V stay bar joints and ball joint interior structure

The invention relates to V stay bars (2) and ball joints (1) used on vehicles working under heavy load such as lorries, SEMI-TRAILER trucks, buses, providing connection of V stay bar (2) to ball joint body (10), wherein interior surface (11) of said body (10) comprising spherical surface (11.1) formed on the zone where sphere bearing (20) contacts, exterior surface (22.1) of lower zone (22) of said sphere bearing (20) having spherical form, bearing material (23) manufactured from CSB22 type of polyethylene material with high abrasion resistance and tab (12) that prevents sagging and leakage of sphere bearing (20).