Patent 11168726 was granted and assigned to Textron on November, 2021 by the United States Patent and Trademark Office.
A fastener includes: a shaft having longitudinal axis and a first and second threaded portions, the first and second threaded portions separated by a central portion having a reduced diameter between the first and second threaded portions, and at least one of the first or second threaded portions is chamfered to reduce friction on leading threads.