What is an expansion screw?

The extension consists of a bolt, nut and lead sleeve assembly, which extends after tightening. These screws anchor in materials that do not allow reliable thread formation such as concrete, brick and the like. Although there are similar nail anchors with expanding nylon sleeves, expansion screws are used in heavy applications such as providing benches and sitting stadium. There are several different configurations.

In configuration Bolt -lead Smeeve -Tapered necessary , the tapering matrix lies in the lead sleeve. This whole component is inserted into a pre -filled hole. The screw is then inserted and after attaching the bevelled nut is attracted to the head head, causing the lead of the lead housing. This type rests with a metal cone and sleeve on the screw assembly. When the screw is tightened, the pressure forces the metal cone into the guide and this expansion ensures the bolt in place. Configuration cones -sroub -lead smeeve - metal - necessary , although similar previous assembly, withIt relies on the tapering head of the screw - not the matrix - causes the lead sleeve to expand.

The

lead case is a common factor combining different types of configurations expanding screws. Lead is tradable, so it easily fills the drilled space in which it is set. Also due to the sleeve of lead, expansion screws allow minimal risk of cracking or breaking anchor material, as the expansion screws do not rely on individual connection points. The risk of pulling or stripping is also reduced by lead sleeves.

Depending on the diameter of the screw and the materials in which the screws are tested, the expansion screws can be evaluated under 0.5 inches (12.7 mm). Specifications can be found to expand NSion screws and correct tolerance should be selected based on the use and risk of corrosion. If there is a high probability of continuing water exposure, cadmium can be added,Transient metal-12 metal with similar anticorrosive properties to zinc to help expansion bolt resistance to moisture.

In the United States, the American National Standard Institute (ANSI) Mandate, among other things, standard and metric sizes and types of drives-grit, hex, double-hex, etc.-mold parts. You will find different sizes and types of assemblies of screws that suit any need. The expansion screws and their unrivaled components are made of steel and are plated according to the standards and specifications of the American Society for Testing and Materials (ASTM).