Product Type: Four-Row Tapered Roller Bearing

1. Overview

Engineered exclusively for heavy-duty machinery, the 3806/620 four-row tapered roller bearing is a high-performance component. It boasts outstanding capability to withstand heavy and impact loads, making it an ideal choice for core equipment across industrial fields.

---

2. Basic Dimensions

---

3. Structural Features

Component Composition: An advanced composite raceway structure (two double-raceway inner rings + one double-raceway outer ring + two single-raceway outer rings) provides a foundation for superior stability.
Clearance Adjustment: Precision spacers integrated between the inner and outer rings allow clearance to be adjusted flexibly, accommodating diverse operating conditions.
Load-Bearing Advantage: Thanks to structural optimization, the bearing offers outstanding load capacity — effortlessly managing high radial loads and selected axial loads in combination.

---

4. Load-Carrying Capacity

Radial Load Capacity: With 2.5–3.5 times the radial load capacity of single-row tapered roller bearings, it maintains stable reliability even under the most extreme heavy-load conditions.
Load Type Adaptability: It shows superior performance under combined radial and axial loads (radial loads as the dominant component) and stands up to heavy loads and impact forces in harsh conditions.

---

5. Performance Characteristics

Limiting Speed: The design of four-row tapered roller bearings, with sliding contact between the rib and roller end face, brings about increased operational friction. Accordingly, their limiting speed is relatively lower compared with other bearings of similar dimensions.
Axial Load Capacity: Although single-row tapered roller bearings can only resist axial loads in one direction, the four-row structure handles heavy axial loads from both directions reliably. This bidirectional performance ensures precise axial location and efficient absorption of rolling thrust. It is ideal for complicated industrial load environments such as rolling mills.

---

6. Material & Manufacturing

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

---

7. Application Fields

Primary Application: As the key bearing for rolling mill work rolls and backup rolls, it is well suited to the tough operating conditions of the rolling sector.
Other Applications: It can be widely applied to heavy machinery such as cranes, mining equipment and wind turbines, and performs reliably under high loads and impact loads.