Product Type: Four-Row Tapered Roller Bearing

1. Overview

Exclusively engineered for heavy-duty machinery, the 380690 four-row tapered roller bearing is recognized as a high-performance part. It is rendered an ideal selection for essential industrial equipment by virtue of its superior ability to resist heavy and impact loads.

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2. Basic Dimensions

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3. Structural Features

Component Composition: For your heavy-duty equipment, the bearing adopts a composite structure including two double-raceway inner rings, one double-raceway outer ring, and two single-raceway outer rings. This design is specifically engineered to ensure stable force distribution, a key requirement for reliable operation.
Clearance Adjustment: To adapt to your equipment’s diverse working conditions, special spacers are arranged between the inner and outer rings, enabling accurate adjustment of bearing clearance to maintain optimal performance.
Load-Bearing Advantage: Through targeted structural optimization, the bearing can simultaneously withstand large radial loads and certain axial loads, significantly improving overall load-bearing efficiency and reducing maintenance costs for your operations.

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4. Load-Carrying Capacity

Radial Load Capacity: For your heavy-duty equipment, this bearing boasts a radial load capacity approximately 2.5–3.5 times that of single-row tapered roller bearings. This critical advantage guarantees stable, uninterrupted operation even under your system’s highest load demands.
Load Type Adaptability: It excels at handling the combined radial and axial loads (with radial loads as the primary force) common in your operations and can reliably withstand heavy loads and impact loads in your harsh operating environments.

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5. Performance Characteristics

Limiting Speed: Sliding contact between the rib and roller end leads to higher friction during operation, which makes the limiting speed of four-row tapered roller bearings comparatively lower than other bearings of identical size.
Axial Load Capacity: Whereas single-row tapered roller bearings can only handle axial loads in one direction, the four-row design is optimized for heavy bidirectional axial loads. This capability ensures precise axial positioning and efficiently absorbs thrust in rolling operations. It mainly undertakes heavy radial loads while managing bidirectional thrust, ideal for industrial applications such as rolling mills.

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6. Material & Manufacturing

Heat Treatment: Special heat treatment process applied to enhance hardness, wear resistance, and fatigue life.

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7. Application Fields

What’s it mainly used for? 

Rolling mill work rolls and backup rolls. It’s designed specifically for those parts, so it’s a perfect fit for European rolling mills that require high precision and heavy-load performance.

Any other uses? 

Cranes, mining machinery, wind turbines, all that heavy-duty stuff. These machines need great resistance to high loads and impacts, and this component delivers.