Reference should be made to applicable codes for the specific working ratio. A safety factor of 4:1 or 25% is generally accepted as a safe working load. If you do all this, you will be able to pick the right masonry drill bit every time you visit a drill bit store. And, still, if you fail to determine the accurate size of the drill bit for your drywall anchor, here is. Consider the type of job you want to do ensure the bit you choose is compatible with your drill refer to your pilot chart to know the bit size and length needed ensure you go for masonry drill bits and avoid the cheap ones. For both the molly and plastic drywall anchor, the suggested drill bit size will be 1/2. Values shown are average ultimate values and are offered only as a guide and are not guaranteed. Choose the size according to the anchors’ type, for instance: If your anchor type is a toggle bolt, choose the drill bit size at 5/16 drill bit. Technical Information: Ultimate Load Values in 2000 PSI Concrete Size (high quality drill bits review, low price drill bits review) In nearly all other countries, metric drill bit sizes are most common (like Bovidix 1902103423). In the U.S., fractional inch and gauge drill bit sizes are in common use. When vibration or sudden impact is part of the load conditions, the spacing between anchors should be increased. Drill bits can be made in any size, but standards define sets of sizes that are widely produced and stocked. Welcome to Concrete Fastening Systems Concrete Fastening Systems 1231 E. Visit Concrete Fasteners for more information. Table 11.4 Rotary drill rig selection chart for large - diameter holes Rotary drill rig size ( hp ). As a rule of thumb, the expansion anchor industry has established a minimum standard of ten (10) anchor diameters for spacing between anchors and five (5) anchor diameters from an unsupported edge. To ensure proper wedge anchor installation, consider anchor diameter, anchor length, and thread lengths. If the anchors are installed too close together, it can cause an interaction of the forces, thus reducing the holding power of the anchor. The forces on a Wedge Anchor are transferred to the base material in which it is installed. This will provide some extra depth to accommodate a minor amount of concrete cuttings which may not be able to be cleaned out of the hole. The depth of the hole in the base material should be at least the length of the anchor minus the thickness of the material being fastened. The Wedge anchor requires no maximum hole depth. The sum of these three items equals the minimum wedge anchor length. To determine the length of wedge anchor required, add the thickness of the material to be fastened, plus minimum embedment, plus the thickness of the nut and washer. Wedge anchors should be used only in solid concrete. Wedge anchors come in a variety of diameters, lengths, and thread length and are available in three materials: zinc plated carbon steel, hot-dipped galvanized, and stainless steel. ![]() ![]() To ensure safe and proper wedge anchor installation, certain technical specifications must be considered.
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