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The amount of weight a wall plug can hold depends on its size and the material it is made from, also the fixture you are using. As mentioned earlier, yellow wall plugs can hold up to 5kg, red wall plugs up to 15kg, brown wall plugs up to 25kg, blue wall plugs up to 35kg, and grey wall plugs up to 45kg.
The screw length is the third and final number you find in metric callouts. It’s measured differently depending on the type of the screw head. The purpose of a pilot hole is to clear the diameter of the shank or body of the screw so that only the threads engage with the wood fibers. Failure to do this will result in wood splitting, especially in hardwoods or MDF-type products. For this, you are going to need 2 drills. Most people have at least 2 drills or more in their workshop. If you don’t, I do suggest grabbing another one as it will make your life a lot easier. These are the ones I use and recommend.As you drive in the screw, it should bite into the wood and tighten down into the hole and bury the screw head. If your screw gets down to the head and then starts spinning in one spot, it has stripped from its hold in the timber. This means your pilot hole was too big. Don’t get it confused with the US gauge. Just because they’re both written as the first numbers in callouts, doesn’t mean that they’re the same thing. Red wall plugs require a 6mm drill bit for installation and are suitable for use with screws with a diameter of 3.5mm to 5.00mm. They can support weights of up to 15kg, making them suitable for medium-weight items such as small cabinets or bookshelves. When installing a red wall plug, make sure the plug is the same length as or longer than the screw you’ll be using. It is also important to avoid overloading the wall plug with too much weight, as this can cause it to fail and the item to fall. Brown Wall Plug Metric callouts look different from imperial ones. Thus, metric screw size charts will have different info than what is provided in imperial charts. The second chart below is a US fraction to metric mm for the more common sizes up to 4". US Screw size conversion chart:
On the other hand, non-countersinking threads are designed so that their heads remain above the surface. The shank is the part of the screw that lies beneath the screw’s head. It can be threaded all the way to the tip, partially-threaded, or not threaded at all. 3. What Is the Difference Between Metric Machine Screw Sizes and Wood Screw Sizes? In this article, you’ll find all the information you need to read metric screw sizes easily. We also included an easy-to-follow metric screw size chart. While it is possible to screw timber without a pilot hole, I would always recommend you do drill a pilot hole. Your project will be much neater and less likely parts of the timber will split. Does This Mean I Need 2 Holes For Every Screw? Yes, you can screw timber together without a pilot hole although there are some details to consider. When we screw into timber without a pilot hole, the screw will always take the path of least resistance.You may have noticed in the table above, I have listed sizes for a pilot hole and a clearance hole, but what is the difference? If you’re used to using the imperial screw sizes, reading screw sizes in mm might be confusing to you. Once you figure out the meaning of each number found in screw callouts, you’ll find that reading callouts and screw size charts is a piece of cake. Most softer woods may not need a countersink but hardwoods nearly always need one. Some wood screws come with small raised parts under the screw head. These are what chew the wood and allow the screw head to bury itself flush with the timber surface.
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