| 摘要 |
An improved pin member adapted for use in a tubular connection where said pin member is adapted for coaxial threaded engagement with a box member having a counterbore for receiving the pin member. A pilot surface is disposed from a distal-proximate end to the distal end of the pin member inclining to a lesser extent than the angle of the incline of an internal sealing surface of the pin member. The pilot surface is substantially parallel to the axis of the connection. This pilot surface allows the end-of-pin flat thickness to be increased thereby allowing positioning of the interengaged threads so as to provide an increased radial thickness of the box member thereby increasing the axial tensile strength capability and burst pressure rating of said tubular connection while additionally protecting said internal surface of said pin member and providing a rugged end-of-pin flat. Additionally, a pilot surface is presented for the free end of a box member so as to provide additional protection of the external sealing surface of the box member and providing a more rugged end-of-box flat. |
