It usually includes a screw, a screw head fixed at one end of the screw, and a drilling thread set on the screw. Its characteristic is that the drilling thread includes a first thread and a second thread that are sequentially arranged on the surface of the screw along the length direction of the screw. The two threads have equal pitch and rotation direction, but the thread heights are not equal. The thread height is lower near the front end, and the trajectory of the second thread is set between adjacent threads of the first thread.
The advantages of this design include: when entering wooden materials, the drilling threads with higher thread heights can reconstruct the trajectory of the drilling threads drilled by the drilling threads with lower thread heights, thereby improving the stability of the wooden screw fixation. Drilling threads with lower thread height are more likely to penetrate wooden materials, providing greater space for drilling threads with higher thread height, sharing the pressure of the thread, and avoiding damage to the drilling threads.
In addition, there is a double threaded easy to attack wood screw, which has a first thread on the circumference of the first fixing rod, a first groove symmetrically opened on the outer side for accommodating wood chips, a second fixing rod with a triangular cross-section on the lower side, a second thread on the circumference, a third fixing rod with a third thread on the upper side, a fixing plate on the upper side of the third fixing rod, and a second groove with a hexagonal cross-section on the upper side of the fixing plate. This design can prevent wood chips from lingering between the first thread gap and damaging the wooden material, while also allowing the wood screws to be nailed into the wooden material more quickly, increasing stability.
There is also a type of double threaded screw suitable for connecting rings, which has a first threaded section and a second threaded section at both ends of the rod body. The end diameter of the second threaded section is larger than that of the first threaded section. In this way, while the second threaded section is fastened to the inner wall of the sleeve, the first threaded section can be inserted into the sleeve for wiring, providing dual protection for the connection between the screw and the sleeve. Even if the first threaded section loosens from the wiring inside the sleeve, the fastening connection between the second threaded section and the sleeve can prevent the wiring from falling out of the sleeve, thereby avoiding the occurrence of leakage and greatly improving the safety of electrical wiring products. A connecting section can also be set between the first threaded section and the second threaded section to increase the insertion distance of the first threaded section into the sleeve, facilitating wiring. A gasket can also be installed on the connecting section.
Post time: Jul-16-2024