SKF
Trunnion Bearing Housings for Grinding Mills (FSDR..K Series)
SKF FSDR..K series housings are specialised, extremely heavy-duty plummer blocks for the trunnion bearings of horizontal grinding mills (ball, SAG, rod mills) in mineral processing. They support the rotating mill shell via its hollow trunnion journals, absorbing the dynamic and static weight of the mill and its charge. These housings are fabricated from cast steel or spheroidal graphite iron, with integrated water-cooling channels for the bearing and oil lubrication circulation systems. The bearing is typically a large spherical roller bearing or a journal bearing arrangement. FSDR..K housings incorporate labyrinth, taconite, or special seals to prevent slurry and dust ingress. They are engineered for very long life under constant, heavy load and the frequent shock of ball impacts. SKF provides full application engineering, including housing stress analysis, lubrication system design, and on-site installation supervision.
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Trusted by Industry Leaders
Mill-Specific Engineering
Customised to mill dimensions, weight, and load cycle.
High Load Capacity Cast Steel
Withstands static and dynamic forces with high safety factors.
Integrated Oil Cooling
Channels circulate cooling water to manage bearing temperature.
Slurry Sealing Technology
Multi-barrier seals keep grinding slurry out of the bearing.
Condition Monitoring Ready
Temperature, vibration, and oil analysis ports built in.
Full Technical Support
SKF engineers design, commission, and test for each installation.
Bearing and Lubrication System for Grinding Mill Trunnions
In a SAG mill, the trunnion bearing experiences rock-on-shell impacts and high variability in load. SKF’s FSDR..K uses a hydrostatic/hydrodynamic lift system during start-stop to protect the bearing, then transitions to a full-film oil wedge during running. This dramatically extends bearing and mill life.
Case Study: Converting a Mill Trunnion to SKF Spherical Roller Bearings
Replacing a failing journal bearing with an FSDR..K spherical roller housing eliminated the need for high-pressure lift pumps and reduced oil consumption while increasing load capacity. This conversion improved mill availability and reduced maintenance complexity in several copper concentrators.