| 摘要 |
STAR FASTENER A star shaped fastener having at least five spaced vertical cups and edges about a central core with the included angle being ninety degrees reducing the fabricated material by: 50% and increasing the surface area by 15% compared to a common round nail of equal radius. The holding power is significantly enhanced by compression laterally and vertically into cups, shoulders or a taper of less than fourteen degrees. F8708002 |
