Hitachi Pump Device,Hitachi Hydraulic Pump,Hitachi Main Valve Assy,Hitachi Control Valve JINING SHANTE SONGZHENG CONSTRUCTION MACHINERY CO.LTD , https://www.sdkomatsuloaderparts.com In the screw connection, when the threaded hole of one of the connected members has been processed, it is troublesome to determine the position of the light hole of the other connected member. An easy way to determine the position of a light hole is now presented. Select a few hexagon socket set screws that fit the threaded holes and machine them into the shape shown in Figure 1. Mounting part 1 to be processed into a light hole