A mechanical fastener assembly having a first member and an insert. The first member includes a cavity into which the insert is forced. The insert includes a body portion having a non-circular cross section defined by a plurality of arcuate sections. Forcing the insert into the first member, which may be a tubular member, firmly engages the insert with the first member. The first member is securable to a second member by positioning a portion of the first member within an opening in a second member. The opening in the second member may be configured to correspond to the cross sectional shape of the body portion of the insert. The body portion of the insert outwardly deforms the first member into engagement with the second member to thereby secure the assembly and prevent the relative axial and rotational movement between the insert, first member and second member.
