Tubular coupling

A coupler for connecting together a first tubular and a second tubular, the coupler comprising:

• a body having a first axial side and a second axial side;
• a first connector configured to connect to the first tubular, the first connector extending from the first axial side, the first connector defining a radially-facing sealing surface;
• and
• a second connector configured to connect to the second tubular, the second connector extending from the second axial side, the second connector defining a radially-facing sealing surface, and the first and second connectors being in fluid communication with one another through the body,
• wherein the first connector comprises internal threads configured to engage external threads on the first tubular, and wherein the internal and external threads have a ratio of thread height to pitch of between about 0.10 and about 0.20.

A tubular connection, comprising:

• an inner body comprising a bore, external threads, a torque nose, and a radially-facing sealing surface;
• and
• an outer body comprising a bore in communication with the bore of the inner body, internal threads configured to engage the external threads of the inner body, a torque-stop surface that engages the torque nose, and a radially-facing sealing surface that forms a seal with the radially-facing sealing surface of the inner body,
• wherein a height of the external threads is between about 0.016 inches and about 0.038 inches, and wherein a height of the internal threads is between about 0.016 inches and about 0.038 inches.