Self-tapping screw has central section on shaft in which pitch of thread increases in stages towards tip, after which it becomes constant again

申请公布号：DE102004029305(A1)

申请号：DE20041029305

申请日期：2004.06.17

申请公布日期：2006.02.02

申请人：

LUDWIG HETTICH & CO.

发明人：HETTICH, ULRICH

分类号：F16B25/00

主分类号：F16B25/00

摘要：<p>The self-tapping screw has a central section (II) on the shaft in which the pitch of the thread (b1 - b4) increases in stages towards the tip. It then becomes constant (a) again.</p>

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