2. The upper thread of rail screw spikes is M24, the basic size should comply with the regulations of GB196, and the thread tolerance is manufactured according to the 8g stipulated in GB197.
3. The lower thread of rail screw spikes is special M25. 6×6-d24.0/25.6 thread, the tooth height is 3.25-00.25mm.
4. The end of rail screw spikes is manufactured according to GB2.
5. Forged burst cracks on the surface of rail screw spikes are not allowed to extend to the shaft. The upper thread of rail screw spikes is not allowed to have bruises and burrs that hinder the free screwing of the thread gauge, and it is not allowed to have double tines, scratches and incomplete threads that affect the use. The lower thread of rail screw spikes should be neatly shaped, and the thread should be intact, and no splitting marks are allowed. The surface of the rail screw spikes is not allowed to have dents, burrs, flashes, burns and oxide scales that affect the use.
Only quality rail screw spikes can be guaranteed. So after we understand the technical requirements, we must apply this knowledge when selecting rail screw spikes in the future. In this way, we can better ensure the selection of high-quality rail screw spikes. For more knowledge, please pay more attention to Kingrail Parts website: www.kirail.com