Engineers say that the M8 joint bolts are not tightened and can be caused by a number of reasons. In order to solve this problem, it needs to be carefully analyzed and measures taken accordingly.
The reason why the M8 joint bolts are not tightened.
Bolt or nut damage: Bolts or nuts may be worn, broken, or slippery, making them impossible to tighten.
Bolt-to-nut mismatch: Bolt-to-nut may not be tightly bonded due to mismatched specifications or incorrect models.
There are debris between the bolt and the hole: During the installation process, there may be dust, iron filings and other debris in the hole, which affects the tightening of the bolt.
Bolt-to-hole fit is too tight: If the bolt-to-hole fit is too tight, it can make the bolt difficult to screw in or tighten.
Improper heat treatment of bolts or nuts: Improper heat treatment of bolts or nuts may cause their hardness to be too low or too high, affecting their tightening performance.
In view of the above reasons that may cause the bolts of the M8 joint to be tightened, the following solutions can be taken:
Replace damaged bolts or nuts: If the bolts or nuts are worn, broken, or slippery, they should be replaced with new ones immediately. Make sure to use bolts and nuts of the correct size and model.
Clean up debris: Before installation, dust, iron filings and other debris in the holes should be carefully cleaned to ensure the cleanliness between the bolts and the holes.
Check the fit: During the installation process, the fit between the bolt and the hole should be checked to ensure that it fits well. If the fit is too tight, the size of the bolt or hole can be adjusted appropriately to make it more suitable.
Adjust the heat treatment process: If the heat treatment of the bolt or nut is improper, the heat treatment should be re-applied to ensure that its hardness meets the requirements. Pay attention to the process parameters of heat treatment, such as heating temperature, holding time, etc., to obtain good heat treatment results.
Use lubricant: When tightening bolts, you can apply an appropriate amount of lubricant between the bolts and nuts, such as engine oil, graphite, etc., to reduce friction and facilitate tightening. Be careful not to use too much lubricant so as not to affect the tightening between the bolt and nut.
Use a booster tool: In some cases, a booster tool can be used to help tighten the bolts. For example, using tools such as wrenches, hydraulic torque wrenches, etc., can increase the tightening torque and make the bolt easier to tighten. But be careful not to overexert force to avoid damaging the bolts or nuts.