Self-locking threaded connection partially in non-locking engagement

A threaded connection comprising a first and a second tubular component, the first tubular component being provided with a pipe body and a male member at a distal end of the pipe body, the second tubular component being provided with another pipe body and a female member at a distal end of that pipe body, such that a male member comprises, on its external peripheral surface, at least one male threaded zone and finishes in a male terminal surface, and a female member comprises, on its internal peripheral surface, at least one female threaded zone and finishes in a female terminal surface,

• the male threaded zone comprising a male thread having a first portion in which the width of the thread root (WRp) decreases in a direction oriented from the male terminal surface towards the pipe body of the first tubular component, and a second portion adjacent to the first portion in which the width of the thread root remains at a minimum constant width value (WRpmin), the tooth closest to the male terminal surface presenting a maximum root width value (WRpmax) of the male thread, and
• the female threaded zone comprising a female thread having a first portion in which the width of the thread root (WRb) decreases along a direction oriented from the female terminal surface towards the pipe body of the second tubular component, and a second portion adjacent to the first portion in which the width of the thread root remains at a minimum constant width value (WRbmin), the tooth closest to the female terminal surface presenting a maximum root width value (WRbmax) of the female thread,
• wherein the first portions of the male thread and female thread are partially made up in a self-locking arrangement in order to provide a locking region in the threaded connection.