Abstract: A sliding door mounting assembly for slidably mounting a door panel to an overhead track. The sliding door mounting assembly includes a hanging bracket member and an anti-derailing pin. The hanging bracket member is securable to the door panel, slidably engageable with the track, and has a channel extending therethrough. The anti-derailing pin has an outer surface with at least one tooth protruding outwardly therefrom, is insertable in the channel and is configurable in an anti-derailing position where at least one of the teeth is engaged with the hanging bracket member and a leading end of the anti-derailing pin abuts the track, preventing the hanging bracket member having the door panel secured thereto from derailing from the track.