![]() ![]() The tighter the anchor fits with the screw, the more weight it will be able to support. With concrete, you will need to use either wood, plastic, or metal anchors for the screws. Using wall anchors makes a big difference to the amount of weight you can put on a screw. You can try larger screw heads, which is fine if you are attaching the drywall to the frame of a building. For wood, it’s better to go with a thinner screw to prevent it from sticking in or splitting the wood.ĭrywall is brittle, and most screws will pull straight through the material before you can put any real torque on them. But the thicker the screw, the more they cost and the more effort they take to screw in. Thicker screws can cope with shearing and pulling forces better. Softer screws are sometimes better for wood as they will bend as the wood expands and contracts during the winter. ![]() Tempered screws are harder and more suitable for higher amounts of pulling force on the head. Often, the weight limit is not on the screw but on the material the screw is trying to hold in place. Cheap steel screws will have around a third of the tensile resistance of an alloy screw. The vertical strength of a screw will depend on its shaft width, the type of metal, and the manufacturer. You can use self-tapping screws, which also have coarse threads. Their more distant thread gaps help to compress the material, forming a plug. Some masonry screws use fine thread bolts with metal anchors.Ĭoarse threads are more common for wood screws, drywall, and other softer materials. The fine thread takes longer to tighten but offers far more surface area for applying torque. Each has distinct advantages and disadvantages.įine threads work well on metals, where you either thread the metal or screw it into a nut. There are two main types of screws: coarse and fine thread. Type of Screw Threadĭepending on the material, you want to choose the thread that best suits the materials that you are securing. Materials are unpredictable, and it is better to use more short screws than to rely on a single long screw. You also do not want the sharp end of a screw to poke through for someone to cut themselves on. But the extra length will make a dramatic difference in anchoring the screw.Ī 2-inch screw means that you have more screw shaft to make it through the surface and into the backing support. ![]() The tensile strength of a 2-inch (50mm) screw is the same as a 1-inch screw of the same diameter and material. ![]()
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