Complementary contact and contact block designs are disclosed that help prevent movement of a contact received in the contact block when an electrical connector is press-fit or otherwise connected to a printed circuit board. A protrusion may be included on one or both beams of a dual beam contact, and a contact cavity may be formed in the contact block. The protrusion and the contact cavity may include complementary shapes such that the protrusion abuts a wall within the contact cavity, preventing the contact from moving relative to the contact block as the electrical connector is connected to a printed circuit board. The protrusion and a wall of the contact cavity additionally may include other complementary shapes (e.g., a radius or angle shape) such that a length of the protrusion abuts the contact cavity wall, providing a longer load bearing surface.