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source:Industry News release time:2022-03-15 Article author:Rosit Popular:Air band saw
1. Specifications of bolts
If you don't say how big the nut is, it is according to the opposite side of the metric bolt and nut pairing cylinder. The hexagon opposite side of the nut for M36 is 55, M42 is 65, and M48 is 75.
If the bolt specification span is too large and the torque span is large, then two types of wrenches must be selected.
2. Bolt torque
Different bolts have different torques, the same bolt strength grades have different torques, and the same bolt strength grades have different torques under different working conditions. The bolt torques used in rolling mill equipment and chemical equipment are different, and general design drawings will be given. Torque size, or the corresponding standard number.
3. Spatial position of bolts and nuts
If there are no space constraints, any type of wrench can be used.
If the exposed thread after screwing is long or the space above 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.
4. Other matters needing attention
1) One type of hydraulic wrench can only solve several similar bolts, generally with 1-10 sockets;
2) For qualified manufacturers, it is best to use an electric pump with two wrench heads, and use it diagonally, which can improve the efficiency and the torque is more accurate;
3) The hydraulic wrench must be used, kept and maintained regularly, such as oil change, cleaning, etc.;
4) The bolt torque standard should be subject to the national standard, which is in line with China's national conditions.
5) Driven hydraulic wrench is the most economical.
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