A turbine blade (100) has a cooling channel (128) defined between a pressure sidewall (120) and a suction sidewall (122). A pin (132) is disposed in the cooling passage (128) and has a first end connected to the pressure side wall (120) and a second end connected to the suction side wall (122). A radially oriented groove having a maximum radius of curvature is disposed in a region of maximum fatigue loading along a circumference of at least one of the first end and the second end. An axially aligned groove having a maximum radius of curvature is disposed in a region of maximum impact loading along a circumference of at least one of the first end or the second end. The maximum radius of curvature of the axially aligned groove is greater than the maximum radius of curvature of the radially oriented groove.
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