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Wedge Anchor Holding Values

When anchoring into concrete, wedge anchor is an excellent choice because of their holding values. The holding power of the wedge anchor, as with any anchor, is always dependent on the quality of the concrete. As a rule of thumb, a safety factor of 4:1 or 25%, is generally accepted as a safe working load. Holding values are also derived from the depth of the embedment- the deeper the embedment, the better the holding values. The wedge anchor must be embedded into the concrete up to or past the minimum embedment depth to obtain published holding values. It is also essential to ensure that the anchors are not placed too close together or too close to an unsupported edge.

The pressure exerted on the concrete by a wedge anchor can be best described as cone-shaped, with the small end of the cone being the inserted end of the anchor and the large end of the cone being at the surface of the concrete. If two wedge anchors are set too close together, the pressure from the two anchors could intersect, decreasing the holding values of both anchors. These same factors apply when placing an anchor near an unsupported edge. It is possible for the concrete to crumble under pressure if the anchor is placed too close to the unsupported edge.

The general recommendation is that an anchor should be placed no closer than five diameters from any unsupported edge. For example, a 1/2" diameter anchor should be at least 2-1/2" from any unsupported edge of concrete. Also, two anchors should never be set less than ten diameters from eachother. That is, two 1/2" diameter anchors should be placed at least 5" apart.

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