It should have a sufficient swing angle to meet the requirements of the wheels jumping up and down;
Small friction torque is an important factor to ensure the ease of steering and easy handling;
There should be no gaps causing wheel shimmy and abnormal noise;
Good sealing performance to ensure that the ball head pin can be used normally in muddy water and high and low temperature environments;
It should have sufficient strength and durability to withstand the forces and vibrations from the wheels.