Model & Structure: Metric 380000 series; consists of two sets of double-row inner assemblies + two separate outer rings, detachable; Four rows of tapered rollers arranged symmetrically.

Load Characteristics: Capable of withstanding extra-heavy radial loads + bidirectional axial loads, extremely strong impact and overturning moment resistance; Designed exclusively for heavy-duty applications, very low limiting speed.

Core Advantages: Four rows of rollers share the load, resulting in low unit contact pressure, load capacity far exceeding single-row and double-row tapered roller bearings; Single assembly provides bidirectional axial positioning, eliminating the need for multiple bearing sets; Extremely high rigidity, rolling mills maintain deformation-free operation under heavy loads.

Disadvantages: Large size, heavy weight, high cost; No self-aligning capability, requires strict coaxiality between shaft and bearing housing; Low speed, not suitable for high-speed operation; Complex clearance adjustment.

Comparison with Other Tapered Roller Bearings: Single-row: Unidirectional axial force only, smallest load capacity; Double-row: Bidirectional load capacity, medium-heavy load; Four-row: Maximum load capacity, specifically designed for ultra-heavy rolling mills.

Typical Applications: Hot and cold rolling mill rolls, large plate rolling mills, seamless steel tube mills, heavy calendering equipment.

Usage Guidelines: Installation requires precise axial clearance control; High machining accuracy required for housings and roll shafts, even slight eccentricity can easily cause roller burning; Low-speed heavy-load conditions require adequate high-pressure lubrication and cooling.