Die for, method of making, and fastener with lobed primary...

Details Die for, method of making, and fastener with lobed primary... Die for, method of making, and fastener with lobed primary...

2007-01-02

2007-01-02

Mitchell, Katherine (Department: 3677)

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

Externally threaded fastener element, e.g., bolt, screw, etc.

Thread or shank structure

C411S412000, C411S416000, C411S308000, C072S103000, C072S088000, C470S185000, C470S066000, C470S070000, C470S010000

Reexamination Certificate

active

10845461

ABSTRACT:
A threaded fastener comprises a first, primary thread lead, and a pair of second, auxiliary thread leads alternatively interposed between successive threads of the first, primary thread lead, except within the vicinity of the tip portion of the fastener so as to define space for accommodating debris generated during the self-tapping of the fastener into a workpiece. The fastener also comprises lobe members formed upon the primary thread lead so as to predeterminedly affect torque insertion and pull-out resistance values.

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