Abstract: A sliding door assembly of the type at least partially formed from extruded material components wherein the assembly includes at least one movable panel and one stationary or fixed panel. The door assembly includes a lock assembly structured and positioned to be interconnected between portions of the two panels to prevent relative movement therebetween. Both of the panels are supported on a track assembly incorporating various components including a removable, snap-in threshold and a similarly removable track runner for support of the movable panels thereon.