First, the bolt specifications

If you do not say how much nuts, according to the metric bolts and nuts on the opposite side of the sleeve, M36 in the nut on the other side of the hexagonal 55, M42 is 65, M48 is 75.

If the bolt size is too large, and the torque span is large, it is necessary to use two types of wrenches.

 

Second, the bolt torque

Different bolts, the same bolt strength grade different torque, the same bolt strength level, the torque of different working conditions are different for rolling mill equipment and chemical equipment on the bolt torque is not the same, the general design drawings will give Torque size, or the corresponding standard number.

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Third, the bolt, nut space position

If there is no space limit, then any type of wrench can be used.

If the thread is too long or the upper space is limited, it is best to use a hollow hydraulic wrench; if the distance between the nuts is narrow, a hollow hydraulic wrench can be used.

 

Fourth, other considerations

1) a type of hydraulic wrench, can only solve several similar bolts, generally with 1-10 sleeves;

2) conditional manufacturers is best to use an electric pump with two wrenches to use, diagonal use, can improve efficiency, torque more accurate;

3) hydraulic wrench must be used by hand, hand custody, regular maintenance, such as oil change, cleaning and so on;

4) bolt torque standards should be subject to national standards, the national standard is in line with China's national conditions.

5) Drive hydraulic wrench is the most economical.