6Q0407621BR 6RD407621 6RD407621A all are the Reference number of Hub unit,and the supplier is vika. The detailed information is as follows:
Name: Hub unit
Reference OE number:6Q0407621BR 6RD407621 6RD407621A
Applicable models of 6Q0407621BR 6RD407621 6RD407621A
Audi：A1 11-19/A2 00-05
Grease: The Kyodoyushi AF-1 grease designed specifically for vehicle hub bearing is adopted. It functions well even in harsh environment conditions (-20℃~170℃). Extreme pressure agent and oxidation-resistant stabilizing agent have been added for improved load capacity and protection against softening and leakage.
Steel ball: Every steel ball is arranged in proper angles and positions to ensure uniform clearance with the ball bearing. The balls are able to rotate smoothly and not easy to wear in normal operation status.
High-frequency quenching process: The high-frequency quenched layer in inner and outer rings is 2.5-3.5 mm in depth. A long service life of bearings is achieved through strict control of quenching depth and the resulting hardness.
Thermal treatment process: A bainite steel process leads to higher toughness while suppressing rotation-induced cracks for longer durability.
Turning process: In a mud water design, mud water may be easily thrown out. In contrast, an automatic CNC turning process not only ensures smooth and tough tool patterns and uniform chamfer on component surfaces, but also leads to high dimensional accuracy and stability of each component.
Rolling process: Rolling in strict accordance with OE standards results in a surface finish degree of Rz0.2. It may serve as a substitute for corresponding thermal treatment process.
Thread: The threads with smooth surface are characterized by excellent self-locking and wear resistance, easy assembly, and high strength.
Gear broaching: The broaching tool moves from the groove bottom diameter, and completes forming operation in a single travel. As the required tolerance of guide teeth is ensured, the teeth can be installed more accurately.
Rotary riveting: The rotary riveting mouth has an arc shape generated through spinning in compliance with OE standard.