![]() ![]() As the anchor is driven into the hole, the pre-expanded part of the anchor continually pushes out against the walls of the hole, trying to regain their original shape. ![]() ![]() They have a head that prevents the anchor from being removed and are considered tamper-proof. Pre-expanded anchors only come in small diameters and only are suited for light-duty fastening applications. For example, if the base material is sandy and easily falls apart, then the holding values will be very low or nonexistent.īecause these anchors do not require any secondary tightening and require less time to install, the in place fastening cost is decreased. The holding values of any expansion anchor are only as good as the quality and quantity of the base material into which it is placed. Some expansion anchors can be used only in solid concrete others can be used in solid concrete, brick or block. The unexpanded expansion anchor requires the anchor to be set after it is installed into the predrilled hole in the masonry.Įach type of expansion anchors has base materials in which it works optimally. The pre-expanded expansion anchor is inserted in a predrilled hole compress and then exerts force to create the holding power. There are two kinds of expansion anchors pre-expanded and unexpanded. Expansion anchors are fasteners designed for use in masonry base material that provides holding power through expansion.
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