Product Type: Four-Row Tapered Roller Bearing

1. Overview

The 381188 four-row tapered roller bearing is a high-performance component for which exclusive design for heavy-duty machinery has been implemented. Its exceptional performance in withstanding heavy and impact loads results in it being regarded as an ideal choice for critical industrial equipment.

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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: Radial load capacity ~2.5–3.5x single-row tapered roller bearings—guarantees stable operation under your equipment’s high-load conditions.
Load Type Adaptability: Excels at combined radial-axial loads (radial primary) and withstands heavy/impact loads in your harsh operating environments.

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5. Performance Characteristics

Limiting Speed: Four-row tapered roller bearings exhibit higher operational friction due to their structural characteristics, especially the sliding contact between the rib and roller end. Hence, their limiting speed is relatively lower than other comparable bearings.
Axial Load Capacity: Compared with single-row tapered roller bearings that only endure unidirectional axial loads, four-row tapered roller bearings are engineered to resist heavy axial loads from both directions. This dual-direction ability ensures accurate axial positioning and effectively controls thrust during rolling. Since it primarily sustains heavy radial loads, it is perfect for complex combined load environments.

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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: It is specifically made for the work rolls and backup rolls of rolling mills. It fits perfectly with European rolling mill equipment that needs high precision and can handle heavy loads.
Other Applications: It’s also widely used on heavy-duty machines like cranes, mining gear, and wind turbines—these machines need to stand up to really high loads and sudden impacts, and this product does the job.