From C919, Insights into China’s High-End Bolt Issues

The working principle of expansion bolts is actually quite simple: they utilize the expansion characteristics of the expansion sleeve to achieve fixation. When the bolt is tightened, the expansion sleeve expands outward, creating friction with the walls of the hole, thereby achieving a secure hold. This design gives expansion bolts excellent fixing performance on hard materials such as concrete and brick walls.

In practical applications, the selection of expansion bolts is crucial. First, the appropriate specification should be chosen based on the weight and load-bearing requirements of the object to be fixed. Generally, M6 is suitable for fixing lightweight items, M8-M12 for medium-weight applications, and M14 and above for heavy-duty equipment.

Second, the installation environment is also an important factor in selecting expansion bolts. In damp or corrosive environments, stainless steel expansion bolts are recommended to prevent rust and corrosion. In ordinary environments, galvanized carbon steel is sufficient.

When installing expansion bolts, there are several key steps to follow:

1. Drilling: The diameter of the drilled hole should match the specification of the expansion bolt, and the depth should be slightly longer than the bolt length.

2. Cleaning the hole: Before installation, thoroughly clean the hole of dust and debris to ensure proper expansion.

3. Inserting the bolt: Insert the expansion bolt into the hole, ensuring the expansion sleeve is fully seated.

4. Tightening the nut: Use a wrench to gradually tighten the nut until the expansion sleeve fully expands and makes tight contact with the hole wall.

5. Checking the fixation: After installation, check if the bolt is secure and perform a secondary tightening if necessary.

Expansion bolts have a wide range of applications, from home renovations to large-scale construction projects. In homes, they are commonly used to secure heavy items such as air conditioner outdoor units, water heaters, and wall-mounted TVs. In construction, they are used to fix steel structures, pipe supports, and equipment foundations.

However, expansion bolts also have some limitations. First, they are not suitable for soft materials like hollow bricks or drywall, as these materials cannot provide sufficient support. Second, in environments with frequent vibrations or impacts, expansion bolts may loosen over time and require regular inspection and maintenance.

In recent years, with advancements in construction technology, expansion bolts have also been continuously improved. Some new types of expansion bolts feature special sleeve designs that provide stronger fixing power on thinner materials. Others incorporate anti-loosening designs to maintain long-term stability in vibrating environments.

In summary, expansion bolts, as a simple yet effective fixing method, play an important role in our daily lives. As someone in the fastener industry, I deeply understand the importance of selecting the right expansion bolts and installing them correctly. I hope this article helps everyone better understand and use expansion bolts, making our lives safer and more convenient.

Finally, I remind everyone to always choose products from reputable manufacturers when purchasing expansion bolts and to carefully inspect the quality of the products. After all, a small bolt can be critical to the safety of an entire structure. Let us work together, with a professional eye and a rigorous attitude, to provide the most reliable security for every fixing point.