An electrical connector (10, 110) comprising: a shell (12, 112) having integrated contact receiving passages (26, 126) and an outer wall (24, 124) with a coupling ring retaining projection (36, 136), the coupling ring retaining projection (36, 136) comprising a front shoulder (38, 138) and a rear shoulder (40, 140); a coupling ring (14, 114) irremovably mounted on the shell (12, 112), the coupling ring (14, 114) comprising a mating face (50, 150), a rear face (52, 152), a circular inner wall (54, 154) and a circular outer wall (56, 156) between the mating face (50, 150) and the rear face (52, 152), the coupling ring (14, 114) being movable between a first position and a second position, wherein the coupling ring (14, 114) comprises a mating connector receiving portion (55, 155) and a shell receiving portion (57, 157), the shell receiving portion (57, 157) including a first locking projection (58, 158) extending from the inner wall (54, 154) in a direction away from the outer wall (56, 156) and positioned proximate to but spaced from the mating face (50, 150), the first locking projection (58, 158) including a first shoulder (60, 160); and a second locking projection extending from the inner wall (54, 154) of the shell receiving portion (57, 157) in a direction away from the outer wall (56, 156), the second locking projection including a second shoulder (64, 162), the second locking projection being positioned closer to the rear face (52, 152) than the first locking projection (58, 158); a spring integrally positioned on the shell receiving portion (57, 157) of the coupling ring, the spring being provided in a stressed position when the coupling ring is moved to the second position; a gap (67, 167) between the shell (12, 112) and the coupling ring (14, 114); wherein the first shoulder (60, 160) of the first locking projection (58, 158) of the shell receiving portion (57, 157) of the coupling ring (14, 114) cooperates with the front shoulder (38, 138) of the coupling ring retaining portion (36, 136) of the coupling ring receiving portion (32, 132) of the outer wall (24, 124) of the shell (12, 112); and the second shoulder of the second locking projection of the shell receiving portion (57, 157) of the coupling ring (14, 114) cooperates with the rear shoulder (40, 140) of the coupling ring retaining portion (36, 136) of the coupling ring receiving portion (32, 132) of the outer wall (24, 124) of the shell (12, 112) thereby to prevent removal of the coupling ring (14, 114)from the shell (12, 112) in the unstressed position. a shell (12, 112) having integrated contact receiving passages (26, 126) and an outer wall (24, 124) with a coupling ring retaining projection (36, 136), the coupling ring retaining projection (36, 136) comprising a front shoulder (38, 138) and a rear shoulder (40, 140); a coupling ring (14, 114) irremovably mounted on the shell (12, 112), the coupling ring (14, 114) comprising a mating face (50, 150), a rear face (52, 152), a circular inner wall (54, 154) and a circular outer wall (56, 156) between the mating face (50, 150) and the rear face (52, 152), the coupling ring (14, 114) being movable between a first position and a second position, wherein the coupling ring (14, 114) comprises a mating connector receiving portion (55, 155) and a shell receiving portion (57, 157), the shell receiving portion (57, 157) including a first locking projection (58, 158) extending from the inner wall (54, 154) in a direction away from the outer wall (56, 156) and positioned proximate to but spaced from the mating face (50, 150), the first locking projection (58, 158) including a first shoulder (60, 160); and a second locking projection extending from the inner wall (54, 154) of the shell receiving portion (57, 157) in a direction away from the outer wall (56, 156), the second locking projection including a second shoulder (64, 162), the second locking projection being positioned closer to the rear face (52, 152) than the first locking projection (58, 158); a spring integrally positioned on the shell receiving portion (57, 157) of the coupling ring, the spring being provided in a stressed position when the coupling ring is moved to the second position; a gap (67, 167) between the shell (12, 112) and the coupling ring (14, 114); wherein the first shoulder (60, 160) of the first locking projection (58, 158) of the shell receiving portion (57, 157) of the coupling ring (14, 114) cooperates with the front shoulder (38, 138) of the coupling ring retaining portion (36, 136) of the coupling ring receiving portion (32, 132) of the outer wall (24, 124) of the shell (12, 112); and the second shoulder of the second locking projection of the shell receiving portion (57, 157) of the coupling ring (14, 114) cooperates with the rear shoulder (40, 140) of the coupling ring retaining portion (36, 136) of the coupling ring receiving portion (32, 132) of the outer wall (24, 124) of the shell (12, 112) thereby to prevent removal of the coupling ring (14, 114)from the shell (12, 112) in the unstressed position.