It should be considered in combination with the later bearing capacity: 1. If the bearing capacity is about one ton, I-beam 16 is recommended. 2. If the bearing capacity exceeds three tons, then No.20 I-beam should be the first choice. If the specifications of I-beams are relatively small, but the later bearing capacity is large, the frame may collapse or deform at any time during use. When building a frame, we should consider safety and bearing capacity.

Second, what are the precautions for buying I-beams?

1. I-beams come in various specifications. Different specifications naturally lead to different scope of application. You can go to the local store to find out before buying, and then consider it in combination with actual use. I-beams 16 and 20, which are common in daily life, are also very convenient to buy.

2. Remember to choose I-beams produced by big manufacturers, so you don't need to worry about the quality of the products, and you can use them more safely. If the purchase quantity is relatively large, you can contact the manufacturer directly to buy. Without middlemen to make the difference, the price should be much cheaper and cost-effective for buyers.

3. When storing I-beams, try to put them in a dry place. If the surrounding environment is humid, it is easy to rust.