The present invention relates to an improved nail structure for use in humerus fractures. In particular, the invention relates to a nailing system that provides safe distal locking without using a guide or fluoroscopy and without injuring the radial, median and musculocutaneous nerves. The invention is an intramedullary nail that contributes to the rotational stability and easy advancement to the proximal of the olecranon fossa thanks to its distal anterior inclination of 5°–40°, and the pin system (Endopin) that is screwed from the proximal to the inner part of the nail through the same incision and then exits from the oval hole in the distal posterior of the nail (Endopin) and It includes their auxiliary apparatus. With the clinical, biomechanical and anatomical cadaver studies on the subject, it has been shown that the humerus internal locking nail can be applied safely and provide sufficient stability in the fixation of humeral fractures.