A hybrid transmission component for a gas turbine engine has a composite body, and a metallic coupling joined with the composite body and defining a longitudinal axis along its length. The metallic coupling includes a plurality of spline teeth extending from a circumferential surface and angularly separated from each other about the longitudinal axis. Each spline tooth from the plurality of spline teeth extends radially from a root to a tip with respect to the longitudinal axis and extends axially from the leading end along the longitudinal axis. The leading end of each spline tooth includes a curved surface extending from the root and a planar surface extending from the curved surface to the tip. The planar surface is inclined obliquely to the longitudinal axis by a rake angle.

A turbomachine includes a housing assembly having a first housing member with a shroud surface, a bearing housing, and a second housing member. The turbomachine further includes a bearing that supports rotation of a rotating group within the housing assembly. The first housing member has a first axial surface and the bearing housing has a second axial surface that is substantially flush with the first axial surface. The second housing member has a third axial surface facing in an axial direction opposite that of the first and second axial surfaces. The first housing member has a first radial surface and the bearing housing has a second radial surface. The first housing member and the bearing housing are attached to the second housing member. The first and second axial surfaces abut against the third axial surface, and the first radial surface abutting against the second radial surface.