Product Type: Four-Row Tapered Roller Bearing

1. Overview

The 380688 four-row tapered roller bearing is tailored for your heavy-duty machinery needs— a high-performance part exclusive to this sector. Its excellent heavy and impact load resistance makes it the perfect choice for your critical industrial equipment.

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2. Basic Dimensions

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3. Structural Features

Component Composition: The bearing is composed of two double-raceway inner rings, one double-raceway outer ring, and two single-raceway outer rings. This structural design is crucial for ensuring stable force distribution.

Clearance Adjustment: The integration of special spacers between the inner and outer rings provides a mechanism for accurate clearance adjustment. This feature is essential for the bearing to adapt to the varying mechanical demands of different working conditions, as confirmed by field testing.
Load-Bearing Advantage: Structural optimization has been implemented to enhance the bearing’s load-bearing capabilities. The resulting design allows for the simultaneous withstanding of large radial loads and certain axial loads, leading to a measurable improvement in the bearing’s overall load-bearing efficiency.

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4. Load-Carrying Capacity

How strong is its radial load capacity? 

About 2.5–3.5 times that of single-row tapered roller bearings, which guarantees it runs stable when loads are high.

What loads can it handle?

 Combined radial-axial loads (radial main) and it can take heavy/impact loads in harsh operating environments—perfect for heavy-duty work.

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5. Performance Characteristics

Limiting Speed: Owing to structural features, especially the sliding contact between the rib and roller end, four-row tapered roller bearings generate higher friction during operation. Therefore, their limiting speed is relatively lower than that of other bearings of similar size, such as four-row cylindrical roller bearings.
Axial Load Capacity: Unlike single-row tapered roller bearings that can only support unidirectional axial loads, the four-row design is specially engineered to carry heavy bidirectional axial loads. This dual-direction capability ensures accurate axial positioning of the shaft and efficiently absorbs thrust during rolling. Since it mainly sustains heavy radial loads while handling bidirectional thrust, it is ideal for complex combined load applications like 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

Primary Application: For European rolling mill operators seeking high-precision, heavy-load performance, this product is specifically designed for work rolls and backup rolls, delivering a tailored solution.
Other Applications: In industries like construction, mining, and renewable energy, it is widely applied to cranes, mining machinery, and wind turbines—equipment that faces constant high loads and impact forces.