What are the technical requirements for screw spikes

Generally, screw spikes can be applied to fasten railway ties, sleepers or railway turnout and also they also can be used in conjunction with plastic ferrules, casted into concrete ties /sleepers.

Railroad turnouts are made up of many railway accessories, and in order to ensure safe driving, the quality of each railway accessory must be guaranteed. Screw spikes are also one of the many railway accessories. Special attention is also required when purchasing and selecting screw spikes. Only qualified spikes can guarantee the safety of driving. So what are the technical requirements for screw spikes?

The specifications as follow:

The material of the screw spike is Q235-A steel, and the technical requirements should meet the requirements of GB700.
The upper thread of the screw spike is M24, the basic size should meet the requirements of GB196, and the thread tolerance is made according to the 8g specified in GB197.

The lower thread of the screw spike is special M25.6×6-d24.0/25.6 thread, and the tooth height is 3.25-00.25mm.
The end of the screw spike is manufactured according to the provisions of GB2.

The forged burst crack on the surface of the screw spike round table is not allowed to extend to the shaft. The upper thread does not allow for bumps and burrs that prevent the thread gauge from being freely screwed in. It is not allowed to have incomplete double cusps, scratches and threads that affect the use. The lower thread should be neatly shaped, the thread is complete, and no cracks are allowed. The surface is not allowed to have dents, burrs, flash, burns and scales that affect the use.

The spiral spike should be subjected to the physical tensile test. When the load is 130kN, the screw spike should not be broken.