Car Pillar

Car Pillar: What is A/B/C/D of the Vehicle’s Body?


 | 5 minutes read

Which are the types of car pillars?

The body of an automobile is made of a structure that is just the same as that of a house. It has similar components, which include the roof, the pillars, and the floor. The car pillar in the vehicle stands in the near-vertical position, which supports the vehicle’s roof. However, the A-pillar and the D pillar stand inclined in some vehicles for aerodynamic reasons.

Vehicle Pillars
Vehicle Pillars

Furthermore, the manufacturers identify the car pillars from the side while moving from front to rear of the vehicle. They name the car pillars as the A-pillar, B pillar, C pillar, and D pillar. Sometimes, the vehicle designers also refer to the car pillars as 'posts.'

Why call them the A/B/C/D Pillar?

The naming system adopted for the pillars possibly originates from their shapes as seen from sides. The A-pillar resembles the shape of the alphabet “A”.

A-Pillar
A-Pillar
A-Pillar of a Cab/Ute
A-Pillar of a Cab/Ute

The other pillars resemble “B,” “C,” and “D” letters, respectively. Is it a mere co-incidence or designer’s creativity? If the vehicle has a stretched body structure with additional doors, such as in the case of a limousine, it gets more than one B pillars. In such a case, the manufacturers name them as B1, B2, and B3 & so on while moving from front to rear of the vehicle. For example, rescue teams communicate the names of pillars (A/B/C/D) while cutting the pillars with cutters. Hence, the naming of pillars is important while rescuing the passengers trapped in accident-damaged vehicles.

Purpose of the Car Pillar A:

Manufacturers provide the A-pillars on both sides of the vehicle. The A-pillar is made of strong steel alloys. This is to make it withstand a crash and meet safety standards. However, the vehicle’s roof and doors are the most expensive parts to carry out repairs. The blind spot occurs due to the blocking of the driver’s vision by the A-pillar. So, some car-makers made the A-pillar slimmer and chamfered to decrease the blind spots. And, thus it improves the driver’s vision.

B Pillar:

Furthermore, B Pillar is the most complex component/structure of the vehicle body. This is because the front door closes on the B pillar while the rear door hinges onto it. The B pillar or the center pillar in vehicles is made of steel. It is welded to roof panel on top and the vehicle’s floor pan at the bottom. This pillar provides structural support to the vehicle’s roof.

Don't miss out on Automotive Knowledge