| 摘要 |
<p>The present invention relates to a hybrid-type tapping stepped bolt assembly wherein a screw having a traditional tapping function is combined with a simple bolt for nut mounting. The tapping stepped bolt assembly according to the present invention comprises a bolt body. The bolt body comprises: a first screw unit having a first major diameter and a first pitch; a second screw unit which is connected to an upper portion of the first screw unit and has a second major diameter larger than the first major diameter; a head which is connected to an upper portion of the second screw unit and comprises a tool mounting unit; and a tapping unit formed on a lower end of the second screw unit.</p> |
