Expansion bolts consist of countersunk bolts, expansion tubes, flat washers, spring washers, and hexagonal nuts.
Expansion screw is a commonly used method of fixing bolts, suitable for various materials such as concrete, aluminum alloy, steel, etc. It has the characteristics of high fixing force and convenient use. The expansion screw is composed of a screw and a wedge-shaped slope, which is fixed in the hole through a variable diameter, making it more secure than ordinary bolts.