Circular connectors

An electrical connector including a plug member having a body portion including openings for receiving first contact members and an outer shell surrounding and spaced from the body member,

• a receptacle member having a body portion including openings for receiving second contact members corresponding to and mating with the first contact members and with the receptacle including a shell portion extending from the body portion and with the shell portion of the receptacle received within the space between the outer shell and the body portion of the plug when the plug and receptacle are mated,
• the outer shell of the plug including at least one internal tab and with the thickness of the outer shell increased in the area of the internal tab and including a cutout area behind the internal tab and with all corner portions of the cutout area radiused,
• the shell portion of the receptacle including at least one undercut portion on the outer surface and with the undercut portion including a front face extending across the undercut, and
• the internal tab locking in the undercut portion at the front face when the plug and the receptacle are mated.