Specifications :

drawings may differ from products	Boundary Dimensions	d	280	mm
		D	420	mm
		B	250	mm
		T	250	mm
	Basic Load Ratings	Cr	1690	kN
	Basic Load Ratings	C0r	5300	kN
	Speed Ratings	Grease	420	rpm
	Speed Ratings	Oil	510	rpm
	Weight		119.00	kg

Features :

Product Type: Four-Row Tapered Roller Bearing

Model No.: 380656

1. Overview

The 380656 four-row tapered roller bearing, a high-performance component, is meticulously engineered for application in heavy-duty machinery. Its superior load-bearing capability, including resistance to heavy loads and impact loads, positions it as a perfect fit for key industrial equipment.

2. Basic Dimensions

Dimension Type	Value
Inner Diameter (d)	280mm
Outer Diameter (D)	420mm
Thickness (B)	250mm

3. Structural Features

Component Composition: 2 double-raceway inner rings, 1 double-raceway outer ring, 2 single-raceway outer rings.
Clearance Adjustment: Spacers between inner & outer rings for precise clearance tuning.
Load-Bearing Advantage: Structural optimization → simultaneous bearing of large radial + certain axial loads.

4. Load-Carrying Capacity

Radial Load Capacity: 2.5–3.5 times stronger than single-row tapered roller bearings, reliable under high-load conditions.
Load Type Adaptability: Performs well with combined radial-axial loads (radial main) and resists heavy/impact loads in harsh environments.

5. Performance Characteristics

Limiting Speed: Due to its structural features, particularly the sliding contact between the rib and roller end face, four-row tapered roller bearings generate increased friction during operation. As a result, their limiting speed is comparatively lower than other bearings of identical size, such as four-row cylindrical roller bearings.
Axial Load Capacity: In contrast to single-row tapered roller bearings, which only support unidirectional axial loads, the four-row configuration is engineered to resist heavy axial loads from both directions. This dual-direction capacity ensures accurate axial positioning of the shaft and efficiently manages the thrust produced during rolling. It is worth noting that while excelling in bidirectional thrust resistance, the bearing primarily carries heavy radial loads, making it highly suitable for complex combined load environments like rolling mills.

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: Work/Backup Rolls (Rolling Mills).
Secondary: Heavy-Duty Machinery (e.g., Cranes, Mining, Wind Turbines) requiring high & impact load resistance.

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Subject :High-capacity four-row tapered roller bearing for backup roll applications 380656