Specifications :

drawings may differ from products	Boundary Dimensions	d	420	mm
		D	560	mm
		B	437	mm
		T	437	mm
	Basic Load Ratings	Cr	7900	kN
	Basic Load Ratings	C0r	16300	kN
	Speed Ratings	Grease	220	rpm
	Speed Ratings	Oil	300	rpm
	Weight		298.00	kg

Features :

Product Type: Four-Row Tapered Roller Bearing

Model No.: 380684

1. Overview

Talking about the 380684 four-row tapered roller bearing: it’s a high-performance part made exclusively for heavy-duty machinery. It’s really good at handling heavy loads and impact loads, so it’s perfect for the key equipment we use in industrial work.

2. Basic Dimensions

Dimension Type	Value
Inner Diameter (d)	420mm
Outer Diameter (D)	560mm
Thickness (B)	437mm

3. Structural Features

Component Composition: For heavy-duty industrial applications requiring stable force distribution, the bearing adopts a composite structure with two double-raceway inner rings, one double-raceway outer ring, and two single-raceway outer rings.
Clearance Adjustment: In environments with varying working conditions, special spacers between inner and outer rings allow accurate adjustment of bearing clearance to maintain optimal performance.
Load-Bearing Advantage: For equipment demanding high load efficiency, structural optimization enables the bearing to simultaneously withstand large radial loads and certain axial loads, meeting rigorous industrial demands.

4. Load-Carrying Capacity

Radial Load Capacity: Boasting a 2.5–3.5x radial load capacity advantage over single-row tapered roller bearings, this bearing delivers guaranteed stable operation even in the most demanding high-load scenarios.
Load Type Adaptability: Unlike conventional bearings, it excels at combined radial-axial loads (radial as main force) and stands up to heavy/impact loads in harsh operating environments, making it a high-performance choice.

5. Performance Characteristics

Limiting Speed: Four-row tapered roller bearings create higher friction during operation due to structural characteristics, particularly the sliding contact between the rib and roller end. Hence, their limiting speed is relatively lower than that of other comparable-size bearings such as four-row cylindrical roller bearings.
Axial Load Capacity: Whereas single-row tapered roller bearings are limited to unidirectional axial load support, the four-row design is developed to resist heavy axial loads from both directions. This bidirectional performance guarantees precise axial positioning and efficiently absorbs rolling thrust. Importantly, it mainly undertakes heavy radial loads while providing bidirectional thrust capacity, ideal for rolling mill applications.

6. Material & Manufacturing

Component	Material
Inner & Outer Rings	Carburized Steel
Rolling Elements	Bearing Steel
Cage	Stamped Steel Plate

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

7. Application Fields

Primary Application: Rolling mill work/backup rolls (exclusive design) → fits European rolling mills’ high-precision, heavy-load standards.
Other Applications: Widely applied to heavy-duty equipment with high load/impact resistance demands: cranes, mining machinery, wind turbines.

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Subject :Low-speed heavy-load four-row tapered roller bearing 380684