Advanced Product Solutions
Four-Row Cylindrical
Roller Bearings
NSK four-row cylindrical bearings are engineered specifically to accommodate the extremely heavy and impact loads – while running smoothly and accurately – in the back-up rolls of rolling mill stands. Amid particularly harsh operating conditions, NSK’s long-life Super-TF steel provides significantly higher durability to counteract the heavy rolling load and the high probability of compromised bearing lubrication due to contamination.
Available in a large range of design types with high-performance cage options, and manufactured to precision tolerances, NSK four-row cylindrical bearings are optimized to deliver high capacity and high accuracy for uninterrupted and precise plate making.
Proven Benefits
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Exceptionally high load carrying capacity from four-row design, optimized in machined steel cage designs with larger rollers |
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Suitable for high and low speeds, accommodating rapid acceleration and deceleration |
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Higher reliability and longer operating life with Super-TF steel, reducing bearing replacement and maintenance intervals |
Design Features
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Special design high load capacity four-row cylindrical roller bearing |
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With long-life Super-TF steel for dramatically longer service life under contaminated operating conditions |
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Wide range of design configurations with one- and two-piece inner or outer rings, integral outer ring ribs, outer ring spacers and outer flange rings |
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With cylindrical and tapered bores |
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Available with machined brass or machined steel cage designs |
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Corrosion resistant phosphate coating option for designated surfaces |
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With outer ring lubrication groove and hole features |
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With precision tolerances for high rotational accuracy |
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With special, custom, C3 or C4 radial clearance |
Designation System
Bearing Dimensions and Operating Values
| BASIC BEARING NO. | BEARING DIMENSIONS | BASIC LOAD RATINGS | |||||
| mm | kN | ||||||
| d | D | B | C2 | Fw | Dynamic | Static | |
| STF127RV1722g | 127 | 174.625 | 150.812 | 150.812 | 139.5 | 735 | 1 580 |
| STF145RV2101g | 145 | 210 | 155 | 155 | 165.93 | 770 | 1 850 |
| STF145RV2201g | 225 | 156 | 156 | 169 | 975 | 1 820 | |
| STF160RV2302g | 160 | 230 | 168 | 168 | 180 | 895 | 2 200 |
| STF160RV2306g | 230 | 130 | 130 | 180 | 785 | 1 460 | |
| STF160RV2403g | 240 | 145 | 145 | 180.073 | 920 | 1 600 | |
| STF165RV2221g | 165.1 | 225.45 | 168.3 | 168.3 | 180.975 | 1 010 | 2 220 |
| STF170RV2321g | 170 | 230 | 160 | 160 | 185.5 | 1 150 | 2 060 |
| STF170RV2405g | 240 | 130 | 130 | 190 | 895 | 1 760 | |
| STF180RV2601g | 180 | 260 | 168 | 168 | 202 | 1 150 | 2 300 |
| STF180RV2802g | 280 | 180 | 180 | 205.085 | 1 410 | 2 490 | |
| STF190RV2701g | 190 | 270 | 200 | 200 | 212 | 1 470 | 3 100 |
| STF190RV2801g | 280 | 200 | 200 | 214 | 1 480 | 2 920 | |
| STF200RV2702g | 200 | 270 | 170 | 170 | 222 | 1 120 | 2 590 |
| STF200RV2804g | 280 | 170 | 170 | 222 | 1 370 | 2 960 | |
| STF200RV2802g | 280 | 200 | 200 | 222 | 1 410 | 3 200 | |
| STF200RV2901g | 290 | 192 | 192 | 226 | 1 420 | 3 000 | |
| STF210RV2901g | 210 | 290 | 192 | 192 | 236 | 1 400 | 3 350 |
| STF220RV3101g | 220 | 310 | 192 | 192 | 247 | 1 540 | 3 450 |
| STF230RV3301g | 230 | 330 | 206 | 206 | 260 | 1 760 | 3 900 |
| STF240RV3603g | 240 | 360 | 218 | 218 | 270.085 | 2 110 | 4 000 |
| STF260RV3701g | 260 | 370 | 220 | 220 | 292 | 2 050 | 4 450 |
| STF280RV3901g | 280 | 390 | 220 | 220 | 312 | 2 120 | 4 800 |
| STF280RV3907g | 390 | 220 | 220 | 312 | 2 280 | 5 100 | |
| STF320RV4621g | 320 | 460 | 240 | 240 | 364 | 2 820 | 6 100 |
| STF400RV5611g | 400 | 560 | 410 | 410 | 445 | 6 550 | 16 500 |
| STF440RV6215g | 440 | 620 | 450 | 450 | 487 | 8 100 | 19 700 |
| STF460RV6513g | 460 | 650 | 470 | 470 | 509 | 8 600 | 21 200 |
| STF480RV6815g | 480 | 680 | 500 | 500 | 532 | 9 400 | 23 500 |
| STF500RV6713g | 500 | 670 | 450 | 450 | 540 | 7 750 | 20 000 |
| STF500RV7011g | 700 | 500 | 500 | 554 | 9 650 | 24 600 | |
| STF530RV7811g | 530 | 780 | 570 | 570 | 601 | 11 800 | 29 200 |
| STF550RV7413g | 550 | 740 | 510 | 510 | 600 | 10 100 | 27 600 |
| STF560RV8211g | 560 | 820 | 600 | 600 | 625 | 14 100 | 34 000 |
| STF570RV8113g | 570 | 815 | 594 | 594 | 628 | 13 200 | 32 000 |
| STF600RV8212g | 600 | 820 | 575 | 575 | 660 | 12 900 | 35 500 |
| STF650RV9212g | 650 | 920 | 670 | 670 | 723 | 16 200 | 44 000 |
| STF660RV9311g | 660 | 930 | 660 | 660 | 728 | 17 000 | 44 000 |
| STF690RV9813g | 690 | 980 | 750 | 750 | 766 | 19 200 | 53 000 |
| STF730RV1011g | 730 | 1 030 | 750 | 750 | 809 | 20 700 | 56 500 |
| STF761RV1012g | 761.425 | 1 079.6 | 787.4 | 787.4 | 846 | 23 900 | 65 500 |
| STF770RV1011g | 770 | 1 075 | 770 | 770 | 847 | 23 100 | 63 500 |
| STF800RV1013g | 800 | 1 080 | 700 | 700 | 878 | 19 100 | 56 000 |
| STF800RV1014g | 1 080 | 700 | 700 | 878 | 19 200 | 55 000 | |
| STF800RV1012g | 1 080 | 750 | 750 | 880 | 19 300 | 57 000 | |
| STF820RV1119g | 820 | 1 100 | 745 | 720 | 892 | 20 100 | 59 000 |
| STF820RV1112g | 1 130 | 650 | 650 | 891 | 20 300 | 53 000 | |
| STF820RV1110g | 1 130 | 800 | 800 | 903 | 22 900 | 66 500 | |
| STF840RV1111g | 840 | 1 160 | 840 | 840 | 920 | 24 900 | 71 500 |
| STF850RV1115g | 850 | 1 150 | 840 | 840 | 928 | 25 600 | 77 500 |
| STF850RV1111g | 1 180 | 850 | 850 | 940 | 24 700 | 72 500 | |
| STF900RV1216g | 900 | 1 220 | 810 | 800 | 981 | 25 900 | 74 500 |
| STF900RV1212g | 1 220 | 840 | 840 | 989 | 26 800 | 80 000 | |
| STF950RV1314g | 950 | 1 330 | 950 | 950 | 1 053 | 33 500 | 97 000 |
The specification of oil mist fitting and O-rings on outer rings are available when requested.
Additional bearing sizes are available. Please contact NSK for additional information.
