According to MT/T99-1997 standard and Yidong enterprise standard. The flat serrated chain link is in line with the national standard MT/T99-1997 standard. In the manufacturing process, high alloy steel containing Cr, Ti, Mn and other alloying elements and multiple heat treatment processes are selected to ensure that it (flat and vertical dual-purpose) matches perfectly with the supporting sprocket and operates safely. It is widely used in various specifications ring chain. The surface of the sawtooth ring is specially sprayed to extend the service life. Used for connecting vertical or horizontal mine ring chains, can also be used for other connections after agreement with Yidong.