SKF
Four-Row Cylindrical Roller Bearings
Four-row cylindrical roller bearings are engineered for extreme radial loads, particularly in rolling mill work rolls and backup roll chocks where roll forces can reach thousands of tons. By distributing the load over four roller rows, SKF provides maximum load-carrying capacity within a limited cross-section. These bearings have separable inner and outer rings, and optional bored or tapered bore designs. They are typically lubricated with oil or grease via carefully designed distribution grooves and holes. SKF’s four-row cylindrical roller bearings for steel mills incorporate high-capacity designs, through-hardened rings, and case-hardening options for severe shock loads. Robust machined cages guide the rollers accurately under acceleration and deceleration cycles. Integrated sealing arrangements protect against scale and cooling water, greatly extending bearing life in the demanding rolling environment.
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Maximum Radial Load Capacity
Four roller rows carry enormous forces in minimal radial space.
Separable Components for Roll Change
Rings and roller assemblies can be mounted/dismounted quickly during roll changes.
Heavy-Duty Cages
High-strength brass or steel cages resist fatigue from acceleration and vibration.
Advanced Sealing Integration
Customized labyrinth and lip seals prevent cooling water and mill scale ingress.
Optimized Lubrication Channels
Grease and oil flow to each row uniformly.
Extended Life in Harsh Mills
Special heat treatment and SKF Explorer quality reduce spalling and wear.
Four-Row Cylindrical Roller Bearings in Cold and Hot Rolling Mills
These bearings are critical to maintaining strip thickness tolerance. SKF works with mill designers to match internal clearance, fit tolerances, and cage design to specific mill stands — from high-speed cold mills to high-temperature hot strip mills. The payoff is fewer roll changes and higher mill productivity.
Installation and Maintenance of Four-Row Bearings
Due to their size and precision, mounting requires induction heaters for the inner ring and hydraulic tools for dismounting. SKF provides on-site supervision and training to ensure correct procedures, preserving the bearing’s full fatigue potential.