Double Row Ball Slewing Bearings
There are two kinds of double-row ball slewing bearings. One is with different ball diameters used in lightweight applications. The other one is eight-point contact bearings with two same ball raceways. You can think of it as two single-row ball bearings stacked together. Having a higher load capacity, these double-row bearings are more suitable—for heavier duty applications such as tower cranes, truck-mounted cranes, tunnel boring machines, etc.
Double Row Ball Slewing Bearings
The double row ball slewing bearings have two-row steel balls for structure. It has a bigger load capacity than a single row slewing bearing. It has a better safety factor and could simultaneously bear axial load, radial load, and tilting moment. The double row slewing ring has three seat rings. The steel ball and the spacing block can be directly arranged into the upper and lower races, and two rows of upper and lower steel balls with different diameters are fitted according to the stress condition. The double row ball slewing bearing ring’s axial and radial size are relatively large and solid. So it’s applications: diameter tower cranes, truck-mounted cranes, etc. The double row slewing bearing ring is mainly made of 50Mn, 42CrMo, and C45.
Product parameters
(1) Model and size parameters of external gear double-row ball slewing bearing
| Model | Dimensions | Installation Size | Tooth Parameters | Load | Weight | ||||||||||||||
| De | de | di | Di | He | Hi | Ht | Fe | Fi | N | V | L | W | m | Z | x·m | Dp | |||
| [mm] | [mm] | [mm] | [mm] | [mm] | [mm] | [mm] | [mm] | [-] | [mm] | [-] | [mm] | [-] | [mm] | [mm] | [kN] | [kg] | |||
| 2B22-E-0307 | 432 | 309 | 305 | 224 | 83 | 83 | 92 | 360 | 254 | 16 | 17 | 25 | 12 | 6 | 70 | – | 420 | 40.8 | 51 |
| 2B22-E-0383 | 504 | 385 | 381 | 300 | 83 | 83 | 92 | 436 | 330 | 16 | 17 | 25 | 12 | 8 | 61 | – | 488 | 81.6 | 64 |
| 2B25-E-0475 | 595 | 477 | 473 | 382 | 88 | 88 | 98 | 540 | 410 | 24 | 17 | 25 | 14 | 5 | 117 | – | 585 | 34 | 85 |
| 2B25-E-0575 | 712 | 577 | 573 | 470 | 88 | 88 | 98 | 640 | 508 | 24 | 17 | 25 | 9 | 8 | 87 | – | 696 | 81.6 | 123 |
| 2B20-E-0752 | 864 | 754 | 750 | 678 | 83 | 83 | 92 | 800 | 706 | 36 | 17 | 25 | 9 | 6 | 142 | – | 852 | 62 | 114 |
| 2B25-E-0821 | 979 | 823 | 819 | 718 | 92 | 92 | 102 | 893 | 753 | 36 | 21 | 31 | 15 | 10 | 94 | 11 | 940 | 141.2 | 200 |
2B20-E-0968 |
1080 | 970 | 966 | 893 | 83 | 83 | 92 | 1015 | 922 | 30 | 17 | 25 | 10 | 8 | 133 | – | 1064 | 82.6 | 148 |
| 2B25-E-1077 | 1200 | 1079 | 1075 | 976 | 88 | 88 | 98 | 1135 | 1012 | 36 | 19 | – | – | 8 | 148 | – | 1184 | 83.6 | 210 |
| 2B25-E-0980 | 1144 | 982 | 978 | 870 | 96 | 96 | 110 | 1050 | 910 | 36 | 21 | 31 | 12 | 10 | 111 | 8 | 1110 | 170 | 262 |
| 2B28-E-1117 | 1289 | 1120 | 1114 | 985 | 98 | 98 | 108 | 1198 | 1035 | 40 | 21 | 31 | 18 | 10 | 125 | 10.5 | 1250 | 160.4 | 332 |
| 2B28-E-1215 | 1380 | 1218 | 1212 | 1095 | 98 | 98 | 108 | 1290 | 1135 | 36 | 23 | 34 | 16 | 10 | 136 | – | 1360 | 144 | 334 |
| 2B30-E-1249 | 1476 | 1252 | 1246 | 1085 | 101 | 101 | 110 | 1350 | 1150 | 48 | 26 | 37 | 23 | 10 | 144 | 8.6 | 1440 | 172 | 502 |
| 2B35-E-1249 | 1472 | 1252 | 1246 | 1085 | 134 | 134 | 144 | 1350 | 1150 | 36 | 28 | 41 | 27 | 14 | 102 | 9.1 | 1428 | 295.6 | 640 |
| 2B30-E-1391 | 1603 | 1394 | 1388 | 1208 | 110 | 110 | 120 | 1500 | 1280 | 40 | 29 | – | – | 10 | 157 | 7.5 | 1570 | 202 | 636 |
| 2B35-E-1402 | 1604 | 1405 | 1399 | 1208 | 134 | 134 | 144 | 1500 | 1280 | 48 | 31 | 46 | 28 | 10 | 157 | 7 | 1570 | 295.6 | 710 |
| 2B35-E-1390 | 1634 | 1393 | 1387 | 1208 | 138 | 134 | 148 | 1500 | 1280 | 48 | 31 | 46 | 24 | 14 | 113 | 14 | 1582 | 354.6 | 800 |
| 2B35-E-1578 | 1805 | 1581 | 1575 | 1433 | 140 | 140 | 156 | 1671 | 1485 | 60 | 28 | 41 | 15 | 16 | 109 | 16.9 | 1744 | 411.2 | 810 |
(2) Internal gear double-row ball slewing bearing model size parameters

| Model | Dimensions | Installation Size | Tooth Parameters | Load | Weight | ||||||||||||||
| De | de | di | Di | He | Hi | Ht | Fe | Fi | N | V | L | W | m | Z | x·m | Dp | |||
| [mm] | [mm] | [mm] | [mm] | [mm] | [mm] | [mm] | [mm] | [-] | [mm] | [-] | [mm] | [-] | [mm] | [mm] | [kN] | [kg] | |||
| 2B22-I-0625 | 705 | 627 | 623 | 504 | 83 | 83 | 92 | 675 | 575 | 32 | 17 | 25 | 9 | 8 | 65 | – | 520 | 98.6 | 95 |
| 2B22-I-0763 | 850 | 765 | 761 | 641 | 83 | 83 | 92 | 820 | 705 | 36 | 17 | 25 | 17 | 8 | 81 | -4 | 648 | 128.4 | 128 |
| 2B20-I-0897 | 973 | 899 | 895 | 786 | 88 | 88 | 97 | 944 | 850 | 36 | 17 | 25 | 11 | 8 | 100 | – | 800 | 90.6 | 141 |
| 2B22-I-0885 | 982 | 887 | 883 | 754 | 88 | 88 | 97 | 944 | 826 | 36 | 21 | 31 | 14 | 8 | 95 | -4 | 760 | 123.6 | 170 |
| 2B25-I-0972 | 1074 | 974 | 970 | 820 | 100 | 96 | 114 | 1035 | 910 | 40 | 21 | – | – | 10 | 84 | – | 840 | 152 | 234 |
| 2B22-I-1088 | 1172 | 1090 | 1085 | 962 | 88 | 88 | 97 | 1134 | 1040 | 36 | 17 | 25 | 11 | 10 | 98 | – | 980 | 113.4 | 193 |
| 2B25-I-1103 | 1200 | 1105 | 1099 | 963 | 96 | 96 | 110 | 1160 | 1040 | 36 | 21 | 31 | 12 | 10 | 98 | – | 980 | 124.6 | 239 |
| 2B30-I-1143 | 1250 | 1147 | 1141 | 998 | 99.5 | 99.5 | 110 | 1208 | 1080 | 36 | 21 | 31 | 12 | 10 | 100 | -8 | 1000 | 182.6 | 276 |
2B28-I-1222 |
1345 | 1225 | 1219 | 1061.6 | 98 | 98 | 108 | 1290 | 1150 | 40 | 21 | 31 | 16 | 10 | 108 | – | 1080 | 146.6 | 331 |
| 2B30-I-1351 | 1470 | 1354 | 1348 | 1179 | 98 | 98 | 108 | 1425 | 1270 | 48 | 23 | 34 | 18 | 12 | 100 | – | 1200 | 171 | 365 |
| 2B40-I-1386 | 1530 | 1389 | 1383 | 1186 | 134 | 134 | 144 | 1480 | 1290 | 48 | 25 | 37 | 23 | 12 | 100 | – | 1200 | 226 | 627 |
| 2B30-I-1613 | 1750 | 1616 | 1610 | 1418.4 | 110 | 105 | 120 | 1705 | 1525 | 48 | 25 | 37 | 23 | 12 | 120 | – | 1440 | 186.2 | 564 |
| 2B45-I-1605 | 1780 | 1606 | 1602 | 1375 | 134 | 134 | 144 | 1710 | 1500 | 48 | 31 | 46 | 28 | 14 | 100 | – | 1400 | 274.8 | 840 |
| 2B35-I-1935 | 2100 | 1938 | 1932 | 1719 | 134 | 134 | 144 | 2035 | 1835 | 72 | 29 | – | – | 12 | 145 | – | 1740 | 228 | 965 |
| 2B35-I-2003 | 2178 | 2006 | 2000 | 1779 | 134 | 134 | 144 | 2108 | 1898 | 72 | 29 | – | – | 12 | 150 | – | 1800 | 228 | 1062 |
Features of double row ball slewing bearing
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For mid-to-heavy load applications
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Suitable for vibration conditions
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Require less demanding mounting structure
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Provide a high load for a restricted installation space
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Available in gearless, internally geared, and externally gear versions
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Available in induction hardened gears
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Typical sizes range from 300mm-2000mm, with other sizes upon request.
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Available with different corrosion protection coatings
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Mating pinions are available for all slewing bearings.

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