Combined Slings apply external force directly to the end of the bolt through a hydraulic cylinder, Trailer Sling Color stretches the bolt to the desired length and lightly tightens the nut by hand to maintain the applied load. Combined Slings Color is not affected by bolt smoothness and thread collision, and the tensile method can be used to obtain more accurate bolt loads. In addition, Trailer Sling can also stretch multiple bolts at the same time. Usually, choose more than 2 synchronizers (1 pump and 2 stretchers), 4 synchronizers (1 pump and 4 stretchers), 8 synchronizers (1 pump and 8 stretchers), over the entire ring bolt The upper stretching method is especially suitable for the connection of key flanges and other connection accuracy requirements, which can make the flange force evenly connected and prevent leakage.