This is a true fastener, not an anchor SELF-THREADING CONCRETE ANCHOR GUIDE HOW ANCHORS WORK Set with a hammering action.The primary difference between concrete anchors is whether the anchor is male or female. Uses the mechanical advantage of screw threads to obtain high expansion pressure. Bolt Size/ Hole Size Types Shell Types Set with a wrench. Zinc anchors are malleable and compress under high loads. The Most Common Types of Concrete Anchorsbolt size/hole size.

Here are the 7 most common types of concrete anchors.1. A setting tool is required to spot the hole for a female anchor.Anchors also differ by a host of other considerations. The fixture is then placed over the hole, and a bolt is inserted through the fixture and into the hole where it is received by the anchor. Design resistance loads for tensile and.Female anchors are inserted into a hole drilled into the concrete.

Holes drilled into the concrete for a wedge anchor should be equal to the anchorвЂ™s diameter size. Heavier-duty seismic wedge anchors are used in areas frequented by seismic activity.A couple of things to keep in mind regarding wedge anchors: Wedge anchors are usually a good option for heavy load or heavy shear applications. It is actually a stud constructed of two adjoined piecesвЂ”one piece threaded at the top end, and the other end consisting of a mechanism that includes a clip and the wedges that expand between the stud and the wall of the hole in the concrete.

The necked-down portion of the tool is inserted into the drop-in anchor and tapped with a hammer until the lip of the anchor meets the lip of the setting tool. The expander plug at the anchorвЂ™s base is set using a setting tool which is essentially a steel rod with one end necked down. Drop-In Concrete Anchor: Sometimes confused with wedge anchors because they expand similarly, drop-in anchors are female anchors that are placed in a pre-drilled hole.

An anchor screwВ is threaded through the fixture and into the hole and base. Machine Screw Anchor: A female anchor, this type of fastener consists of a cylindrical base inserted (or tapped with a hammer) into a pre-drilled hole in concrete, brick, mortar, or stone. Sleeve anchors can be used in concrete, brick, or stone.4. The action of turning the nut on the bolt pulls the bolt up through the sleeve, causing the sleeve to flare out up to в…›', thereby creating the necessary hold. The anchor is threaded through the fixture and into the pre-drilled hole in the concrete, brick, mortar, or stone. Concrete Sleeve Anchor: Sleeve anchors are male fasteners that consist of a threaded bolt enveloped by an expander sleeve at the top end, and a nut and washer at the other end.

The strike anchor is an impact expansion fastener consisting of a tubular body capped by a drive pin that extends from the tubular casing. Strike Anchor (AKA hammer drive, hammer set, metal hit, or hammer drive pinВ anchor): This is a male fastener used to attach relatively lightweight fixturesвЂ”such as shelf brackets, conduit, and electrical boxesвЂ”to solid concrete. Note: for machine screws, the hole size required is larger than the anchor size being used.5. The anchor is properly set when the lip of the setting tool meets the lip of the anchor. Each machine screw anchor has a specific setting tool that is determined by the diameter of the machine screw anchor being used. As the screw turns down into the base, it expands the base to secure the anchor in the hole, thereby fastening the fixture to the concrete surface.

Lag Shield Anchor: This is a female anchor consisting of a ribbed, slightly tapered sleeve of unthreaded zinc alloy that fits into a hole pre-drilled into concrete or the mortar joints of block or brick walls. Strike anchors enable long runs of fixture to be quickly installed but, once installed, are generally not removable.6. The diameter of the hole to be drilled for the strike anchor is the same diameter as that of the anchor to be used.

Split Drive Anchors: The resilient composition of the one-piece split drive anchor is the source of its holding power. The shield will merely spin in a hole that is too large, and if the hole is too small, the shield will be crushed by the taps of your hammer.7. When drilling the hole for a lag shield anchor, keep in mind that proper hole size is imperative. Because of the pliability of their soft metal wedge, lag shield anchor bolts work well in situations where the hold may be subject to vibration. In most cases, the long anchor shield provides better hold strength in base materials that are softer and less dense, while the shorter lag shield works best in harder or denser base materials such as masonry, where it can help to reduce drilling time.A couple extra tips regarding lag shield anchors:

Split drive anchors are intended for light-duty anchoring to concrete, brick, or block.See the chart below to assist you in selecting the best concrete anchor for your project.V = Very suitable M = May be suitable Type of MaterialOther Considerations in the Selection of the Right Concrete AnchorAnchors composed of stainless steel are the most rust resistant, and should be used if the anchor will be submerged in water, or subject to occasional wet conditions outdoors. The hole size should be equal to the diameter of the base of the anchor. While the split base is compressed as the anchor is hammered into the pre-drilled hole, it maintains outward pressure on the walls of the hole, giving the split drive anchor its holding power.More tips for installing split drive anchors:

Before installing any concrete anchors, it is important to know the differences among concrete anchors and their applications so you can select the best one for the job. Medium weight items should be sufficiently served by в…њ', 1/2', or в…ќ' diameter fasteners, while в…ќ', Вѕ', or 1' diameter fasteners work best for heavy objects.Concrete anchors and fasteners can be used in various concrete applications and projects. Anything fastened to concrete bears weight, referred to as вЂњload.вЂќ The chart below is intended for general reference regarding load values, and should be used in conjunction with specific load data from the fastener manufacturer.Ultimate Load Values in 2,000 psi Concrete SizeGenerally, smaller objects that weigh less can be fastened using 3/16' and 1/4' diameter fasteners. The anchor must be able to withstand the load factors of shear and tension. For dry, indoor use, standard zinc-plated anchors will suffice.Load consists of pressures on the concrete relative to the item being fastened to it.

Concrete Anchor Bolts Types