Screw with dual edge on thread

Details Screw with dual edge on thread Screw with dual edge on thread

F - Mech Eng,Light,Heat,Weapons

16

B

F16B 25/04 (2006.01) F16B 25/00 (2006.01) F16B 33/02 (2006.01)

Patent

CA 2707410

A screw fastener (1) having a head (H), threaded shank (S) with compound, divided threads (T) and tip end (P) has an upper thread surface extending at a substantially flat angle from a normal to a longitudinal axis (3) of the screw which diverts upwardly to a first peripheral edge defining a cupped or concave upper thread surface and a lower thread surface extending upwardly to a second peripheral edge, with a radially inward recess between first and second edges. The screw exhibits significantly increased pull-out resistance.

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