Specifications :

drawings may differ from products	Boundary Dimensions	d	400	mm
		D	540	mm
		B	400	mm
		T	400	mm
	Basic Load Ratings	Cr	6980	kN
	Basic Load Ratings	C0r	13300	kN
	Speed Ratings	Grease	240	rpm
	Speed Ratings	Oil	360	rpm
	Weight		262.00	kg

Features :

Product Type: Four-Row Tapered Roller Bearing

Model No.: 380680

1. Overview

Industrial applications rely on essential equipment that demands heavy and impact load resistance— the 380680 four-row tapered roller bearing, a high-performance part exclusive to heavy-duty machinery, is the perfect fit for this need.

2. Basic Dimensions

Dimension Type	Value
Inner Diameter (d)	400mm
Outer Diameter (D)	540mm
Thickness (B)	400mm

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) is a deliberate design choice that prioritizes stable force distribution— a critical foundation for reliable performance.
Clearance Adjustment: Unlike standard bearings, this model uses special spacers between inner and outer rings to accurately adjust clearance, ensuring it meets the unique demands of different working conditions.
Load-Bearing Advantage: Through targeted structural optimization, the bearing outperforms conventional alternatives by simultaneously withstanding large radial loads and certain axial loads, thereby elevating its overall load-bearing efficiency to a new level.

4. Load-Carrying Capacity

Radial Load Capacity: Its radial load capacity is approximately 2.5 to 3.5 times that of single-row tapered roller bearings, a key feature that guarantees stable operational performance under high-load working conditions.
Load Type Adaptability: It demonstrates superior proficiency in handling combined radial and axial loads—with radial loads as the primary force—and can endure heavy loads and impact loads in harsh operating settings.

5. Performance Characteristics

Limiting Speed: Lower limiting speed than four-row cylindrical roller bearings (structural constraints) — a deliberate trade-off to boost load-bearing capabilities.
Axial Load Capacity: Handles axial loads in both directions; usable as a bidirectional thrust bearing, effectively satisfying dual-directional axial load needs.

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: Tailored for rolling mill work rolls and backup rolls, ideal for European rolling mills’ high-precision, heavy-load needs.
Other Applications: Widely used in cranes, mining machinery, wind turbines and other heavy-duty equipment requiring strong high-load/impact resistance.

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Subject :four-row tapered roller bearing 380680