SKF
Matched Tapered Roller Bearings
Matched tapered roller bearings consist of two single row bearings that have been factory-paired and ground to provide a defined axial clearance or preload when mounted face-to-face or back-to-back. SKF offers matched sets in various configurations (arrangement suffixes like J2/DB, J2/DF) for applications requiring higher thrust capacity, stiffness, or bidirectional axial load support. Using matched pairs eliminates the need for on-site shimming and adjustment, guaranteeing reliable performance. These sets are commonly used in pump shafts, industrial gearboxes, crane wheels, and rolling mill drives. Matched sets simplify inventory and assembly, reducing installation time and the risk of incorrect clearance settings. SKF manufactures them with tight control over width and raceway dimensions, ensuring uniform load sharing between the two bearings.
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Factory-Set Clearance/Preload
No adjustment needed; just mount and tighten retention.
Bidirectional Thrust Capability
Pairs handle reversing axial loads with one pre-configured set.
Uniform Load Distribution
Matched to micron-level precision, both bearings share load equally.
Simplified Procurement
One ordering code for a complete pair.
High System Stiffness
Back-to-back arrangements provide excellent tilting rigidity.
Reduced Assembly Errors
Eliminates field measurement and shimming errors.
Arrangement Options for Matched Tapered Roller Bearings
Face-to-face (DF) mounting provides some misalignment tolerance and is suitable where shaft expansion needs accommodation. Back-to-back (DB) offers maximum rigidity against moment loads, ideal for pinion shafts and bevel gears. Tandem (DT) doubles the single-direction thrust capacity.
Matched Sets in Heavy Industrial Gearboxes
Output shafts of large industrial gearboxes frequently use matched DB tapered roller bearings to rigidly support the shaft and counteract bevel or helical gear thrust forces. The factory-set preload maintains gear alignment under dynamic loads, improving efficiency and durability.