Abstract: A nut and bolt securing device is disclosed to prevent loosening of the assembly due to environmental conditions. In a first version of the invention the two piece device is fitted over a nut and a portion of a bolt extending from the nut, the two sections of the device being secured together with set screws, with serrations within the device, and one or more set screws engaging the front end of the device. In a second version of the device a shelf like planar projection on the front end of the device engages a planar surface on a nut, again combining with the serrations within the device to prevent fastener loosening. The device is particularly described in use in conjunction with refrigerant system flare nuts so as to prevent loss of refrigerant at these flare nut unions.

Abstract: A nut and bolt securing device is disclosed to prevent loosening of the assembly due to environmental conditions. In a first version of the invention the two piece device is fitted over a nut and a portion of a bolt extending from the nut, the two sections of the device being secured together with set screws, with serrations within the device, and one or more set screws engaging the front end of the device. In a second version of the device a shelf like planar projection on the front end of the device engages a planar surface on a nut, again combining with the serrations within the device to prevent fastener loosening. The device is particularly described in use in conjunction with refrigerant system flare nuts so as to prevent loss of refrigerant at these flare nut unions.

Abstract: A fluid tight flare nut union is described. Flare nut unions are convenient to install in systems, such as refrigeration systems, and are generally reliably fluid tight. Leaks can occur over time, however, due to environmental stress conditions. Deformable ferrules, in combination with compression nut assemblies, either singly, or redundantly, or in counter rotation redundant assembly, secure the flare nut to the fluid transfer tubing in a locking relationship which prevents the loosening of the flare nut-flare connection with subsequent fluid leakage due to these environmental stresses. Enclosing the complete assembly in water proof insulating material, further insures virtually leak proof operation of the improved flare nut union.