Sheet metal screw

Details Sheet metal screw Sheet metal screw

1982-09-29

1985-05-14

Holko, Thomas J.

Expanded, threaded, driven, headed, tool-deformed, or locked-thr

Threaded fastener locked to a discreet structure

Nut, and means to engage substructure on its opposite faces...

411186, 411311, 411399, 411412, F16B 3930, F16B 502

Patent

active

045168938

ABSTRACT:
A rotary fastener for use in attaching sheet metal or attaching articles to sheet metal. The fastener has a serrated helical ramp forged in the undersurface of the head during the heading operation. The serrations have generally radially oriented surfaces which engage workpiece material to increase strip torque, removal torque or both. The ramp advances helically in an axial direction and the ramp is spiral in cross-section.

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