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Rolling Components Category

Thrust Roller Bearings

Designed for Extreme Axial Shock Loads

Built for heavy axial loads. Using cylindrical or tapered rollers, these bearings handle immense thrust loads in heavy machinery, including extruders, gearboxes, and oil well equipment.

Spherical thrust roller bearings can also accommodate radial loads and correct misalignment defects due to their spherical outer raceway design. They are essential in heavy marine propulsion shafts, vertical gear reducers, drilling rig swivels, metal extruders, and heavy cranes. BMT Impex supplies these in premium case-hardened alloy steels.

Thrust Roller Bearings Category
Severe Duty Sizing Chart

Technical Specifications & Sizing

Standard dimensional parameters for popular cylindrical and spherical thrust series.

Bearing Model Bore (d) Outer Dia (D) Width (H) Dynamic Load (Cr) Static Load (Cor) Limiting Speed (Oil) Configuration Type
81102 15 mm 28 mm 9 mm 11.2 kN 22.8 kN 4,000 RPM Cylindrical Thrust
81105 25 mm 42 mm 11 mm 24.1 kN 58.0 kN 3,200 RPM Cylindrical Thrust
81206 30 mm 52 mm 16 mm 42.5 kN 98.0 kN 2,800 RPM Cylindrical Thrust
81210 50 mm 78 mm 22 mm 76.5 kN 200.0 kN 2,200 RPM Cylindrical Thrust
29240 200 mm 290 mm 54 mm 765.0 kN 2,750.0 kN 1,200 RPM Spherical Thrust
29330 150 mm 250 mm 60 mm 780.0 kN 2,550.0 kN 1,300 RPM Spherical Thrust
29420 100 mm 210 mm 67 mm 815.0 kN 2,400.0 kN 1,500 RPM Spherical Thrust
29430 150 mm 300 mm 90 mm 1,600.0 kN 4,750.0 kN 1,000 RPM Spherical Thrust

* Spherical thrust rollers are equipped with machined brass cages or heavy steel guide pins.

Engineering Insights

Bearing Nomenclature & Clearance Guide

Understanding the technical suffixes, clearance prefixes, and material ratings used in industrial procurement.

Suffix & Prefix Reference

  • 811 / 812: Cylindrical roller thrust bearing washer series for extreme axial loads.
  • 292 / 293 / 294: Spherical roller thrust bearing series with self-aligning capability.
  • M / E: Machined brass cage (M) or optimized internal design with larger rollers (E).
  • TB: Hardened steel guide cage for heavy vibratory transmissions.

Clearance & Preload Rules

  • Self-Aligning: Spherical thrust washers tolerate shaft misalignment up to 3 degrees.
  • Cylindrical Thrust: Requires strict alignment; zero misalignment tolerated.
  • Preload Springs: Springs are often used to pre-tension rollers, preventing skidding.
  • Lubrication: Typically requires circulating oil or oil-bath lubrication to cool high sliding friction.
Technical Guide

Bearing Selection & Sizing Guide

Critical engineering parameters, structure details, and operating limits to help you select the ideal component.

Extreme Axial Capacity

Designed to support extremely heavy axial loads and heavy shock forces. Very rigid and solid layout. Spherical variants can support a small percentage of radial load in addition.

Spherical Rib Contact

Spherical roller thrust barrel rollers are inclined to the shaft axis. The load is transmitted obliquely, allowing misalignment and combined axial/radial capacities.

Heavy-Duty Systems

Widely deployed in marine propeller shafts, steel extruder gearboxes, oil drilling rotary tables, chemical pulp mill refiners, and heavy-duty crane pivots.

Target Environments

Common Industrial Applications

These bearings are engineered to deliver reliable rotation and support critical equipment in harsh sectors, including:

Crane Swivels

Supports massive static hanging loads inside industrial crane hooks and hoists.

Extruders

Withstands extreme back-pressure forces in plastic screw extrusion machines.

Drilling Swivels

Carries high drilling pressures inside oil and water well rotary tables.

Thrust Blocks

Absorbs forward propeller thrust forces in commercial marine propulsion shafts.

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FAQ

Frequently Asked Questions

Technical details, selection parameters, and service queries resolved by our engineering sales team.

They include Cylindrical Thrust Rollers (heavy static load, low speed), Tapered Thrust Rollers (heavy thrust, high rigidity), and Spherical Thrust Rollers (self-aligning, higher speed capacity).
Cylindrical and tapered thrust rollers cannot carry any radial load. However, spherical thrust rollers are angled and can carry radial loads up to 55% of the simultaneous axial load.
They must be mounted perpendicular to the shaft axis. In horizontal setups, correct spring preloading is often recommended to prevent the rollers from slipping due to centrifugal forces.