Thread forming screw

Details Thread forming screw Thread forming screw

F - Mech Eng,Light,Heat,Weapons

16

B

F16B 25/00 (2006.01) B23G 5/06 (2006.01) B28D 1/14 (2006.01) F16B 39/30 (2006.01)

Patent

CA 2160890

A thread-forming screw that can be screwed directly into concrete, stone or the like has a screw head (11), a screw shank (12) and a thread (14) which extends at least partly over the length of the screw shank. The invention provides that the ratio of the outside diameter (d a) to the core diameter (d k) of the screw is about 1.25 to 1.5, the ratio of the outside diameter (d a) to pitch (p) is about 1.5 to 1.6, and the flank angle (.alpha.) of the thread (14) is less than 50° and at least 35°.

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