The Austem Rear Longitudinal Frame is a key structural component forming the rear backbone of the vehicle’s body in white (BIW). It is engineered to absorb and distribute impact energy during rear collisions, ensuring protection of occupant compartment integrity, and to maintain alignment between rear pillars, rear cross-members, suspension mounts, and trunk floor. Manufactured from advanced high-strength and ultra-high strength steel, the frame balances weight, stiffness, and crash performance. Austem uses CAE crash simulation, durability testing, and stress optimization to ensure that the rear longitudinal frame meets stringent global safety and performance standards while contributing to the overall body stiffness and ride stability.