Hydraulic fitting insert

A hydraulic system comprising:

• a housing having a housing bore defined by a bore inner surface, wherein the bore inner surface has an internal thread formed thereon;
• and
• an insert having an insert body defining a longitudinal axis, and including a first end, and a second end opposite the first end, and having a flange formed adjacent the first end, an annular sealing feature formed adjacent the second end, and a cylindrical outer surface and a cylindrical inner surface extending between the first end and the second end, the cylindrical outer surface having an external buttress thread configured to mesh with the internal thread of the housing bore, wherein the sealing feature and the flange are configured to interface with the housing to provide a fluid seal,
• the sealing feature further including a concave inner curved surface adjacent to the second end, and a convex outer curved surface that is positioned opposite to the concave inner curved surface and extends from the external buttress thread to the second end, and the concave inner curved surface and the convex outer curved surface together forming a taper that narrows toward the second end,
• the convex outer curved surface forming a first slope in a radially outward to radially inward direction at a first location adjacent to the external buttress thread, and a second slope in the radially outward to radially inward direction at a second location adjacent to the second end, and wherein the second slope is steeper than the first slope, and
• the cylindrical inner surface and the cylindrical outer surface forming a radial thickness relative to the longitudinal axis, and the annular sealing feature being contained entirely within the radial thickness.