Product Type: Four-Row Tapered Roller Bearing

1. Overview

Classified as a high-performance part, the 381088 four-row tapered roller bearing is exclusively designed for heavy-duty machinery. Heavy loads and impact loads are withstood exceptionally well by it, rendering it an ideal selection for essential equipment in industrial applications.

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2. Basic Dimensions

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3. Structural Features

Component Composition: The bearing’s composite structure (2 double-raceway inner rings, 1 double-raceway outer ring, 2 single-raceway outer rings) ensures stable force distribution.
Clearance Adjustment: Special inter-ring spacers enable accurate clearance tuning to meet your equipment’s varying working conditions.
Load-Bearing Advantage: Structural optimization allows simultaneous large radial + certain axial load resistance, boosting overall load efficiency for your critical machinery.

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4. Load-Carrying Capacity

Radial Load Capacity: In comparison with single-row tapered roller bearings, the subject bearing offers a 2.5–3.5x increase in radial load capacity, which is a key factor in guaranteeing stable operation when subjected to high-load demands.
Load Type Adaptability: Unlike traditional bearings with limited load adaptability, this model excels at combined radial-axial loads (radial primary) and exhibits strong resistance to heavy/impact loads in harsh operating environments.

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5. Performance Characteristics

Limiting Speed: Because of the sliding contact between the rib and roller end in its structure, four-row tapered roller bearings produce greater friction during operation. As a result, the limiting speed is lower compared with similar-size bearings such as four-row cylindrical roller bearings.
Axial Load Capacity: Single-row tapered roller bearings are limited to unidirectional axial load support, while the four-row structure is purpose-built to handle heavy bidirectional axial loads. This bidirectional performance ensures reliable shaft positioning and efficiently absorbs rolling thrust. Importantly, it mainly supports heavy radial loads, making it highly suitable for rolling mill applications.

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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: European rolling mills require components that balance high precision and heavy-load capacity—this product, designed for work/backup rolls, is the ideal match for such requirements.
Other Applications: For heavy-duty equipment that cannot afford downtime due to load failure, it is widely used in cranes, mining machinery, and wind turbines, thanks to its excellent high-load and impact resistance.