| 摘要 |
A fastener (100) includes a shank (102) having a diameter (D2) including a helical thread (125) and a cutting tip (116). The fastener (100) includes a head (140) having an integral washer (145) and nut (142). The washer (145) has a diameter (d) and a thickness (t), wherein a relation of the diameter to the thickness is established through a shape factor greater than 0.55, the shape factor for the thickness (t) greater than 0.06 inches being d*(l+2.5t)*t |
