Self-drilling, self-tapping screw for concrete blocks
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Jun 26, 2001
Grant Date -
N/A
app pub date -
Feb 11, 2000
filing date -
Feb 11, 2000
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A self-drilling, self-tapping screw for concrete blocks which includes a shank having a proximal portion equipped with a double lead, self-tapping spiral thread and an unthreaded portion which connects the threaded shank portion to a carbide drill tip in an axially spaced relationship. The length of the unthreaded portion of the shank is selected to allow the drill tip to form a clearance hole extending through the concrete block prior to engagement of the threaded shank portion with the clearance hole.
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