Tapered Roller Bearing is a rolling-element bearing that uses conical rollers and raceways to simultaneously support radial and axial loads, providing high load capacity, rigidity, and durability in automotive, industrial, and heavy-duty applications.
1. Single-Row Tapered Roller Bearings
Most common design
Supports combined radial and axial loads (axial load in one direction)
Typically used in matched pairs for bidirectional axial support
Applications: Automotive wheel hubs, gearboxes, transmissions
2. Double-Row Tapered Roller Bearings
Two rows of tapered rollers arranged in a single unit
Capable of supporting radial loads and axial loads in both directions
Higher rigidity compared to single-row types
Applications: Automotive axle systems, industrial gear units
3. Four-Row Tapered Roller Bearings
Designed for extremely heavy radial loads
Limited axial load capability
High structural rigidity
Applications: Rolling mills, heavy machinery, steel production equipment
4. Matched Pair (Back-to-Back / Face-to-Face / Tandem)
Two single-row bearings installed in specific arrangements:
Back-to-Back (DB): High moment rigidity
Face-to-Face (DF): Better misalignment tolerance
Tandem (DT): Increased axial load capacity in one direction
Applications: Machine tools, high-load transmission systems
1. Inner Ring (Cone)
Function:
Provides the inner raceway for the tapered rollers
Mounted directly on the shaft
Transmits load from the shaft to the rolling elements
Material:
High carbon chromium bearing steel (GCr15 / AISI 52100)
Through-hardened or case-hardened for high fatigue resistance
Surface precision-ground for dimensional accuracy
2. Outer Ring (Cup)
Function:
Contains the outer raceway
Installed into the housing
Works with the cone to guide tapered rollers
Material:
High carbon chromium bearing steel (GCr15 / AISI 52100)
Hardened and ground to ensure load capacity and wear resistance
3. Tapered Rollers
Function:
Carry both radial and axial loads
Conical geometry ensures proper load distribution and rolling motion
Designed to converge at a common apex point for smooth rotation
Material:
High-grade bearing steel (GCr15 / AISI 52100)
Super-finished surface for reduced friction and extended life
Optional: Carburized alloy steel for heavy-duty applications
4. Cage (Retainer)
Function:
Maintains proper spacing between rollers
Guides rollers and prevents contact between adjacent rolling elements
Reduces friction and heat generation
Material Options:
Pressed steel (standard industrial applications)
Machined brass (high load and high-speed applications)
Engineered polymer (low-noise or light-load environments)
5. Lubrication (Grease or Oil)
Function:
Reduces friction and wear
Dissipates heat
Prevents corrosion
Types:
Lithium-based grease (general industrial use)
Synthetic grease (high-speed or high-temperature applications)
Oil lubrication (heavy-load or high-speed systems)
The specifications of tapered roller bearings mainly include inner diameter (d), outer diameter (D), width (B/T/C), basic dynamic load rating (C), basic static load rating (C0), and limiting speed. These bearings are designed with a separable structure, with interchangeable inner and outer ring assemblies, conforming to ISO 355 standards, and are suitable for bearing heavy combined radial and axial loads.
| Bearing Model | Inner Diameter d(mm) | Outer Diameter D(mm) | Width T(mm) | Dynamic load C(kN) | Static load C0 (kN) | Limiting speed (r/min) |
| 30203 | 17 | 40 | 13.25 | 18.5 | 17.6 | 15000 |
| 30204 | 20 | 47 | 15.25 | 26.5 | 26.5 | 13000 |
| 30205 | 25 | 52 | 16.25 | 30.5 | 32.5 | 11000 |
| 30206 | 30 | 62 | 17.25 | 41.5 | 45 | 9000 |
| 30207 | 35 | 72 | 18.25 | 52.5 | 60 | 8000 |
| 30208 | 40 | 80 | 19.75 | 65 | 75 | 7000 |
| 30210 | 50 | 90 | 21.75 | 77 | 96.5 | 6000 |
| 32205 | 25 | 52 | 19.25 | 37 | 40.5 | 10000 |
| 32206 | 30 | 62 | 21.25 | 50 | 57 | 8500 |
| 32208 | 40 | 80 | 24.75 | 77 | 93 | 6700 |
| 32210 | 50 | 90 | 24.75 | 93.5 | 120 | 5600 |
| LM11949/10 | 19.05 | 45.237 | 15.494 | 26.9 | 29.5 | 11000 |
| L44649/10 | 25.4 | 50.292 | 14.224 | 33.5 | 39.5 | 10000 |
Key Design Parameters
Size Standards: Mostly conforms to ISO 355 standards, some are imperial series.
Separability: The inner ring with rollers and cage (assembly) can be installed separately from the outer ring.
Load Capacity: Primarily withstands radial loads, but can also withstand unidirectional axial loads. When used in pairs, it can withstand bidirectional loads.
Tolerances and Clearance: Standard general grade, higher precision grades such as P5 are available; clearance standards can be adjusted according to specific applications.
Suffix Definitions:
Conical roller and raceway geometry ensures optimal load distribution
Simultaneously supports heavy radial loads and axial loads
Ideal for high-impact and high-torque environments
High structural stiffness improves shaft positioning accuracy
Minimizes deflection under heavy load
Ensures stable performance in transmission systems and gear assemblies
Premium-grade bearing steel (GCr15 / AISI 52100) with optimized heat treatment
Precision grinding and super-finishing reduce friction and wear
Enhanced fatigue resistance for continuous-duty applications
Single-row, double-row, and four-row designs
Matched pair arrangements (DB, DF, DT) for specific load requirements
Custom dimensions and preload settings available
Optional surface treatments for corrosion resistance
High-performance lubrication solutions
Engineered sealing options for contaminated conditions
Customized internal clearance, preload, and cage design
Material upgrades for high-speed or heavy-duty applications
Stable mass production with strict quality control standards
Automotive Industry
Wheel hubs
Transmissions
Differentials
Axle systems
Industrial Gearboxes & Transmission Systems
Speed reducers
Industrial drive systems
Heavy-duty gear assemblies
Rolling Mills & Metallurgical Equipment
Steel rolling lines
High-load shaft support systems
Construction & Mining Equipment
Excavators
Crushers
Load-bearing rotating assemblies
Energy & Power Equipment
Wind turbine gearboxes
Heavy-duty rotating machinery
Advanced production technology and strict dimensional control
Stable supply capacity for OEM and aftermarket demand
Comprehensive inspection: hardness, load testing, vibration, and life evaluation
Competitive cost-performance ratio for global markets
Our Tapered Roller Bearings deliver the optimal combination of high load capacity, rigidity, durability, and precision, ensuring reliable performance in the most demanding mechanical systems.
Partner with us to secure a dependable bearing solution that enhances equipment efficiency, reduces downtime, and supports long-term operational success.
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Hi, I am Maxwell, I am an engineer in the field of bearing applications. I majored in mechanical and electromechanical engineering during college. After graduation, I worked for the top three "SKF" bearing companies in the world for ten years , during which I went to dozens of customers in different industries to help them solve problems in bearing applications; later I joined VKUKEN Bearing Manufacturing, and I will share bearing technical knowledge on this website from time to time. If you are a customer Please contact me to help you solve your problem; if you are also a technical expert in bearings, I am very willing to exchange technical knowledge about bearings with you.
