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1. The raw material of the straight thread sleeve is 45# carbon steel. If the straight thread sleeve encounters water, they would rust within ten minutes. So that it is important to do anti-corrosion for straight thread sleeve.
2. The straight thread sleeve is packaged in a film-attached bag. If the quality of the packaging bag is not good, the steel connecting sleeve will be corroded.
3. The connection sleeve packaging bag may damage during transportation, if it is rained or dampened, it would corrode.
4. During the storage of the straight thread sleeve, if it is in a wet and cold natural environment, it is very easy to corrode after a long time.
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