| 摘要 |
A fastener is provided including an elongated body having a first end (1) and a second end (12), and a helical thread (20) formed on at least a portion of the elongated body where the thread has a crest (22), a root (25), and flank portions (28). The helical thread has at least one protrusion (50) extending from the crest and flank portions toward the first end of the elongated body, and each protrusion has a peak (52) that extends to the root of the thread. |
