Screw Spike and Surface Treatment

Update time:2014-03-17  Source: Dan  

Screw spike, or lag bolt, is a kind of railway fasterner which was first introduced in 1860 in France (French tire-fond), and became common in continental Europe. It is one of the most popular rigid rail fixation items.screw spike is a large metal screw used to fix a tie plate or fasten rail. Screw spikes are fixed into a hole bored in the sleeper.The screw spike has a higher cost to manufacture than the rail spike but has the advantage of greater fixing power; approximately twice that of a rail spike, and can be used in combination with spring washers.Screw spike


Surface treatment

There are mainy five type of screw spike 
Black coating.
Plating white zinc or yellow zinc (color-zinc).  
Salt spray test time:72 hours, non-rusting
3. Hot galvanizing.  
Salt spray test time:120 hours, 380hours, 500hours, non-rusting
4. Dacromet.   
Salt spray test time:120 hours, 380hours, 500hours, 1000hours, non-rusting
5. Black electric melting.  
Salt spray test time:120 hours, 380hours, 500hours, 1000hours, non-rusting


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