I leave about 5mm on the top and bottom too for added rigidity.Then you simply screw this box on top of the existing back box and lo, your new screw fixing points are 50mm further forward (or more or less depending on the box you chose. So, a 8g screw will be roughly 4mm in diameter.The following table lists the screw gauge sizes next to their equivalents in inches and millimetres:As mentioned above, oftentimes choosing the right screw will be a bit more complicated than simply grabbing the first box you see. Sorry, your blog cannot share posts by email. This is why PoziDrive heads are most commonly used in modern construction in Europe, as they are similar to the phillips but allow for less slippage to occur.It’s important to consider how hard the drilling surface is in order to know how much torque you will be using in order to set the screw. For example: M5-.4 x 15 has a length of 15 millimeters. The size of an imperial measured screw head will correlate to the size of the head in metric.

Longer plugs are available but these are ‘frame fixings’ and not designed to be used outdoors. )One thought – by the time a heavyweight job needs a No 10 and certainly a No12 screw into masonry, then I’ve almost certainly gone over to a coach screw, or you just can’t get the leverage required to put them in. Thanks for all the size info, but what type of screw is needed?

(paperback or eBook via amazon).Click the book to grab your 424 pages of pure handiness... Go on, be handy! For example, an 8g screw will have an 8mm head in diameter. Makes life so much easier for a DIYer.Best presented practical data on screws that I have seen. As long as it’s only the odd one, it should still hold well. 6mm – I’d go for a 10mm plug (near enough as above for a No14);I’ve just used 8mm coach screws in preference to a 10mm self-tapping brick screw for a gate-post on a wall. Just go real slow to start with and clear out the dust afterwards and you’ll be fine. Both have already failed.

The bracket I’ve brought is supplied with and has fixing holes that comfortably fit M6 size screws/bolts. This is the number starting with an “M”. Finding the right type of screw head for your project when there are hundreds of combinations of the drive type and head shape can be confusing, especially for beginning DIYers.It’s important to understand the differences between the shapes and drive types, not only so that you can find the right tools for your screws, but also so that you can ensure that y… Oh, and why it beats imperial? It was for a towel rail and the fittings supplied just seem to be too small. Metric wood screw sizes and why they beat imperial… The old imperial method of measuring screws by gauge makes little sense to some of us today, (like most imperial measurements) and the logic of their origins is known only to Wikipedia (he says smiling!).

Let’s take the time to really unpack what screws can be, and what they can be used for. No nonsense, concise information and table for all you need to know when using screws, drills and plugs.Click the book to improve your handiness today... Go on, make yourself useful!

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Record their details, requirements, action points and notes. Then the screw shank will obviously be much smaller. Here is a summary of the most common, and what they mean:Grab your copy now for all the DIY help you need right at your finger tips!Keep up to date with our DIY projects, tips and latest dealsDon't fancy doing this project yourself?

I agree that metal expanding bolts could be too much for the brickwork in this case.I think with it being ‘only’ 500mm high, I’d be tempted to get long outdoor screws, preferably with a hex head and then use regular wall plugs as deep as I could get into the masonry.

For example:Screws made for general use are almost always made of steel. A basic wood screw?The table pretty much covers all types of screws (since it mostly covers thickness and length) so what screw you choose depends what you’re fixing. Metric Screw Sizes Explained As you can imagine, the metric system is a little simpler to understand for the uninitiated however if you’re not used to it, or still working in Imperial it can be a little tricky. Explanation on Metric Screw Sizes. Old crumbly masonry (for example) or hitting a largely empty (of mortar) cross joint in blockwork (for example), will cause more problems with failure than screw size itself.Let me know more details (mirror size/weight/ hook shank size etc.)

However, the actual design and thickness of the head is also relevant to the amount of torque required to drill the screw into the setting. This is interesting to note since you can then figure that the gauge (in mm) is exactly half the size of the head. SAE vs Metric Bolt Sizes. Many Thanks!Usually I would use a heavy gauge regular (12g/14g x 75mm etc) screws with a large ‘penny washer’. If the pitch is the normally used "coarse" pitch listed in ISO 261 or ISO 262, it can be omitted (e.g., M8).