| 摘要 |
A selectively hardened nail (10) includes a nail head (12), an elongated shank (14), and a tip (16). A portion (15) of the nail shank (14) is made harder than the remainder by selectively heat treating that portion, and cooling it. The nail has controlled bending properties. The selectively hardened portion does not significantly bend when the nail (10) is fired at a surface using a power driving tool, or during use of the nailed object. <IMAGE> |
