How to install the screws correctly?

Expansion screws installation method

The expansion screws into the ground or wall holes, with a wrench to tighten the expansion bolts on the nut, the bolt outward, while the outside of the metal sleeve is not moving, so the big head of the bolt underneath the metal sleeve rose open, so that it rises full of the entire hole, at this time, the expansion bolts can not be pumped out

Expansion screws are to make the air duct support, hangers, brackets are fixed in the A special threaded connector used on the wall, floor, column. By countersunk head bolts, expansion tube, flat washers, spring washers and hexagonal nuts. When used, the first impact drill (hammer) in the fixed body of the corresponding size of the hole, and then the bolt, the expansion tube into the hole, tighten the nut can make the bolt, the expansion tube, the mounting and the fixed body between the expansion of the body as a whole.　

Expansion Screws Fixing Principle Expansion screws are fixed by the use of the slope to promote the expansion of the friction generated by the friction grip, to achieve the fixed effect. One end of the screw is threaded, one end has a vertebrae. Outside the bread a tin, tin cylinder half of a number of cuts, they are thrown into the wall with a good hole, and then lock the nut, the mother of the screw to pull outward, the vertebral pull into the tin cylinder, tin cylinder was opened, so tightly fixed to the wall, generally used for guardrail, canopy, air-conditioning, etc. in the cement, brick and other only material on the fastening. But it is not very reliable, if the load has a large vibration, may occur loose, so do not recommend for the installation of ceiling fans and so on.