32228T158/DB Bore 140 Mm, Matched Tapered Roller Bearings Arranged Back-to-back
The 32228T158/DB These configurations are widely used in machine tool spindles, gearboxes, industrial robot joints, and automotive wheel hubs, where precise control of axial stiffness and load distribution is required. DB is used for high-rigidity spindles (such as machining centers), DF for general-purpose machinery prone to thermal deformation, and DT for heavy-duty lathe or rolling mill drive systems.
The 32228T158/DB bearing is a Matched tapered roller bearings arranged back-to-back with an inner diameter of 140 mm , an outer diameter of 250 mm, a width of 158 mm. GCr15SiMn rings, GCr15SiMn rolling mlement. Its dynamic radial rated load is approximately 1180415 N, its static radial rated load is approximately 1997208 N. together determine its load-bearing capacity, rotational accuracy, and applicable working conditions.
32228T158/DB bearings ( 140 mm x 250 mm x 158 mm) have the advantages of Anti-tipping, fault-tolerant installation, ultra-high thrust, and are therefore widely used in the Machine tools, gearboxes, heavy machinery.
| Part Number | 32228T158/DB |
| Interchangeable | SKF 32228T158/DB |
| Bearing Type | Matched tapered roller bearings arranged back-to-back |
| Units | Metric |
| Series | 32200 series (322..T158/DB) |
| Contact angle - α [°] | 16.172 |
| Matched arrangement | DB = Two bearings matched for mounting back-to-back(<>) |
| Flange | No |
| Bore | Cylindrical bore |
| Relubrication | With |
| Heat stabilized | 120 °C (250 °F) |
| Row NO. | Two |
| Bearing Mass - m [lb] | 66.579 |
| Manufacturer Part Code | 32228T158/DB |
| Matched Row No. | Two |
| Bearing part | Complete |
| Seal | Open |
| Coating | No |
| Lubricant | No |
| Cage | Stamping steel cage |
| d φ Inside [inch] | 5.512 |
| D Φ Outside [inch] | 9.843 |
| T Thickness [inch] | 6.220 |
| d1 [inch] | 7.535 |
| l spacer ring [inch] | 0.571 |
| b [inch] | 0.157 |
| B Cone [inch] | 6.220 |
| C Cup [inch] | 5.138 |
| K lubrication hole [inch] | 0.118 |
| a pressure points [inch] | 5.256 |
| r1,2 min. Chamfer [inch] | 0.157 |
| r5 min. [inch] | 0.039 |
| db min. [inch] | 6.161 |
| Db min. [inch] | 9.370 |
| rc max. [inch] | 0.039 |
| Cb min. [inch] | 0.531 |
| ra max. [inch] | 0.157 |
| e Limiting value | 0.43 |
| Y1 Calculation coefficient | 1.6 |
| Y2 Calculation coefficient | 2.3 |
| Y0 Calculation coefficient | 1.6 |
| Cr Radial Dynamic [lbf] | 265357 |
| C0r Radial Static [lbf] | 448972 |
| Pu Fatigue load limit [lbf] | 44452 |
| nB Speed ratings (grease) [rpm] | 1432 |
| nG Speed ratings (oil) [rpm] | 2543 |
The 32228T158/DB DB (back-to-back) configurations involve two bearings with their outer rings facing each other from back to back; DF (face-to-face) configurations involve outer rings facing each other from front to front; and DT (tandem) configurations involve two bearings arranged in the same direction. Each group consists of two independent bearings, and specific performance is achieved through spacer rings or preload adjustment.
The DB configuration offers the highest rigidity and strong anti-tipping capability, suitable for bearing bidirectional axial loads and moment loads; the DF configuration allows for slight angular misalignment between the shaft and bearing housing, providing good self-aligning performance; the DT configuration can significantly increase unidirectional axial load capacity, suitable for heavy-duty unidirectional applications. All three configurations can achieve precise preload, improving system rigidity and rotational accuracy.
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