SKF
Four-Row Tapered Roller Bearings
Four-row tapered roller bearings provide maximum combined radial and axial load capacity in an envelope similar to four-row cylindrical types but with inherent thrust capability. They are the premier choice for rolling mill roll necks, particularly in hot and cold strip mills where axial loads from roll bending and strip tension are significant. SKF designs include sealed and unsealed versions, with bore sizes up to over one meter. The inner rings and outer ring(s) are separable for installation, and the bearing arrangement can be optimized for specific mill stand loads. Advanced SKF heat treatment, case-carburized rings, and high-capacity internal geometries ensure longevity under repeated shock loading. These bearings often integrate with chock assembly, lubrication, and sealing systems tailored by SKF’s application engineers for specific mill specifications.
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Trusted by Industry Leaders
Extreme Load Carrying
Four roller rows handle massive radial and bidirectional thrust.
High Stiffness and Precision
Maintains strip thickness control under high mill forces.
Integrated Sealing Solutions
Customized labyrinth or lip seals block mill coolant and scale.
Separable Design
Components fit complex roll chocks and enable efficient roll changes.
Case-Carburized Rings
Tough core and hard surface resist shock and crack propagation.
Lubrication System Integration
Engineered oil or grease flow passages for long life.
Four-Row Tapered Bearings in Hot Strip Mills
In finishing stands, these bearings endure temperatures over 100°C, water spray, and dynamic thrust. SKF’s optimized sealing and high thermal stability grease extend relubrication intervals beyond 1,000 hours, a key factor for mill productivity. Advanced cage designs prevent roller skewing under acceleration.
Maintenance and Reconditioning of Four-Row Tapered Roller Bearings
Given their value, SKF offers inspection and reconditioning services that can restore a used bearing to near-new performance at a fraction of replacement cost. Regular inspections during roll changes catch early damage, avoiding catastrophic failures.