Patent ID: 6846142

Claim:
Screw ( 1 ) made of plastic for screwing into a material of low strength having a screw shank ( 2 ) defining a minor diameter and a thread ( 6 ) having a certain pitch (P) and a large depth (H) as compared with the screw shank ( 2 ), the screw shank running out conically into a screw point ( 21 ), characterized by the screw having a main portion wherein any part of the main portion has the combination of the following features: 1. the depth of thread (H) and the minor diameter (Dk) of the thread form a quotient Q 1 =H/Dk in the order of magnitude of 1 to 3.5; 2. the minor diameter (Dk) and the thread pitch (P) form a quotient Q 2 =Dk/P in the order of magnitude of 0.3 to 0.6; 3. the thread ( 6 ) is designed as a V-thread having a vertex angle of the thread teeth of less than 30°.