That was a quick reply. Sizes for nuts and bolts, thread pitch and more! Thanks for all the size info, but what type of screw is needed? You’re right, I don’t think any such gauge exists here. Learn how your comment data is processed. This is by far the most useful information I have found on this topic. - - - - Call 24/7 on: 03330 112 112 Call 24/7: 03330 112 112 Shop by Product Code Need Help. Small screws might be 6 and very small 4’s. Put it this way, I only have space for one permanent screwdriver in my pocket and that’s always going to be a PZ2. Thank you! Can you advise whether i just use one drill bit, and which size? Screws should be tight, but not crazy, “sweating to get them in” tight! The Fastener Dimension Guide is a web application that allows you to find bolt dimensions directly from your mobile device. I am lost on what size plugs to buy. I can’t equate this to your table above. The adhesive allowed him to really pull up the bolts and not squash the drywall. Is it as simple as a 10.5mm bit? Especially when drilling clearance holes for screws, bolts etc. Thanks for getting in touch. Ian, Hi Metric. Most folks in the trade use 8’s and 10’s for most stuff. Ian Thank you! Simply hit reverse and take it out. Hiya, Hex bolts from ITA Fasteners are mostly used in repair and construction work. Thanks for the comment. Big screws above 3″ can be 12’s or even 14’s. UK Screw Sizes – Imperial vs. Been in Sweden all weekend and just got home. For sure the fitting supplied go straight into the bin in most cases on my jobs! Don’t worry too much about hitting mortar, obviously if it’s three out of four holes maybe! Consider this size… M8-1.0 x 20. INC VAT … Well, I think I’ve suitably confused matters Can’t seem to find one on-line, only US. Hi Ian, very useful article thank you. Let me know what you’re fixing up and clarify the shank diameter of the screw and I’ll be much more specific, I promise! All dimensions are given in millimeters. These are the two most common sized plugs used in the UK. The base of each handrail post is a 100mm diameter steel plate with 4 x 5mm holes in each, the hand rail post is 50 cm tall so will exert an amount of leverage if leaned on. i.e. We have hung really large mirrors (like six feet tall heavy/ gilded things) on pairs of thick shanked screws in brown plugs with no problems. Any advice or input will be highly appreciated. Click the book to learn how to properly look after your home... 8mm anchor bolts could split the bricks? Welcome to Imperial Nuts and Bolts. Click the book to improve your handiness today... Go on, make yourself useful! If you’re going into drywall etc. Also agree with the self tapping stuff. Are they all the same type of screw Helen? The higher the ISO numbers are, the stronger the bolt. Hi Chris, Hey Ken, Ian. Similarly, when using coach screws with masonry, dip the screw in oil before use. 2) I need to hang a heavy mirror on a lath and plaster wall. Course, then you’ve got to sort the drill bits to put them back in the box . Record their details, requirements, action points and notes. Cheers Many Thanks! I am useing 10mm bolt for external brick. Hmm, a coach screw is really designed to go into wood. Contact: TYPICAL COACH BOLT The coach bolt has a square collar under the domed head and this locks into the wood when the nut is tightened. 995979268 and registered for VAT. I hate spam too, so of course your email address will never ever be abused or shared, you have my word as an artisan and a gentleman! Ian, I think the chap talking about STAR screws needs to have the difference between Phillips head and Posidrive heads, how to recognise them and which screwdriver to use. Then using a mini grinder fitted with a 1mm cutting disk, carefully cut out the majority of the back of the box, making sure you leave the part with the holes you just drilled. Can I first ask what you are fastening to the wall? Nice one Robin, I’ll add it to the article when I get a mo. Little concerned about the gap Geoff. Let me know if you get stuck and sorry again for the tardy reply. Well, I had an apprentice once who was a bit of an ‘eejit’ and used to drop screw boxes on a regular basis! If the plug is flush with the surface of the plaster, it’s going to pull out. Usually most bolts are too big for the ‘standard’ or common brown 7mm plugs. I assume the notional screw size is the same as the smallest hole it will fit in? Supplements: Metric hex nut dimensions calculator It’s difficult to be exact as it really does depend on the plug and the cleanness of the hole drilled etc. The wall plug will need to be the same size in diameter and depth as the hole you have drilled. A wood screw is sized by two different numbers. Definitions of terms are located below the chart. Let me know if you need any specific help! Our website uses cookies and similar technologies to provide you with a better service while searching or placing an order, for analytical purposes and to personalise our advertising to you. Best regards They are primarily used for holding together heavy timber, fixing metal to timber and in some cases masonry or concrete. The length of any non-countersunk bolt/screw is always measured from beneath the head and countersunk bolts/screws are measured from the top of the head Thread lengths vary over the size ranges but are generally 3/4" to 1". Many Thanks! Then the holding point is down at the bottom of the hole. Shank is 30mm and screw thread is 50mm. Ian. then I’d use multiple hanging points, they hang better and move less too. Cheers Stainless Steel – offers good corrosion resistance making them ideal for outdoor use. Hardwoods may well need a slightly larger pilot hole. You might get them in a 7mm plug but 8mm would be better (if you can find them). Getting too old for new tricks maybe? However, I have a cunning plan……. There are variety of bolt types used for different applications depending on what you are trying to achieve. I will hang a large mirror on a concrete wall. I understand there’s a ‘range’ but why not give us the ‘ideal’ measurement, because mostly we have a choice? Or you can use a hook of some kind… or similar. Cheers Also, there is only a few main ones. I have access to lots of ‘hospital drip’ tubing (wifes a nurse you see) which is about 3 or 4mm tube, perfect when cut down one side with some tiny scissors (also ‘single use’ from the hospital lol!). So, go on, make yourself useful! Definitely not a brown plug as they are 7mm and blue plugs are usually 10mm so neither are any use in an 8mm hole. I included the hole size on last column, in brackets… .tg th{font-family:Arial, sans-serif;font-size:14px;font-weight:normal;padding:4px 20px;border-style:solid;border-width:1px;overflow:hidden;word-break:normal;border-color:black;background-color:#FFFFFF !important;} Cuts through all the ‘blah’ on other sites. Hi Alex, Resin is obviously a great way forward as it holds well without creating stress, but it’s much more work and the nuts don’t look as neat as a screw or bolt head. My question is what is the best fixing option? Difficult without knowing the weight of the mirror, but I’d have through that an 80mm slotted, square hook would be fine with a regular brown 7mm plug, making sure that you push the plug into the masonry itself and through the plasterworks. I have got a piano hinge to attach to mdf 5mm thick. A heavy mirror really needs to go into the studs of the wall. 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