The difference between black and white drywall nails

<p>What are the differences between black and white drywall screw, do you know? Generally, the market is mostly black, that is, black phosphating. There are also blue and white, that is blue zinc. There may not be many blue zinc in China. More than 80% of the demand for <a href="https://www.gdfshuajian.com/drywall-screw" rel="noopener noreferrer" target="_blank">drywall screw</a> is concentrated on the 3.5x25 specification. Because the main Used for gypsum board, and the thickness of gypsum board is the same.</p><p><br></p><p>Selection criteria for drywall screw:</p><p>1. The head should be round (this is also the common standard for all round head screws). Because of the production process, the heads of the drywall nails produced by many manufacturers may not be very round, and some are even slightly square. The problem is After screwing in, it can't completely match the gypsum board.Is it concentric, rotating around a center point, this should be well understood.</p><p><br></p><p>&nbsp;2. The tip should be pointed, especially when you are using it on light steel keel. The sharp angle of drywall nails is generally required to be between 22 and 26 degrees, and the sharp corners of the head are required to be full, and there should be no dragging or cracking. This "point" is the most important for drywall nails, because the use of drywall nails does not make pre-made holes, but is directly screwed in, so the pointed tip also assumes the function of drilling through. Especially when used in light steel keels When it is installed, a bad tip will cause it to fail to drill, which directly affects the use. According to the national standard, the wallboard nail must be able to penetrate a 6mm iron plate within 1 second.</p><p><br></p><p>&nbsp;3. Cannot be eccentric. The easiest way to judge whether the drywall nail is eccentric is to put the round head down on the table to see if the threaded part is vertical and should be in the middle of the head. If the screw is eccentric, the problem is that the power tool is screwed It will shake when entering, and the short screw is okay. If the longer screw encounters this situation, it will be more troublesome.</p><p><br></p><p>&nbsp;4. The cross groove should be in the center of the round head, otherwise it is the same as the situation in 3.</p><p><br></p>