1. Bolt specification
Generally there are several specifications, such as M36, M42, M48, if not the size of the nut, according to the metric bolt nut pair matching BAIER fitting sleeve side, M36 in the hexagon nut side is 55, M42 is 65, M48 is 75. If the bolt specifications are too large, choose two types of wrench.
2. Bolt torque
Hangzhou naizhun precision machinery co., LTD. Torque size is the most key parameters choosing hydraulic wrench, different bolt torque is different, the same bolt material is qualitative different torque, torque of different working conditions, the same material is different also, used for rolling mill equipment and chemical equipment bolt torque is not the same, the general design of paper will be given torque size, such as not to give, give the corresponding standards, such as heavy machinery equipment is the gb, JB/T5000.10-2007, such as a 8.8 magnitude of M42 bolt torque of 2806 nm, M36 is 1749 nm, M48 is 4236 nm, all three of these bolts can choose a type of wrench.
3. Spatial location of bolts and nuts
If there is no space limit, which type of wrench can be used, the most economical driven hydraulic wrench; If the screw screw is long, the best is the hollow type hydraulic wrench, such as the bolt above the space is limited, the best is also the hollow type hydraulic wrench, such as the narrow distance between the nuts, can choose the drive type hydraulic wrench.