Coaxial connector manufactured with minimum protective metal coating treatment

A coaxial connector, having a central axis and comprising:

• a metal casing, comprising a housing surrounding the central shaft to define an accommodation space, and a plurality of contact arms connected to the housing, the housing having a front housing surface and a rear housing surface, the rear housing surface having a non-antioxidation-treated surface portion, and the plurality of contact arms being connected to the front housing surface and surrounding the central shaft in a manner spaced apart from each other;
• an insulation body, disposed in the accommodation space and surrounding the central axis to define a positioning hole, the insulation body comprising a front end surface, an insertion slot recessed from the rear end surface toward the front end surface along the central axis and in communication with the positioning hole, and a wall covering portion extending radially from a position near the rear end surface to cover the non-antioxidation-treated surface portion;
• and
• a central terminal, passing through the positioning hole and comprising a first contact end portion adjacent to the plurality of contact arms and a second contact end portion located at the insertion slot,
• wherein the housing further comprises a notch,
• wherein the non-antioxidation-treated surface portion is located in the notch,
• wherein the wall covering portion extends into the notch and covers the non-antioxidation-treated surface portion, and
• wherein the contour of the wall covering portion matches the contour of the notch.