Abstract: An improved latching apparatus for an access opening cover member or door on a grain bin. When locked closed, the cover member engages the adjacent wall of the grain bin to integrate the cover member with the grain bin wall to thereby enable hoop stresses caused by the weight of grain being stored in the bin to pass through the cover member. Typically, a series of pins carried by the door frame engages openings in the edges of the cover member or door to structurally integrate the door into the bin. The integration of the cover member with the bin wall provides a greater structural integrity of the bin and cover member; however, due to the stresses placed upon the cover member and bin wall, the pins tend to bind, making it difficult to disengage and open the cover member.