PLUG CONNECTOR

PROBLEM TO BE SOLVED: To reduce the maximum lateral section and to achieve high slating performance by improving a plug connector for connecting to a plug. SOLUTION: A connector comprises a casing which forms partially a cone 11, a hollow cylinder 12 having an external thread 121, a nut 5, a sealer 4, a cable 3 axially passing through the nut 5 and the sealer 4, a groove 14 receiving a seal 6, a ring 15 coaxially encompassing the plug at its end, and a contact insert 2 disposed within the casing. In the contact insert 2, four contact blade cramps are embedded, the contact insert 2 having axially a center hole, within which a screw 7 is disposed so as not to be lost, the contact insert 2 being secured by bayonet connection in the casing so as not to be rotatable, and not to be released without a tool.