A header assembly includes a conductive outer housing holding a center contact and a dielectric body. The outer housing has a rear shell and an outer contact extending forward from the rear shell. The outer contact has a catch extending therefrom positioned forward of the rear shell. The header assembly includes a nose cone coupled to the outer contact. The nose cone is manufactured from a plastic material. The nose cone surrounds the outer contact. The nose cone has keying ribs along an exterior thereof. The nose cone has a latch engaging the catch to secure the nose cone to the outer housing.