Locking fluid fittings

A fluid conduit for a gas turbine engine comprising:

• a first fluid conduit attachable to a second fluid conduit along an axis;
• and
• a connector for securing the first fluid conduit to the second fluid conduit, the connector including a first portion including external threads;
• and a second portion receiving the first portion and including internal threads for mating to the external threads, the internal threads include lead threads defining a first thread interface with the external threads for starting attachment of the first portion to the second portion and locking threads defining a second thread interface for locking the first portion to the second portion.

A method of locking a fluid fitting comprising:

• defining a first coupling portion including external threads;
• defining a second coupling portion receiving the first portion and including internal threads for mating to the external threads, the internal threads include lead threads defining a first thread interface with the external threads for starting attachment of the first portion to the second portion and locking threads defining a second thread interface for locking the first portion to the second portion;
• and
• aligning the first coupling portion with the second coupling portion by engaging the externals threads the lead in threads;
• and
• locking the first coupling portion to the second coupling portion by engaging the external threads with the locking threads of the second coupling portion.