That is the call basket that the axles can connect to.I hope my answer will help you.
Silk flange "is the combination of two ways, is a way of separate connection, also is the tube flange threaded connection, flange is not welded on the pipe end, but with the threaded way connected to the pipe end.
Generally refers to the way of connection of pipe and pipe, which is divided into two kinds: the silk and the flanges. The silk mouth is the connection of the screw thread; The flanges are the two pipe ends which are connected by the two pipe ends, which are connected by a bolt in the hole.
