An assembly of mated coaxial connectors includes: a first connector with a first central conductor extension and a first outer conductor extension having a free end portion; and a second connector with a second central conductor extension and a second outer conductor extension having an outer body and an inner body with a gap therebetween. The first central conductor extension engages the second central conductor extension. The free end portion of the first outer conductor extension fits within the gap of the second outer conductor extension, such that the inner body applies radially outward pressure to the first outer conductor extension. At least one of the first outer conductor extension and the second outer conductor extension includes a flex member that deflects during axial engagement of the first and second connectors to apply axial pressure to the other of the first outer conductor extension and the second outer conductor extension.