size and number) as wells as the cage. ●Newly developed crowning

    helps improve load resistance performance.

    Conventional design

    Conventional design

    ULTAGE design

    ULTAGE design

    Critical contact pressure

    Axial position on roller

    O-ring O-ring

    Main lip Sub lip

    Main lip(w/ shielding mechanism)

    Fluoro-rubber seal

    Shieldingmechanism

    New crowning designis adopted for rollingelements.

    Conventional crowning

    Unit : μm

    Unit : μmUnit : μm

    Unit : μm

    Unit : μm

    Unit : μmSealed Four Row Tapered Roller Bearingsfor Rolling Mill Roll-NecksThe ULTAGE series sealed four row tapered roller bearings (CROU..LL type) are new standard series productsespecially developed to satisfy the “high load capacity”, “high load resistance performance” and “high sealingperformance” required for steel mill roll-neck applications and to improve reliability through long life design.

    The ULTAGE series sealed four row tapered roller bearings (CROU..LL type) are new standard series productsespecially developed to satisfy the “high load capacity”, “high load resistance performance” and “high sealingperformance” required for steel mill roll-neck applications and to improve reliability through long life design.

    • Compact seal design helpsmaximize bearing side volume.• Maximization in the size andnumber of rollers helps realize

    high load capacity.

    • Newly developed crowninghelps reduce and ensureuniform contact pressure.• World’s highest level in

    load resistanceperformance.

    • Newly developed seal lipdesign significantly reduces

    water intrusion volume.• Fluoro-rubber seal boasts

    more positive sealingperformance.

    Twice asgreat

    Loadresistance

    Sealingperformance50%

    reduction in waterintrusion volume

    Compact sealcase design

    Seals with improvedwater intrusionperformance

    Phosphatecoatingon the entiresurface

    High loadcapacity design

    High loadresistance design

    "ULTAGE " (a name created from the combination of "ultimate," signifying refinement,and "stage," signifying NTN's intentionthat this series of products be employed in diverse applications) is the general name for NTN's new generation of bearings thatare noted for their industry-leading performance.

    ®

    ®

    Newly developed crowning

    Contact pressurereduced by halfC

    onta

    ct p

    ress

    ure

    Excessively highcontact pressure

    Side face of innerring or centerwasher, or side faceof outer ring

    Bore diameter face of bearing or outer diameter face ofbearing (Axial direction)

    rs min or r1s min (Rad

    ial d

    irect

    ion)

    rs max or r1s max

    rs m

    in o

    r r1

    s m

    in

    rs m

    ax o

    r r1

    s m

    ax

    rs min or r1s min

    Nominalbore diameter

    d

    Radialdirection

    Axialdirection

    Ser

    ies

    Met

    ric

    seri

    esIn

    ch s

    erie

    s

    Basic load ratingsdynamic static dynamic static

    1 Minimum allowable value of chamfer dimension r. 2 Depending on operating conditions, appropriate values may vary. Contact NTN Engineering for technical assistance.

    ULTAGE Sealed Four Row Tapered Roller Bearings for Rolling Mill Roll-Necks [CROU..LL Type]

    Nominal borediameter

    mmd

    Nominal borediameter

    mmd

    Nominal borediameter

    Single borediameter deviation

    ΔDs

    Single outsidediameter deviation

    Nominal outsidediameter

    mmD

    Nominal outsidediameter

    mmD

    Nominal outsidediameter

    mmD

    Nominal outsidediameter

    Inner ringradial runout

    Inner ringradial runout

    Combination width deviation of

    4-row bearings

    ΔB2s, ΔC2s

    Combination width deviation of

    4-row bearings

    Dimensional toleranceof mean bore

    diamteter within plane

    Dimensional toleranceof mean outside

    diamteter within plane

    Borediametervariation

    Outsidediametervariation

    Mean borediametervariation

    Mean outsidediametervariation

    ΔDmp VDp VDmp Kea

  • CROU-4401LLA1X

    CROU-4501LLA1X

    CROU-4801LLA1X

    CROU-4802LLA1X

    CROU-5001LLA1X

    CROU-5201LLA1X

    CROU-6001LLA1X

    CROU-6201LLA1X

    CROU-8201LLA1X

    CROU-8801LLA1X

    CROU-8802LLA1X

    CROU-10601LLA1X※

    CROU-4402LLA1X

    CROU-5101LLA1X

    CROU-6101LLA1X

    CROU-6901LLA1X

    CROU-6902LLA1X

    CROU-10001LLA1X※

    CROU-11901LLA1X

    220

    225

    240

    240

    250

    260

    300

    310

    410

    440

    440

    530

    220.662

    254.000

    304.902

    343.052

    343.052

    501.650

    595.312

    180250315400500630800

    250315400500630800

    1 000

    0000000

    -30-35-40-45-50-75

    -100

    +750+900

    +1 000+1 200+1 200+1 500+1 500

    -750-900

    -1 000-1 200-1 200-1 500-1 500

    303540455075

    100

    5060708090

    105120

    23263034385675

    295

    320

    338

    338

    365

    365

    420

    430

    546

    590

    620

    780

    314.325

    358.775

    412.648

    457.098

    457.098

    711.200

    844.550

    315

    230

    248

    340

    270

    340

    310

    350

    400

    480

    454

    570

    239.712

    269.875

    266.700

    254.000

    299.000

    520.700

    615.950

    315

    230

    248

    340

    270

    340

    310

    350

    400

    480

    454

    570

    239.712

    269.875

    266.700

    254.000

    299.000

    520.700

    615.950

    0.093~0.106

    0.099~0.115

    0.104~0.118

    0.107~0.123

    0.113~0.129

    0.115~0.131

    0.131~0.147

    0.136~0.154

    0.173~0.188

    0.188~0.204

    0.195~0.211

    0.244~0.259

    0.098~0.111

    0.111~0.127

    0.130~0.150

    0.136~0.158

    0.143~0.163

    0.206~0.226

    0.266~0.282

    0.420~0.480

    0.360~0.420

    0.450~0.510

    0.400~0.460

    0.420~0.480

    0.430~0.490

    0.490~0.550

    0.520~0.590

    0.780~0.850

    0.850~0.920

    0.880~0.950

    1.100~1.170

    0.450~0.510

    0.430~0.490

    0.450~0.520

    0.430~0.500

    0.500~0.570

    0.730~0.800

    1.200~1.270

    1

    1

    1

    1

    1

    1

    1

    1

    1.5

    1.5

    3

    3

    1

    1

    1

    1

    1

    3

    3

    2.5

    2.5

    2.5

    2.5

    2.5

    2.5

    2.5

    2.5

    2.5

    2.5

    2.5

    2.5

    2.5

    2.5

    2.5

    2.5

    2.5

    2.5

    2.5

    Bearingnumbers

    Boundary dimensions Standardradial clearance

    (approx.)mm

    mm mm

    (1) Inner rings

    mm Δdmp Vdp Vdmpd

    over incl. high lowΔB2s, ΔC2s

    high lowmax maxKiamax

    d D B C r1s min

    1 880

    1 870

    2 320

    2 960

    2 760

    3 340

    3 600

    4 020

    5 520

    6 600

    7 600

    13 400

    2 240

    2 760

    2 800

    2 820

    3 500

    10 000

    13 900

    4 650

    3 700

    4 600

    6 850

    5 300

    7 450

    7 650

    8 900

    13 300

    16 200

    16 700

    29 400

    4 350

    5 700

    5 850

    5 950

    8 150

    23 900

    33 000

    192 000

    190 000

    236 000

    302 000

    280 000

    340 000

    366 000

    410 000

    562 000

    670 000

    780 000

    1 370 000

    228 000

    282 000

    286 000

    288 000

    356 000

    1 020 000

    1 420 000

    475 000

    375 000

    470 000

    700 000

    540 000

    760 000

    780 000

    910 000

    1 350 000

    1 650 000

    1 700 000

    3 000 000

    440 000

    580 000

    600 000

    605 000

    830 000

    2 440 000

    3 350 000

    235

    241

    259

    257

    272

    275

    318

    329

    434

    462

    473

    581

    240

    274

    323

    360

    364

    542

    638

    267

    294

    309

    299

    333

    327

    382

    388

    504

    540

    570

    710

    290

    328

    379

    423

    423

    642

    770

    0.33

    0.41

    0.35

    0.40

    0.40

    0.40

    0.40

    0.39

    0.33

    0.33

    0.33

    0.33

    0.33

    0.39

    0.43

    0.47

    0.43

    0.42

    0.33

    2.03

    1.64

    1.95

    1.68

    1.68

    1.68

    1.68

    1.72

    2.03

    2.03

    2.03

    2.03

    2.07

    1.74

    1.56

    1.43

    1.57

    1.60

    2.03

    Axial load factorConstantAbutment andfillet dimensions

    eda Da Y1

    3.02

    2.44

    2.90

    2.50

    2.50

    2.50

    2.50

    2.56

    3.02

    3.02

    3.02

    3.02

    3.09

    2.59

    2.32

    2.12

    2.34

    2.38

    3.02

    Y2

    1.98

    1.6

    1.91

    1.64

    1.64

    1.64

    1.64

    1.68

    1.98

    1.98

    1.98

    1.98

    2.03

    1.70

    1.52

    1.40

    1.53

    1.56

    1.98

    Y0

    1 Y1 0.67 Y2

    FaFr

    X Y X Y

    ≦eFaFr>e

    Equivalent radial loaddynamicPr=XFr+YFa

    staticPor=Fr+YoFa For values of e, Y1, Y2 and Yosee the table below.

    Dimension Table (For information about bearing models not listed in the Dimension Table, contact NTN Engineering.)

    Metric series Tolerances [JIS 0 Class] Inch series Tolerances [ABMA 0 Class]

    Standard Prelubricating Grease

    Fit (recommended)

    Materials

    Bearing Number

    Chamfer Dimension

    Operating Temperature Range

    ● Brand: Kyodo Yushi Palmax RBG (L373) ● Fill amount: Space volume ratio 35%

    ● Metric series: Shaft d6/ Housing G7 ● Inch series: Contact NTN Engineering for technical assistance.

    Limiting Speed

    ●dm・N≦30×104

      dm:bearing center diameter (mm)=(d+D) /2   d:bearing bore diameter (mm)   D:bearing outside diameter (mm)   N:running speed (min-1)

    ● Inner and outer rings: Case hardening steel ● Rolling element: Bearing steel ※ mark only: Case hardening steel

    The values above are shown as a guide, and may not bemet under certain operating conditions.For details, contact NTN Engineering.

    Features

    ● -20 to +120˚C(A-) CROU- 6001 LLA1X PX1

    Accuracy codeSeal code

    Bearing bore number + added numberBearing type (ULTAGE Series four row tapered roller bearing)

    Optional (special heat treatment 1) )

    NOTE 1) Carbonitriding

    76.2266.7304.8609.6

    266.7304.8609.6914.4

    0000

    +25+25+51+76

    (1) Inner rings

    Δds

    over incl. high low

    (3) Radial deflection of inner and outer rings

    266.7304.8609.6

    304.8609.6914.4

    +25+51+76

    000

    (2) Outer rings

    over incl. high low

    266.7304.8609.6

    304.8609.6914.4

    515176

    Kia, Kea

    Radial runout

    over incl.

    180250315400500630800

    250315400500630800

    1 000

    0000000

    -30-35-40-45-50-75

    -100

    303540455075

    100

    50607080

    100120140

    23263034385675

    (2) Outer rings

    mmD

    over incl. high low max max max

    max

    (4) Combination width deviation of 4-row bearings

    101.6304.8304.8609.6

    304.8609.6609.6―

    over incl.

    ―508.0

    508.0―

    +1 520+1 520+1 520+1 520

    -1 520-1 520-1 520-1 520

    over incl. high low

    1. High load capacity design —the world’s highest level Maximum size and number of rollers help realize high load capacity and longer life.

    2. High load resisting design —the world’s highest level Assurance of uniform contact pressure on rolling elements within bearings and against outside loads has helped greatly enhance load resistance performance.

    3. Compact high sealing design “High sealing” fluoro-rubber seals, boasting a minimized seal volume, are adopted as standard. Through optimization of the tightening force of the main lip and the provision of a shielding arrangement against foreign substances, the water intrusion volume has been reduced by more than 50%: at the same time, the sub lip helps prevent the outflow of grease.

    4. Long-life grease as standard The bearing is prefilled with long-life grease. A rinsing and/or grease prefilling procedure is not necessary when the bearing is installed on the side of the machine.

    40%increase

    Loadcapacity

    ®

    1rs min

    1

    2 Standardaxial clearance

    2

    [CROU..LL Type]

    Patent pending

    Patent pending

    1.9 350 ― 1

    Unit : mm

    rs min or

    r1s min over incl.

    rs max or r1s max

    2.83.5

    3.54

    120250

    250― 1.5

    44.5

    5.56

    120250

    250―

    2.5

    4.555.5

    6.577.5

    120250400

    250400―

    3

    kN kgfC0r C0rCr Cr

    mm

    φD φd φda φDa

    B

    r1

    r

    C

    ●Design that maximizes load capacity —rollers (size and number) as wells as the cage. ●Newly developed crowning

    helps improve load resistance performance.

    Conventional design

    Conventional design

    ULTAGE design

    ULTAGE design

    Critical contact pressure

    Axial position on roller

    O-ring O-ring

    Main lip Sub lip

    Main lip(w/ shielding mechanism)

    Fluoro-rubber seal

    Shieldingmechanism

    New crowning designis adopted for rollingelements.

    Conventional crowning

    Unit : μm

    Unit : μmUnit : μm

    Unit : μm

    Unit : μm

    Unit : μmSealed Four Row Tapered Roller Bearingsfor Rolling Mill Roll-NecksThe ULTAGE series sealed four row tapered roller bearings (CROU..LL type) are new standard series productsespecially developed to satisfy the “high load capacity”, “high load resistance performance” and “high sealingperformance” required for steel mill roll-neck applications and to improve reliability through long life design.

    The ULTAGE series sealed four row tapered roller bearings (CROU..LL type) are new standard series productsespecially developed to satisfy the “high load capacity”, “high load resistance performance” and “high sealingperformance” required for steel mill roll-neck applications and to improve reliability through long life design.

    • Compact seal design helpsmaximize bearing side volume.• Maximization in the size andnumber of rollers helps realize

    high load capacity.

    • Newly developed crowninghelps reduce and ensureuniform contact pressure.• World’s highest level in

    load resistanceperformance.

    • Newly developed seal lipdesign significantly reduces

    water intrusion volume.• Fluoro-rubber seal boasts

    more positive sealingperformance.

    Twice asgreat

    Loadresistance

    Sealingperformance50%

    reduction in waterintrusion volume

    Compact sealcase design

    Seals with improvedwater intrusionperformance

    Phosphatecoatingon the entiresurface

    High loadcapacity design

    High loadresistance design

    "ULTAGE " (a name created from the combination of "ultimate," signifying refinement,and "stage," signifying NTN's intentionthat this series of products be employed in diverse applications) is the general name for NTN's new generation of bearings thatare noted for their industry-leading performance.

    ®

    ®

    Newly developed crowning

    Contact pressurereduced by halfC

    onta

    ct p

    ress

    ure

    Excessively highcontact pressure

    Side face of innerring or centerwasher, or side faceof outer ring

    Bore diameter face of bearing or outer diameter face ofbearing (Axial direction)

    rs min or r1s min (Rad

    ial d

    irect

    ion)

    rs max or r1s max

    rs m

    in o

    r r1

    s m

    in

    rs m

    ax o

    r r1

    s m

    ax

    rs min or r1s min

    Nominalbore diameter

    d

    Radialdirection

    Axialdirection

    Ser

    ies

    Met

    ric

    seri

    esIn

    ch s

    erie

    s

    Basic load ratingsdynamic static dynamic static

    1 Minimum allowable value of chamfer dimension r. 2 Depending on operating conditions, appropriate values may vary. Contact NTN Engineering for technical assistance.

    ULTAGE Sealed Four Row Tapered Roller Bearings for Rolling Mill Roll-Necks [CROU..LL Type]

    Nominal borediameter

    mmd

    Nominal borediameter

    mmd

    Nominal borediameter

    Single borediameter deviation

    ΔDs

    Single outsidediameter deviation

    Nominal outsidediameter

    mmD

    Nominal outsidediameter

    mmD

    Nominal outsidediameter

    mmD

    Nominal outsidediameter

    Inner ringradial runout

    Inner ringradial runout

    Combination width deviation of

    4-row bearings

    ΔB2s, ΔC2s

    Combination width deviation of

    4-row bearings

    Dimensional toleranceof mean bore

    diamteter within plane

    Dimensional toleranceof mean outside

    diamteter within plane

    Borediametervariation

    Outsidediametervariation

    Mean borediametervariation

    Mean outsidediametervariation

    ΔDmp VDp VDmp Kea

  • CROU-4401LLA1X

    CROU-4501LLA1X

    CROU-4801LLA1X

    CROU-4802LLA1X

    CROU-5001LLA1X

    CROU-5201LLA1X

    CROU-6001LLA1X

    CROU-6201LLA1X

    CROU-8201LLA1X

    CROU-8801LLA1X

    CROU-8802LLA1X

    CROU-10601LLA1X※

    CROU-4402LLA1X

    CROU-5101LLA1X

    CROU-6101LLA1X

    CROU-6901LLA1X

    CROU-6902LLA1X

    CROU-10001LLA1X※

    CROU-11901LLA1X

    220

    225

    240

    240

    250

    260

    300

    310

    410

    440

    440

    530

    220.662

    254.000

    304.902

    343.052

    343.052

    501.650

    595.312

    180250315400500630800

    250315400500630800

    1 000

    0000000

    -30-35-40-45-50-75

    -100

    +750+900

    +1 000+1 200+1 200+1 500+1 500

    -750-900

    -1 000-1 200-1 200-1 500-1 500

    303540455075

    100

    5060708090

    105120

    23263034385675

    295

    320

    338

    338

    365

    365

    420

    430

    546

    590

    620

    780

    314.325

    358.775

    412.648

    457.098

    457.098

    711.200

    844.550

    315

    230

    248

    340

    270

    340

    310

    350

    400

    480

    454

    570

    239.712

    269.875

    266.700

    254.000

    299.000

    520.700

    615.950

    315

    230

    248

    340

    270

    340

    310

    350

    400

    480

    454

    570

    239.712

    269.875

    266.700

    254.000

    299.000

    520.700

    615.950

    0.093~0.106

    0.099~0.115

    0.104~0.118

    0.107~0.123

    0.113~0.129

    0.115~0.131

    0.131~0.147

    0.136~0.154

    0.173~0.188

    0.188~0.204

    0.195~0.211

    0.244~0.259

    0.098~0.111

    0.111~0.127

    0.130~0.150

    0.136~0.158

    0.143~0.163

    0.206~0.226

    0.266~0.282

    0.420~0.480

    0.360~0.420

    0.450~0.510

    0.400~0.460

    0.420~0.480

    0.430~0.490

    0.490~0.550

    0.520~0.590

    0.780~0.850

    0.850~0.920

    0.880~0.950

    1.100~1.170

    0.450~0.510

    0.430~0.490

    0.450~0.520

    0.430~0.500

    0.500~0.570

    0.730~0.800

    1.200~1.270

    1

    1

    1

    1

    1

    1

    1

    1

    1.5

    1.5

    3

    3

    1

    1

    1

    1

    1

    3

    3

    2.5

    2.5

    2.5

    2.5

    2.5

    2.5

    2.5

    2.5

    2.5

    2.5

    2.5

    2.5

    2.5

    2.5

    2.5

    2.5

    2.5

    2.5

    2.5

    Bearingnumbers

    Boundary dimensions Standardradial clearance

    (approx.)mm

    mm mm

    (1) Inner rings

    mm Δdmp Vdp Vdmpd

    over incl. high lowΔB2s, ΔC2s

    high lowmax maxKiamax

    d D B C r1s min

    1 880

    1 870

    2 320

    2 960

    2 760

    3 340

    3 600

    4 020

    5 520

    6 600

    7 600

    13 400

    2 240

    2 760

    2 800

    2 820

    3 500

    10 000

    13 900

    4 650

    3 700

    4 600

    6 850

    5 300

    7 450

    7 650

    8 900

    13 300

    16 200

    16 700

    29 400

    4 350

    5 700

    5 850

    5 950

    8 150

    23 900

    33 000

    192 000

    190 000

    236 000

    302 000

    280 000

    340 000

    366 000

    410 000

    562 000

    670 000

    780 000

    1 370 000

    228 000

    282 000

    286 000

    288 000

    356 000

    1 020 000

    1 420 000

    475 000

    375 000

    470 000

    700 000

    540 000

    760 000

    780 000

    910 000

    1 350 000

    1 650 000

    1 700 000

    3 000 000

    440 000

    580 000

    600 000

    605 000

    830 000

    2 440 000

    3 350 000

    235

    241

    259

    257

    272

    275

    318

    329

    434

    462

    473

    581

    240

    274

    323

    360

    364

    542

    638

    267

    294

    309

    299

    333

    327

    382

    388

    504

    540

    570

    710

    290

    328

    379

    423

    423

    642

    770

    0.33

    0.41

    0.35

    0.40

    0.40

    0.40

    0.40

    0.39

    0.33

    0.33

    0.33

    0.33

    0.33

    0.39

    0.43

    0.47

    0.43

    0.42

    0.33

    2.03

    1.64

    1.95

    1.68

    1.68

    1.68

    1.68

    1.72

    2.03

    2.03

    2.03

    2.03

    2.07

    1.74

    1.56

    1.43

    1.57

    1.60

    2.03

    Axial load factorConstantAbutment andfillet dimensions

    eda Da Y1

    3.02

    2.44

    2.90

    2.50

    2.50

    2.50

    2.50

    2.56

    3.02

    3.02

    3.02

    3.02

    3.09

    2.59

    2.32

    2.12

    2.34

    2.38

    3.02

    Y2

    1.98

    1.6

    1.91

    1.64

    1.64

    1.64

    1.64

    1.68

    1.98

    1.98

    1.98

    1.98

    2.03

    1.70

    1.52

    1.40

    1.53

    1.56

    1.98

    Y0

    1 Y1 0.67 Y2

    FaFr

    X Y X Y

    ≦eFaFr>e

    Equivalent radial loaddynamicPr=XFr+YFa

    staticPor=Fr+YoFa For values of e, Y1, Y2 and Yosee the table below.

    Dimension Table (For information about bearing models not listed in the Dimension Table, contact NTN Engineering.)

    Metric series Tolerances [JIS 0 Class] Inch series Tolerances [ABMA 0 Class]

    Standard Prelubricating Grease

    Fit (recommended)

    Materials

    Bearing Number

    Chamfer Dimension

    Operating Temperature Range

    ● Brand: Kyodo Yushi Palmax RBG (L373) ● Fill amount: Space volume ratio 35%

    ● Metric series: Shaft d6/ Housing G7 ● Inch series: Contact NTN Engineering for technical assistance.

    Limiting Speed

    ●dm・N≦30×104

      dm:bearing center diameter (mm)=(d+D) /2   d:bearing bore diameter (mm)   D:bearing outside diameter (mm)   N:running speed (min-1)

    ● Inner and outer rings: Case hardening steel ● Rolling element: Bearing steel ※ mark only: Case hardening steel

    The values above are shown as a guide, and may not bemet under certain operating conditions.For details, contact NTN Engineering.

    Features

    ● -20 to +120˚C(A-) CROU- 6001 LLA1X PX1

    Accuracy codeSeal code

    Bearing bore number + added numberBearing type (ULTAGE Series four row tapered roller bearing)

    Optional (special heat treatment 1) )

    NOTE 1) Carbonitriding

    76.2266.7304.8609.6

    266.7304.8609.6914.4

    0000

    +25+25+51+76

    (1) Inner rings

    Δds

    over incl. high low

    (3) Radial deflection of inner and outer rings

    266.7304.8609.6

    304.8609.6914.4

    +25+51+76

    000

    (2) Outer rings

    over incl. high low

    266.7304.8609.6

    304.8609.6914.4

    515176

    Kia, Kea

    Radial runout

    over incl.

    180250315400500630800

    250315400500630800

    1 000

    0000000

    -30-35-40-45-50-75

    -100

    303540455075

    100

    50607080

    100120140

    23263034385675

    (2) Outer rings

    mmD

    over incl. high low max max max

    max

    (4) Combination width deviation of 4-row bearings

    101.6304.8304.8609.6

    304.8609.6609.6―

    over incl.

    ―508.0

    508.0―

    +1 520+1 520+1 520+1 520

    -1 520-1 520-1 520-1 520

    over incl. high low

    1. High load capacity design —the world’s highest level Maximum size and number of rollers help realize high load capacity and longer life.

    2. High load resisting design —the world’s highest level Assurance of uniform contact pressure on rolling elements within bearings and against outside loads has helped greatly enhance load resistance performance.

    3. Compact high sealing design “High sealing” fluoro-rubber seals, boasting a minimized seal volume, are adopted as standard. Through optimization of the tightening force of the main lip and the provision of a shielding arrangement against foreign substances, the water intrusion volume has been reduced by more than 50%: at the same time, the sub lip helps prevent the outflow of grease.

    4. Long-life grease as standard The bearing is prefilled with long-life grease. A rinsing and/or grease prefilling procedure is not necessary when the bearing is installed on the side of the machine.

    40%increase

    Loadcapacity

    ®

    1rs min

    1

    2 Standardaxial clearance

    2

    [CROU..LL Type]

    Patent pending

    Patent pending

    1.9 350 ― 1

    Unit : mm

    rs min or

    r1s min over incl.

    rs max or r1s max

    2.83.5

    3.54

    120250

    250― 1.5

    44.5

    5.56

    120250

    250―

    2.5

    4.555.5

    6.577.5

    120250400

    250400―

    3

    kN kgfC0r C0rCr Cr

    mm

    φD φd φda φDa

    B

    r1

    r

    C

    ●Design that maximizes load capacity —rollers (size and number) as wells as the cage. ●Newly developed crowning

    helps improve load resistance performance.

    Conventional design

    Conventional design

    ULTAGE design

    ULTAGE design

    Critical contact pressure

    Axial position on roller

    O-ring O-ring

    Main lip Sub lip

    Main lip(w/ shielding mechanism)

    Fluoro-rubber seal

    Shieldingmechanism

    New crowning designis adopted for rollingelements.

    Conventional crowning

    Unit : μm

    Unit : μmUnit : μm

    Unit : μm

    Unit : μm

    Unit : μmSealed Four Row Tapered Roller Bearingsfor Rolling Mill Roll-NecksThe ULTAGE series sealed four row tapered roller bearings (CROU..LL type) are new standard series productsespecially developed to satisfy the “high load capacity”, “high load resistance performance” and “high sealingperformance” required for steel mill roll-neck applications and to improve reliability through long life design.

    The ULTAGE series sealed four row tapered roller bearings (CROU..LL type) are new standard series productsespecially developed to satisfy the “high load capacity”, “high load resistance performance” and “high sealingperformance” required for steel mill roll-neck applications and to improve reliability through long life design.

    • Compact seal design helpsmaximize bearing side volume.• Maximization in the size andnumber of rollers helps realize

    high load capacity.

    • Newly developed crowninghelps reduce and ensureuniform contact pressure.• World’s highest level in

    load resistanceperformance.

    • Newly developed seal lipdesign significantly reduces

    water intrusion volume.• Fluoro-rubber seal boasts

    more positive sealingperformance.

    Twice asgreat

    Loadresistance

    Sealingperformance50%

    reduction in waterintrusion volume

    Compact sealcase design

    Seals with improvedwater intrusionperformance

    Phosphatecoatingon the entiresurface

    High loadcapacity design

    High loadresistance design

    "ULTAGE " (a name created from the combination of "ultimate," signifying refinement,and "stage," signifying NTN's intentionthat this series of products be employed in diverse applications) is the general name for NTN's new generation of bearings thatare noted for their industry-leading performance.

    ®

    ®

    Newly developed crowning

    Contact pressurereduced by halfC

    onta

    ct p

    ress

    ure

    Excessively highcontact pressure

    Side face of innerring or centerwasher, or side faceof outer ring

    Bore diameter face of bearing or outer diameter face ofbearing (Axial direction)

    rs min or r1s min (Rad

    ial d

    irect

    ion)

    rs max or r1s max

    rs m

    in o

    r r1

    s m

    in

    rs m

    ax o

    r r1

    s m

    ax

    rs min or r1s min

    Nominalbore diameter

    d

    Radialdirection

    Axialdirection

    Ser

    ies

    Met

    ric

    seri

    esIn

    ch s

    erie

    s

    Basic load ratingsdynamic static dynamic static

    1 Minimum allowable value of chamfer dimension r. 2 Depending on operating conditions, appropriate values may vary. Contact NTN Engineering for technical assistance.

    ULTAGE Sealed Four Row Tapered Roller Bearings for Rolling Mill Roll-Necks [CROU..LL Type]

    Nominal borediameter

    mmd

    Nominal borediameter

    mmd

    Nominal borediameter

    Single borediameter deviation

    ΔDs

    Single outsidediameter deviation

    Nominal outsidediameter

    mmD

    Nominal outsidediameter

    mmD

    Nominal outsidediameter

    mmD

    Nominal outsidediameter

    Inner ringradial runout

    Inner ringradial runout

    Combination width deviation of

    4-row bearings

    ΔB2s, ΔC2s

    Combination width deviation of

    4-row bearings

    Dimensional toleranceof mean bore

    diamteter within plane

    Dimensional toleranceof mean outside

    diamteter within plane

    Borediametervariation

    Outsidediametervariation

    Mean borediametervariation

    Mean outsidediametervariation

    ΔDmp VDp VDmp Kea

  • Performance Test Data

    ULTAGE Sealed Four Row Tapered Roller Bearings for Rolling Mill Roll-Necks [CROU..LL Type]

    ●Water Resistance Durability Test

    [Test conditions] Bearing number: ULTAGE sealed four row tapered roller bearing CROU-6001LLAX1 (Dimensions:φ300×φ420×310, Cr: 3600 kN, C0r: 7650 kN) Prelubricating grease: Palmax RBG Radial load: 390 kN (0.11 Cr) Running speed: Cyclic operation where one cycle consists of ⇒300 min-1 (0.5 h) ⇒ 500 min-1 (1 h) ⇒ standstill (1 h) Water spray: 0.15 L/min Total running hours: 1000 h

    ●Life test result

    [Test conditions] Bearing number: Comparison of conventional design and ULTAGE in terms of life 30316U (dimensions:φ80×φ170×42.5) Lubrication: Turbine Oil VG68, circulating lubrication Combined radial and axial loads: 117 kN/bearing (0.4 Cr equivalent, radial load: 75 kN/bearing, axial load: 50 kN/bearing) Running speed: 2000 min-1

    Misalignment: 1/600 (0.1˚)

    Structure of test rig

    Appearance of test rig

    Rollers on side A Outer ring on side B Outer ring on side C Outer ring on side DRollers on side D

    0.03% 0.02% 0.02% 0.03% 0.02%

    0.27% 0.03% 2.01% 0.03% 0.04%

    Appearance ofassembled inner ring

    Appearance ofouter ring

    Flaking

    Flaking

    No damage

    No damage

    Status

    Structure of test rig

    ULTAGE bearings boast a life 2.6 times as long as their design life, and twice as long as the life of conventionalbearings, when both bearing types are tested under test conditions of 0.4 Cr and 1/600 misalignment.

    A B C D

    Load

    Test bearing

    Test bearing 2Test bearing 1

    Waterspray

    Fr

    Fa

    Flaking occurred nearthe chamfered end ofrollers as well as at thecorresponding contactpoint on the outer ring.(L10 = 225 h)

    After termination of thetest at 690 hours, thetest bearing was freefrom any failuresincluding flaking.

    [Test result]

    Conventional designL10 life 225 h(n = 6)

    CalculatedL10 life173 h

    ULTAGE designMinimum L10 life 450 h(n = 6)

    99

    80

    50

    20

    10

    5

    1101 102 103 104

    Cum

    ulat

    ive

    frac

    ture

    pro

    babi

    lity

    (%)

    Life (h)

    [Status of bearing interior after test, and water content in grease (wt%)]* Water content in factory-fresh grease is in the range of 0.001% to 0.04%.

    Con

    vent

    iona

    lse

    alH

    igh

    sea

    ling

    seal

    Evidence of water intrusion is found on the conventional seal. In contrast, the NTN “high sealing”seal does not exhibit evidence of water intrusion.

    Con

    vent

    iona

    lde

    sign

    ULT

    AG

    E

    HEADQUARTERSNTN Corporation URL http://www.ntn.co.jp1-3-17, Kyomachibori, Nishi-ku, Osaka-shi, Osaka 550-0003 Japan

    Phone: +81-6-6443-5001

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    SALES NETWORKNTN Bearing Corp. of AmericaHead Office / 1600 E. Bishop Court, P.O. Box 7604, Mount Prospect, IL 60056-7604, U.S.A. Phone: +1-847-298-7500 Fax: +1-847-699-9744Central Sales Office / 2413 North Main Street, East Peoria, Illinois 61611 Phone: +1-309-699-8600 Fax: +1-309-699-8670NTN Automotive Center / 39255 W. 12 Mile Road, Farmington Hills, MI 48331-2975, U.S.A. Phone: +1-248-324-4700 Fax: +1-248-324-1103

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    NTN Korea Co., Ltd.Head Office / 10th Floor, Press Center, 25, Taepyeong-Ro 1-GA, Jung-Gu, Seoul 100-745, Korea Phone: +82-2-720-3665 Fax: +82-2-720-3669Busan Branch / Rm.707, 7th Floor, Daerim Bldg., 341-5 Bujeon 1-Dong, Busanjin- Gu, Busan, Korea, 614-843 Phone: +82-51-811-1351 Fax: +82-51-811-1353

    NOTE : The appearance and specifications may be changed without prior notice if required to improve performance. Although care has been taken to assure the accuracy of the data compiled in this catalog, NTN does not assume any liability to any company or person for errors or omissions.

    AE72 CAT. No. 3801/E 12. 03. 06. NPrinted in Japan

    Sealed Four Row Tapered Roller Bearingsfor Rolling Mill Roll-Necks

    [CROU..LL Type]

    CAT. No. 3801/E