| 摘要 |
<p>The method involves forming a polygonal female pattern cavity on part of length of a barrel (2a). The cavity of a nut is cooperated with an existing metric type screw to constitute an assembly or a bolt, where the nut is M5 or M6 type nut. The cavity is formed at a base of the barrel. The cavity is of hexagonal section to receive the nut. An independent claim is also included for a plastic element in tender material presenting a barrel.</p> |
