Function & Product Specifications
Steel mill bearings face radiant heat, abrasive mill scale, coolant ingress, and 24/7 production. BMI Bearings uses 8620 carburized steel (case depth 2.5–4.0 mm, core 58–62 HRC) for impact resistance and crack prevention based on application needs. Designs focus on extended life and lower TCO through advanced metallurgy, precision sealing, and application-specific geometry.
Product Range & Key Specs
- Sendzimir Mill Bearings
Multi-row cylindrical rollers for backup rolls. High radial stiffness, runout ≤ 0.005 mm, speeds up to 1,500 RPM. Carburized rings resist brinelling. - Tension Leveller Bearings
For flexing work rolls. Internal clearance C4–C5 accommodates roll bending. - Combined Bearings
Combined bearings are heavy-duty components designed to handle simultaneous axial and radial loads. They integrate a radial bearing and an axial roller into a single, compact unit. This design optimizes space, reduces manufacturing costs, and simplifies structural layouts. - CARB Bearings
CARB toroidal roller bearings combine the self-aligning capability of a spherical roller bearing with the unconstrained axial displacement of a cylindrical roller bearing in a single, space-saving design. - Flexible Roller Bearings
Flexible roller bearings feature hollow, spirally wound rollers that absorb severe shocks, deflections, and structural misalignments while operating efficiently in high-temperature or dirty environments. - Spherical Roller Bearings
Spherical roller bearings feature two rows of symmetrical rollers running in a common spherical outer raceway, allowing them to manage exceptionally heavy radial and axial loads while automatically correcting shaft misalignment. - Sealed Spherical Roller Bearings
Sealed spherical roller bearings integrate high-performance contact seals to protect the inner elements from contamination and retain lubricant, drastically extending service life in harsh environments without the need for manual relubrication.
Common Specifications
- Material: 8620 carburized steel and 52100/100 CrSiMn6.
- Heat stabilization: Up to +200°C; high-temp variants available.
- Clearance: C4/C5 standard for thermal expansion in hot mills.
- Cages: Machined brass, steel, or PEEK – selected per speed, temp, and lubrication (oil mist, flood, or grease).
- Surface: Black oxide or phosphate coating for break-in and corrosion protection.
Operational Gains
- Extended MTBF – fewer unplanned stoppages.
- Lower lubricant consumption and cooler running.
- Reduced housing wear.
- Predictable replacement intervals for condition-based maintenance.