Expansion bolts are often used when fixing things on the wall at home. In addition, expansion bolts can be used for all things that are to be installed in cement, brick walls, and other places that are not easy to fix. Such as installing mechanical equipment, air conditioning shelves, stainless steel Doors, windows, etc. How to install and use it? Why can a small expansion bolt be tightly fixed in the wall? What is the state of the expansion bolt in the wall? Let’s take a look today.

When using expansion bolts, you must first use an electric drill (hammer) to drill the pre-drilled hole, then put the bolts and expansion lead sleeve into the holes, and tighten the nuts to make the bolts, expansion lead sleeve, and mounting parts match. The lead sleeve is expanded and tightened as a whole.

What is Expansion Bolt and How does it work?

The expansion bolts are composed of a bolt and an expansion lead sleeve, washer. The tail of the screw is conical, and the inner diameter of the cone is larger than the inner diameter of the expansion lead sleeve. When the nut is tightened, the screw moves outward, and the conical part moves through the axial movement of the thread, which in turn forms a large positive pressure on the outer peripheral surface of the expansion lead sleeve, and the angle of the cone is small, so that the wall and expansion lead sleeve, the cone Friction self-locking is formed, thereby achieving a fixed effect.

The spring washer on the expansion screw is a standard part. Because its opening is staggered and elastic, it is called a spring washer. The function of the spring washer is to use the sharp angle of the staggered opening to penetrate the nut and the flat washer to prevent the nut from loosening.

The flat washer is also a standard part, its function is to evenly distribute the pressure of the nut on the connected parts.

How to fix the expansion Bolt to the wall?

1. Use an electric drill to drill a hole in the wall, push in the expansion lead sleeve, and then rotate the screw with an electric drill to determine the required length

2. Punch a hole on the wall that is consistent with the expansion lead sleeve, put the screw into the hole, tighten the hexagonal nut with a wrench, and expand the tail to hang the wall after the expansion lead sleeve is stressed.

3. Use an electric drill to drill holes in the wall, then push in the hollow expansion bolts, and tighten the screws so that the expansion sleeve is stretched in place then withdraw the screws, and the screws pass through the mounting parts.

Performance class

The performance grade 10.9 high-strength expansion bolts, after heat treatment, can reach:

1. The nominal tensile strength of the expansion bolt material reaches 1000MPa;
2. The yield-strength ratio of the expansion bolt material is 0.9;
3. The nominal yield strength of the expansion bolt material is 1000×0.9=900MPa;

The meaning of performance grade of expansion bolts is an international standard. Expansion bolts of the same performance grade, regardless of the difference in material and origin, have the same performance, and only the performance grade can be selected in the design.

Expansion bolts are Widely used in various decoration occasions due to small drilling holes, large pulling force, and exposure after use. If not used, they can be removed at will and the advantages of keeping the wall flat.

Types Of Expansion Bolt

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