Specifications :

drawings may differ from products	Boundary Dimensions	d	380	mm
		D	620	mm
		B	388	mm
		T	388	mm
	Basic Load Ratings	Cr	3800	kN
	Basic Load Ratings	C0r	11600	kN
	Speed Ratings	Grease	240	rpm
	Speed Ratings	Oil	360	rpm
	Weight		443.00	kg

Features :

Product Type: Four-Row Tapered Roller Bearing

Model No.: 380676

1. Overview

What sets the 380676 four-row tapered roller bearing apart is its exclusive design for heavy-duty machinery and high-performance rating; its exceptional ability to withstand heavy and impact loads makes it the ideal choice for key industrial equipment.

2. Basic Dimensions

Dimension Type	Value
Inner Diameter (d)	380mm
Outer Diameter (D)	620mm
Thickness (B)	388mm

3. Structural Features

Component Composition: This bearing employs a composite structural design comprising two inner rings with double raceways, one outer ring with a double raceway, and two outer rings with single raceways, which effectively ensures the stable distribution of forces during operation.

Clearance Adjustment: Purpose-designed special spacers are strategically arranged between the inner and outer rings, enabling precise adjustment of the bearing clearance to satisfy the operational requirements of diverse working conditions.
Load-Bearing Advantage: By means of targeted structural optimization, the bearing has achieved the capability to withstand large radial loads and a certain magnitude of axial loads simultaneously, thereby significantly improving its overall load-bearing efficiency.

4. Load-Carrying Capacity

Radial Load Capacity: Radial load capacity is 2.5–3.5 times that of single-row tapered roller bearings, guaranteeing stable high-load operation.
Load Type Adaptability: Handles combined radial-axial loads (radial as main force) well and resists heavy/impact loads in harsh operating conditions.

5. Performance Characteristics

Limiting Speed: Structural characteristics, most notably the sliding contact between the rib and the roller end face, cause higher friction in four-row tapered roller bearings during operation. Therefore, their limiting speed is comparatively lower than that of four-row cylindrical roller bearings and other similar-size bearings.
Axial Load Capacity: In contrast to single-row tapered roller bearings with only unidirectional axial load capacity, the four-row structure is purpose-built to withstand heavy bidirectional axial loads. It ensures reliable axial positioning and effectively handles thrust generated during rolling. Importantly, it primarily carries heavy radial loads in complex load environments.

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: Quick update—specifically designed for rolling mill work/backup rolls, matches European rolling mills’ high-precision/heavy-load needs.
Other Applications: Widely used in cranes, mining machinery, wind turbines—heavy-duty equipment needing good high-load/impact load resistance.

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Subject :Impact-resistant four-row tapered roller bearing for harsh environments 380676