| 摘要 |
The particle board screw has a screw shaft (1), a screw top, a thread (3) extended over the screw shaft or in the screw top and a countersunk head (4). The countersunk head has milled brackets (8) at its lower side. The countersunk head has a triangular shape in a cross section by the screw. An angle between the front boundary wall (9) and the rear boundary wall of the milled bracket represents approximately 100 degree-110 degree in cross section through the screw longitudinal axis. |
