Abstract: The hasp prevents the door of a boxcar or a sea-going bin from accidentally opening. One end of the hasp is locked to the door jamb adjacent to the door. The other end has a U-shaped connector which is removable from the shank of the hasp so that it can be passed through an opening in a staple on the door in order to attach to connector to the door. The connector is reattached to the shank of the hasp by means of a key which passes through keyways in the connector and the shank. To discourage vandalism or theft, the key can only be removed from the keyways by destroying it either by means of a blow torch or by means of a special tool which is not available to the general public.