There are many kinds of automobile control arm screws, and the common ones include the following:

1. Standard screw: Standard screw is the most common type of control arm screw, and usually adopts threaded connection to fix the connection between the control arm and the vehicle chassis.

2. Bolt: A bolt is a threaded fixing piece, which is usually used together with a nut to connect the control arm and the vehicle chassis.

3. Screw: The screw is a threaded connector without nut, which is usually used to directly fix the control arm and the vehicle chassis, and the installation is simple.

4. Stud: Stud is a fixed part with external thread, which is usually used together with nut to connect the control arm and the vehicle chassis.

5. Nut: Nut is a part used for matching bolts or studs, and the control arm and the vehicle chassis are fixed through threaded connection.

6. Nut and bolt kit: The nut and bolt kit includes bolts and nuts, which are usually used as a set to connect the control arm and the vehicle chassis.

The above are the common types of automobile control arm screws. It is very important to choose the appropriate type of control arm screws according to the specific vehicle model and installation requirements. Different kinds of control arm screws have their own characteristics and uses, so they need to be selected and installed according to the actual situation to ensure the normal operation and safety performance of the automobile suspension system.