Composite drill screw
作者： Charles J Decaro
DOI:
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摘要: A composite drill screw comprises two components of different material joined together by an inertia weld. The first component is the head or and a portion threaded shank shank; whereas second cutting end remaining end, respectively. can be recessed to accommodate weld in that particular embodiment.
lens.org 参考文章(3)
Fred Brown, Self-drilling and tapping screw with lead unit ,(1969)
Loren L Whitney, Method of making slack adjuster screws ,(1925)
Richard A Walker, Bolt and method of making same ,(1969)