Selection criteria for railroad spikes
The railroad spike, a seemingly inconspicuous railway accessory, actually plays a vital role. In the traffic network of roads and railways, it silently plays an important role in guiding the direction, preventing speeding and traffic accidents. Although the spiral railroad spike is not conspicuous in the entire turnout structure, its role cannot be ignored.
The material and specifications of the railroad spikes are crucial to their application and performance in railway turnouts. The selection of railroad spikes with suitable materials and specifications can ensure their excellent durability and stability during use, thereby ensuring the safety and smoothness of the railway. Therefore, when purchasing railroad spikes, we need to carefully consider the factors of materials and specifications to ensure that the selected railroad spikes can meet actual needs.
As a type of railroad spike, the screw rod is made of Q235-A steel, which strictly follows the technical standards of GB700.
The thread specification on the screw rod is M24, and its basic size must comply with the provisions of GB196. At the same time, the thread tolerance is controlled according to the 8g standard of GB197.
The surface of the screw must be intact and free of any dents, flashes, burrs, burns or oxides that may affect its use.
The manufacture of the threaded nail head must comply with the GB2 standard to ensure its quality and performance.
The threads on the lower part of the screw should be kept neat, the thread buckle must be complete, and there must be no splitting marks.
The threads on the upper part of the screw must also be complete, without scratches and burrs, to ensure that the screw can be screwed in freely, and the double tooth tips, scratches and screws must also be kept intact.
The threads on the lower part of the nail head adopt a special M25.6×6-d24.0/25.6 specification, and the tooth height is controlled within the range of 3.25-00.25mm.
There must be no forging cracks on the truncated cone surface of the spiral nail, and the cracks must not extend to the rod body.
All screws must undergo physical tensile tests, and the screws must not break when the load reaches 130kN.
