Profile: Shanghai Sawo Electrical and Mechanical Technology Co., Ltd is a manufacturer and supplier of in-line pipe severing & beveling machines and flange facing machine. IMF series flange facing machine is an internally mounted machine with a strong lightweight construction, which is designed for flange facing on site. Hydraulic bolt tensioner is an advanced bolt dismounting tool, especially suitable for connecting and fastening several bolts of the same specification. It changes traditional methods, by using hydraulic system to stretch fastening bolts in order to reach pre-determined load, and then automatically be locked in fasteners.