Improved screw lug

Abstract

The invention relates to a screw shank (1) for fixing pipes to a concrete surface, comprising a head (2) having a first thread (3) and a self-tapping cylindrical seat (4) having a second thread (5). According to the invention, the screw shank (1) has undergone a hardening treatment of the nitriding or carbonitriding type, and said cylindrical seat (4) has a nominal diameter of 5.5 mm. Figure for the abstract: Fig. 1

Claims

Demands

1. Screw shank (1) for fixing pipes to a concrete surface, comprising a head (2) having a first thread (3) and a self-tapping cylindrical seat (4) having a second thread (5), characterized in that the screw shank (1) has undergone a hardening treatment of the nitriding or carbonitriding type, and said cylindrical seat (4) has a nominal diameter of 5.5 mm.

2. Screw lug (1) according to claim 1, characterized in that the head (2) has a nominal diameter of 7 mm.

3. Screw tab (1) according to any one of the preceding claims, characterized in that the head (2) has a six-pointed star-shaped indentation (6).

4. Screw lug (1) according to any one of the preceding claims, characterized in that the length of the cylindrical bearing surface (4) is 42 mm.

5. Screw lug (1) according to any one of the preceding claims, characterized in that the thread pitch of the self-tapping threaded cylindrical seat (4) is 2.6 mm.

6. Screw lug (1) according to any one of the preceding claims, characterized in that the angle of the thread profile of the bearing and / or the angle of the thread profile of the head (2) is 40°.

7. Screw lug (1) according to any one of the preceding claims, characterized in that the screw lug (1) is provided with a base (7) separating the head (2) from the cylindrical bearing (4).

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