231/630BK.MB.C4 bearings ( 630 mm x 1030 mm x 315 mm) have the advantages of Self-aligning, high load-bearing capacity, impact resistant, and adaptable to heavy loads, and are therefore widely used in the Gearboxes, drive shafts, conveying equipment, general machinery.

| Part Number | 231/630BK.MB.C4 |
| Design drawing | 2 |
| Design Type | B = with fixed central rib |
| Bore Type | K = Tapered bore (K = taper 1:12) |
| RIC | C4 |
| Row | 2 |
| Bearing Type | Spherical roller bearings With central rib Tapered bore(K = taper 1:12) |
| Manufacturer Part Code | 231/630BKMBC4 |
| Cage | MB = Solid brass cage, guided on inner ring |
| Measurement | Metric |
| d φ Inside [inch] | 24.803 |
| D Φ Outside [inch] | 40.551 |
| B Width [inch] | 12.402 |
| nB Reference speed (grease) [min–1] | 253 |
| nG Limiting speed (oil) [min–1] | 476 |
| Weight [kg] | 1040 |
| r(min.) Chamfer [inch] | 0.295 |
| D1 [inch] | 35.283 |
| ds [inch] | 0.492 |
| ns [inch] | 0.925 |
| Cr Radial Dynamic [lbf] | 2203024 |
| C0r Radial static [lbf] | 4675825 |
| Cur Radial Fatigue [lbf] | 321451 |
| Temperature - T(min)[°C] | -30 |
| Temperature - T(max)[°C] | +200 |
| Mounting dimensions | |
| da(min.) [inch] | 26.063 |
| Da(max.) [inch] | 39.291 |
| ra(max.) [mm] | 1040 |
| Calculation coefficient | |
| e | 0.31 |
| Y0 | 2.16 |
| Y1 | 2.21 |
| Y2 | 3.29 |
The 231/630BK.MB.C4 Double-row spherical roller bearings mainly consist of an inner ring, an outer ring, two rows of spherical rollers, a cage, and seals. The outer ring raceway has a spherical structure, while the inner ring has a double-row raceway. The rollers and raceways are logarithmically curved. The cage is typically made of stamped steel or machined brass.
Double-row spherical roller bearings possess excellent self-aligning properties, compensating for shaft deflection, installation errors, and misalignment. They can simultaneously withstand radial loads and bidirectional axial loads, exhibiting extremely high load-bearing capacity and strong impact resistance. Furthermore, the internal clearance can be optimized for vibration conditions, effectively reducing frictional temperature rise.















