BMW 5 Series Owners & Service Manuals

BMW 5 Series: Body overview, Body structure

Body overview

G30 Side frame structure

  1. Multiphase steel (> 300 N/mm²)
  2. Ultra-high-strength steel (> 900 N/mm²)
  3. Aluminum
  4. Deep-drawing steel (< 300 N/mm²)
  5. Other steel grades
  1. Inner roof frame
  2. Roof frame reinforcement
  3. B-pillar reinforcement
  4. Side sill reinforcement plate
  5. Outer side frame (deep-drawing steel)

Body structure

The lightweight body construction concept of the G30 comprises high-strength steel and Aluminum components. There is no Carbon Core used in the construction of the G30 body like in the G12. The use of die-cast Aluminum components has increased significantly. Thanks to the material mix, the materials are able to contribute their specific strengths to the vehicle in the best possible way. As a result of the strict lightweight construction philosophy, the weight of the body has been reduced by around 46 kg / 101 lbs over the predecessor F10, but crash safety has been further improved.


G30 Ultra-high-strength steels in the body structure

  1. Carrier support, bulkhead
  2. Inner side frame
  3. Engine support extension
  4. Reinforcement plate, B-pillar
  5. Side sill reinforcement plate
  6. Outer connecting plate


The use of Aluminum extruded profiles and complex die-cast Aluminum parts accounts for a rigid body along with low weight. All requirements relating to passive safety are also met.

The spring strut domes on the front, and for the first time also on the rear, are manufactured using the Aluminum pressure die casting process. As is already familiar from the G12, the side members at the rear are now also made as die-cast Aluminum components. This contributes to excellent weight distribution in the body structure. New Aluminum cast alloys were also developed in order to increase the crash safety of these components.

G30 Aluminum in the body structure

  1. Front spring strut dome
  2. Rear spring strut dome
  3. Side member
  4. Engine support


     Screw connections

    Some of the Aluminum-steel connections in the G30 body structure are produced using a new body joining technique: flow drill screws. These include, for example, the connection between the engine sup

     Body Repair Level 1

     Repair Level 1

    Taking into account the repair stages of the BMW workshop information system, the body repair work in the Technical Qualification is divided into 3 repair levels. Each of the 3 Body Repair Levels in


     Concept, General information, Safety information

    Concept The system helps to avoid imminent side collisions. General information Four radar sensors in the bumpers monitor the area next to the vehicle in the speed range from approx. 45 mph/70 km/h to approx. 130 mph/210 km/h. The front camera determines the lane marking positions. If, for instan

     Functional prerequisites

    The following prerequisites must be met in order for the Active Lane Keeping Assistant and Traffic Jam Assistant to be used: Speed must be below 130 mph (210 km/h). Above 43 mph (70 km/h): both lane edges must be detected. Below 43 mph (70 km/h): both lane edges or a vehicle driv

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