Threaded fastener
View Patent ↗A fastener includes a bolt including a head and a threaded shank including a bare section proximate the head, an end section having a wider end and having a plurality of alternate grooves and ridges, an intermediate section proximate the end section and having a spiral trough, and a threaded section between the intermediate section and the bare section; and a hollow member including a head member and a malleable shank having a plurality of holes. The end section is tapered toward the intermediate section at an angle of 3-degree to 8-degree.
1 . A fastener, comprising;
a bolt including a head and a threaded shank including a bare section proximate the head, an end section having a plurality of alternate grooves and ridges, an intermediate section proximate the end section and having a spiral trough, and a threaded section between the intermediate section and the bare section; and
a hollow member including a head member and a malleable shank having a plurality of holes;
wherein the end section is tapered toward the intermediate section at an angle of 3-degree to 8-degree.