Application:
Trunnion Bearing Applications Across Industries
Trunnion bearings are essential in bulk material handling and rotary processing systems, where rotation under load must be smooth and stable.
| Industry |
Applications |
| Cement Plants |
Rotary kilns, clinker coolers, horizontal mills |
| Mining & Minerals |
Ball mills, SAG mills, crushers |
| Power Generation |
Coal pulverizers, dryers, biomass rotary units |
| Fertilizer & Chemicals |
Rotary granulators, mixers, and reactors |
| Metallurgical Plants |
Smelting furnaces, annealing drums |
What Is a Trunnion Bearing?
A trunnion bearing is a support unit that enables a rotating drum, mill, or shell to turn smoothly around its axis. Mounted on either end of a rotating cylinder (or ‘trunnion’), it distributes the weight of the structure while permitting free rotation. These bearings are typically housed in heavy-duty cast steel or cast iron housings and are lined with white metal or bronze-based bearing materials.
A trunnion bearing assembly includes:
- Trunnion Shaft (Journal Surface) – Machined surface rotating inside the bearing
- Bearing Insert (Liner/Bush) – Made of white metal, bronze, or bimetal alloys
- Pedestal Housing – Provides structural support and alignment
- Sealing System – Prevents ingress of dust, slurry, or moisture
- Lubrication Arrangement – Forced oil or oil bath system ensures hydrodynamic film formation
Proper alignment, material compatibility, and thermal expansion accommodation are key to its long-term performance.
Materials That Withstand the Pressure
Each component is manufactured using durable, high-grade materials selected to withstand abrasive loads, high heat, and continuous operation.
| Component |
Material / Characteristics |
| Trunnion Journal |
Forged steel or alloy steel – High strength, wear resistance |
| Bearing Liner |
White Metal (Babbitt), Bronze, or Bimetal – Conformability, shock absorption |
| Housing |
Cast Iron, SG Iron, or Cast Steel – Withstands load, impact, and misalignment |
| Seals & Gaskets |
Labyrinth, Rubber, or Custom – Dust and fluid ingress protection |
RoHS-compliant and lead-free bearing materials are available for environmentally regulated industries.
Our Product Range Includes:
- Trunnion Bearings for Ball Mills and SAG Mills
- Rotary Kiln Trunnion Bearings
- Custom-Fit Trunnion Bushings and Housings
- Split and Solid Housing Options
- Sealed and Open-End Designs Based on Environment
- Reverse-Engineered Replacement Units for Legacy Systems
Reverse Engineering & Custom Manufacturing
When dealing with older mills or imported equipment lacking data, trunnion bearings can be fully reverse-engineered to create exact-fit, performance-improved replacements.
Capabilities include:
- Shaft/trunnion diameters from 150 mm to 1200 mm+
- Liner and bushing re-creation based on wear analysis
- Customized housings to match mountings and thermal expansion
- Material upgrades for corrosive, abrasive, or high-heat conditions
- On-site measurement, CAD modeling, and fast-track prototyping
Each replacement unit is tested for fit, function, and endurance.
Why Choose Trunnion Bearings?
- Supports Massive Loads: Ideal for rotating systems with heavy axial and radial pressure
- Smooth Hydrodynamic Lubrication: Reduces friction and enhances service life
- High Misalignment Tolerance: Pad and liner systems accommodate minor shaft movement
- Thermal & Shock Resistance: Maintains integrity under fluctuating operational stresses
- Long-Term Service: Minimal maintenance with robust sealing and material options
Why Partner with Metatek Engineering?
- Application-based design for rotary systems across sectors
- In-house casting, machining, and metallurgy facilities
- Expertise in replacement of OEM and outdated components
- DIN and ISO standards compliance
- Fast response for custom design, manufacturing, and MRO supply
Need a heavy-duty bearing that rotates with power and precision?
Trunnion Bearings by Metatek Engineering are built to carry the load—no matter how extreme the environment.
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