| 摘要 |
A fastener (10), with reference to Figure 2, includes a shank (100) having a first end and a second end. The fastener (10) includes a first thread (115, 120, 130) region (110, 112, 113) adjacent to the first end having a first helical thread (115, 120, 130) and a second helical thread (115, 120, 130) interposed with the first helical thread (115, 120, 130) in the first thread (115, 120, 130) region (110, 112, 113). A second thread (115, 120, 130) region (110, 112, 113) is provided adjacent to the first thread (115, 120, 130) region (110, 112, 113), the second thread (115, 120, 130) region (110, 112, 113) including only the second helical thread (115, 120, 130) with the second helical thread (115, 120, 130) having a diameter (H1, H2, R2) greater than a diameter (H1, H2, R2) of the first helical thread (115, 120, 130). A third thread (115, 120, 130) region (110, 112, 113) having a third helical thread (115, 120, 130) is provided extending from the second thread (115, 120, 130) region (110, 112, 113) toward the second end. A head (104, 140) is provided on the second end and includes a disk (140) and an octagonal boss (150) between the disk (140) and the third thread (115, 120, 130) region (110, 112, 113), the boss (150) including four major sides (142) extending perpendicular to the disk (140) and four chamfered sides (152). |
