Patent ID: 9567882
Date: 2017-02-14
CPC Classifications: B21J,B21K,F01M

Claim:
1. Method for producing a screw plug for an oil line or an oil vessel, the screw plug comprising a cylindrical tube stub ( 36 ) having an external thread ( 22 ), the tube stub ( 36 ) extending from a top plate ( 12 ) having a blind hole ( 28 ) of polygonal cross-section positioned centrally as a receiving member for a tool, the tube stub ( 36 ) having the external thread ( 22 ) and a blind hole ( 18 ) which is coaxial with the blind hole ( 28 ) of the top plate ( 12 ) and extends from an end face ( 16 ) of the tube stub ( 36 ), the screw plug being of metal material and comprising a bevelled portion ( 24 ), which is inclined from the top plate ( 12 ) towards a longitudinal axis of the screw plug, as a transition to the tube stub ( 36 ), the method comprising providing a blank ( expanding the tube stub ( wherein the external thread (