Patent Number: 6,250,866

Title: Self-drilling, self-tapping screw for concrete blocks

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.

Inventors: Devine; Richard C. (Southwick, MA)

Assignee: Olympic Manufacturing Group, Inc.

International Classification: F16B 25/10 (20060101); F16B 25/00 (20060101); F16B 025/00 (); F16B 035/04 ()

Expiration Date: 06/26/2018