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.tg .tg-cd35{background-color:#010066;color:#ffffff;border-color:#010066;text-align:center;vertical-align:top}. Ian. If the hole you have is 4.8mm (and that is in effect your pilot hole) then you’re going to need a screw the next size up. It is my pet hate when a manufacturer says 6mm to 9mm (random example) in their installation specs, OK, I get that there is a range, but since I am stood here with a tape and can make it what ever I want, I want the optimum size! Simply hit reverse and take it out. Thanks for all the size info, but what type of screw is needed? So sorry Jan, Wow! True Erik. Don’t worry about the length of the brown plugs, just tap them deep into the hole until there is only 40mm (or equal to the length of the plug) of the screw/ bolt sticking out. However, I have a cunning plan……. What is the job and your thinking behind drilling a 5mm hole (instead of a 6mm)? I have a slotted square 80mm hook which I want to use for hanging a large mirror on a masonry wall. Please help me. This will also make it easier to remove the screw at any point. These screws come in a wide range of sizes, from the very small ones packed with furniture designed to be assembled by the consumer to extremely big ones … if you need more specific help. As mentioned, a set screw is fully threaed along the length of the body, therefore the length is stated by the measurement from under the head to the end. You’re going to struggle to get a red rawlpug into a 5mm hole, although we used to get them into 5,5mm holes when using small gauge screws. To confirm we are talking thread only yes? Hex bolts from ITA Fasteners are mostly used in repair and construction work. All round handy bloke, a one time humanitarian, and mad scribbler. then you’ll need some special drywall fixings which spread out behind the drywall (let me know). The staff at ScrewFix cannot give me any suggestions, they only sell products (-; Since the mirror is not really that heavy, will you give me any suggestions on what size and type of screws should I use? For standard bolts in the range of M5 – M12, we offer our own Pro-Gauge £5.83 Put it this way, I only have space for one permanent screwdriver in my pocket and that’s always going to be a PZ2. Sometimes on ‘dot-and-dab’ walls, this can mean cutting out a square and re-bedding a new piece with a full backing of adhesive. Just how big is that mirror lol! Simply take out the drill bit you estimate is big enough and then slide the screw/bolt into its hole and there you are, instant gauge (but don’t try this for pilot holes, they’ll end up too big!). 8mm holes, 8mm plugs. I have been successful with them in dense blockwork when T’ing off with a timber stud wall etc. This is an excellent and useful article on screw fixings. (I tried one and it pulled the brick facing off). Ian, Daft question I guess, I have screws/bolts size 2 and a half inch in length heads about 8mm and bout width is 6 mm it’s to re hang tv bracket can you give me any advise.. Ian, Just what I was looking for. Ian Is that the size of the head of the bolt (spanner size) or the diameter of the bolt itself? Cheers Terms and conditions apply. The diameter specifies the shank and thread dimension. To be sure, put one over a tape measure and take a pic and send it to me and I’ll know for sure. What you'll receive: - The size of a metric screw or bolt is specified as diameter, pitch and length, in millimeters (millimeters is abbreviated "mm"). Similarly, when using coach screws with masonry, dip the screw in oil before use. Hi Ian, However the size or gauge of screw the plug takes is flexible, according to the manufacturers. Credit subject to status, UK residents only, Toolstation Ltd, acts as a broker and offers finance from a restricted range of finance providers, PayPal Credit is a trading name of PayPal (Europe) S.à.r.l … A number 4 screw is much smaller than a number 12 screw. If the plug is flush with the surface of the plaster, it’s going to pull out. Ian. Where I live in Indochina we can only get hardwood chopsticks. Consider this size… M8-1.0 x 20. click… Metric wood screws explained Image credit: UC Davis Engineering Pitch is the measurement between the apex of adjacent threads on the bolt's shank. #8 or #10). I think it is disgusting the handle manufacturer was unwilling to help, that sort of thing appalls me. Ian. Cheers I’ve explained this screw data in an easy to understand table because I find manufacturers recommendations are often vague and general, I mean; why not be specific? If you put the phillips in a pozi or vice versa you will feel that it does not SEAT firmly/cleanly whereas the correct driver fits the correct screw snugly. Cheers Hi Alex, Usually I would use a heavy gauge regular (12g/14g x 75mm etc) screws with a large ‘penny washer’. As long as it’s only the odd one, it should still hold well. This handy chart below hi-lights a few differences between the two. Because this is approximately the same as the Major or Thread diameter the thread diameter measurement can be used for fully threaded bolts. p.s. Ian, Hi Ian, I need to hang a fairly large tv. If it’s a massive mirror (I’ve hung some more than 3m tall etc.) ), then a red 6mm plug is fine. Hope that helps you sort out your screw dilemmas. You can find them with a big magnet or a wall/metal detector etc. Hi Ian, very useful article thank you. Cheers For sure the fitting supplied go straight into the bin in most cases on my jobs! Popularly used in all assemblies, a standard hex bolt is a staple across the world. Ian. Oh, and some free stuff mixed in with regular posts :-). .tg td{font-family:Arial, sans-serif;font-size:14px;padding:4px 20px;border-style:solid;border-width:1px;overflow:hidden;word-break:normal;border-color:black;} Very useful, thanks. The fastener would twist into a #12 hole on the plastic measuring card at HomeDepot, so that’s what I bought. Hardwoods may well need a slightly larger pilot hole. Manufactured to ISO 4014 or DIN 931, and therefore includes an unthreaded section of the shaft. (paperback or eBook via amazon). “It is a Canadian invention called the Robertson Head. It really is a case by case/ trial and error (or experience of course!) Instead I use chopsticks! Best of luck with your projects! Any really bad holes you could resin fill maybe and push the screw into it (seen this done with outdoor ‘no-nails’ type stuff in a pinch, he left the screw a couple of turns proud and nipped it up after 24hrs… big dodgy but what can you do sometimes!). Wanting to try drilling into masonry (indoors) & bit wary but willing to give it a try. By coincidence, the size of an imperial screw head also roughly equates to the gauge. In fact, if any screw starts to get very tight, it’s best to stop and have a rethink before you break the screw or burst the material. For example an 8-gauge screw has an 8mm wide head…..handy huh? I am looking for an appropriate wall plug and the closest I have found is a 70mm at Screwfix. Ian Let me help you improve your 'handy' skills with a free, easy to follow, mini DIY course. But there are lots of other ways…, Let me know the gap and we can talk again (it sounds like there are some timber battens or framing over the bricks to take the plasterboard?). Contact: ian@handycrowd.com The pilot hole recommendations in the chart are typical for softwoods. Insist on the best it will be branded Spur UK. 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. For both phillips and pozi the MAJORITY of average sized screws would use either a PH2 or a PZ2 driver head. Makes life so much easier for a DIYer. A4(316) - can handle high and low temperatures but has a higher corrosion resistance making them ideal for coastal areas or areas with high pollution. Terms and conditions apply. Ian, Hi Ian I am a little bit exaggerated when I bought the big coach screws for my mirror, I am just scared that the mirror will fall off from the wall if I use small screws, lol. Can you advise whether i just use one drill bit, and which size? I am useing 10mm bolt for external brick. Thanks for calling in, Also, there is only a few main ones. Small screws might be 6 and very small 4’s. 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. The plug may measure a little more but it will compress slightly when it’s pushed/hammered into the wall. I explained how using a substantial fixing on flimsy twin slot uprights will not work as the countersink is not deep enough but on genuine Spur which we make in Devon England will take the larger screw size and still allow the bracket to fit. Do you think a hole drilled with a 5mm bit would be too tight for a 4x40mm screw in a red rawlplug? Something scary for Halloween I hope , I’m home alone this year….gulp! It’s difficult to be exact as it really does depend on the plug and the cleanness of the hole drilled etc. Hi. The metric screw equivalent size is approximate, but since we’re heading that way, we need to learn and get used to them! If you’re going into drywall etc. So, go on, make yourself useful! When tightening or loosening a coach screw it is important to use the correct size spanner, wrench or impacts socket to avoid damaging the head of the screw. If you’re not sure what all these holes do; here’s a brief explanation…. Hmm, a coach screw is really designed to go into wood. Are they all the same type of screw Helen? I guess I could (resin) glue in steel threaded rod and fix down with nuts? Thank you! It is distinguished from other bolts by its shallow mushroom head and the fact that the cross-section of the shank, though circular for most of its length (as in other kinds of bolt), is square immediately beneath the head. I don’t have any boxes to match up against and, if I buy any it rather defeats the object! It shouldn’t be too tight a fit at the neck of the plug, as it will get tight once you get further in. Am I right that if I drill a 6mm hole into a brick wall, use a red plug and then an 8g screw 2 and a half inches long I have got the right idea? Is there a discussion on the types of ‘star’ screwdriver and matching them with the correct screw. They can be used in the same manner only before you make with the screw and screwdriver, I crack the wood by banging a flat-blade screwdriver in to the wood to crack it so the screw has a pilot hole. or +47 91754808, Made with the ever marvellous WordPress running the X theme, tweaked by Ian. Hi Lal, Ian, Dear Ian, your site is brilliant! To get them sorted out we grabbed a piece of cardboard and taped each screw size to it, to help him visually judge what size screw he had picked up. Then what you do is drill two holes in the back of the box corresponding to the holes on the front. Thanks Bob. However some stores will stock 8mm plugs. You could go even bigger and go for 7mm brown plugs and a 10g screw of the same length. Sorry for the delay, been working way up in the mountains and not been checking in very often. They could only tell me that the head diameter is 4mm and the length is 20mm. Or alternatively you could drill the hole one size up and use the blue plugs. Otherwise it’s best to head into the store and find the biggest plug that will take the screw shank diameter (the threaded part but minus the actual threads). Any assistance will be appreciated. Hiya, Screws should be tight, but not crazy, “sweating to get them in” tight! For years I used to use a 5.5mm SDS bit for my red 6mm plugs because like you noted, a 6mm SDS bangin’ around in a brick and especially a block leaves a hole slightly oversized. You’re most welcome Janice, glad it helped . The absolute key factor is getting deep enough into the brick for the plug to do its job. Get in touch and I’ll help if I can. Metric screw sizes provide a diameter and length in mm. 10g or 5mm etc. Thanks for your input, always good to hear others experiences as it adds to my own! Another point is that heavy loads are as much about the substrate as the actual fixing. Not really that heavy and big for the coach screws I bought,lol. I have 10mm lag screws that I need to fit into a 15mm render and 100mm concrete block wall. Sorry there is no silver bullet Helen! Happy New Year to you , Hi Ian, a 4mm head is approximately a 4g screw though…. Hi Bernard, Exact size also works in most cases. Imperial screw sizes provide a gauge size and a length in inches. Just a thought … I’ve got a set of drill bits in a nice plastic box. Sizes for nuts and bolts, thread pitch and more! Ven, Hi Ven, sorry to be a bit slower this time! The bolt chart provides both US and metric stud sizes. See what they have at the store screw/length wise, stainless steel is best of course. It’s just that plastic wall plugs of the size you’d need for a screw that size are not in common use. Do I increase the size of the wall plug? Hi Brian, Drill holes very slowly and carefully (SDS etc)and blow out the dust (seems worse on vertical holes as the bit doesn’t clear as well as horizontal holes). 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. Ian. 995979268 and registered for VAT. But generally, standard wood screws are used for most things and coated screws for anything outside. For nuts, size will appear as diameter and pitch. Any suggestion welcome! I’m 99.9% sure it will be a 10mm hole. p.p.s. .tg .tg-yz3o{color:#010066 !important;border-color:#010066;text-align:center;vertical-align:top} Thanks for the nice comment! To ensure that any heavy object that will be fixed to the wall is secure, it is essential to use a wall plug with the coach screw. They are primarily used for holding together heavy timber, fixing metal to timber and in some cases masonry or concrete. A Phillips screw merely has a cross on the head and a phillips driver is essentially the same – just ensure that your phllips is the correct number. Someone suggested that I cut the head of a M4 40mm and then use an electrical ferrule and connect the headless M4 40mm to a M4 100mm by crimping the two screws together inside a ferrule. Fischer used to make an 8mm plug I believe (all their plugs are grey.) Hiya, Just how big is that mirror lol! And also what rawl plugs size and drill bit size should I also use? if you’re worried out the sharp edges of the cut out area, it’s easy to shield them by making a ‘grommet’ out of some thin plastic tubing cut on one side. Any plaster? To be fair, the manufacturers don’t know what you’re fixing into and they seem to assume solid concrete! I wrote this post yesterday actually! An ISO Class 10.9 bolt roughly corresponds to an SAE Grade 8 bolt. We used to do the same in the UK with metal ‘knob and tube’ up until the 1950’s or thereabouts. I can purchase the 150mm M6 bolts, but what size drill bit would you use/and what rawl plugs would you use? Ian. Let me know. Would grinding a little off the top of the screw work do you think? by 10mm lag screw, do you mean a screw with a 10mm head? Kind regards Paul, Hi Paul, Hi John, Use the dimensions of your bolt to determine the appropriate size nut. I agree that metal expanding bolts could be too much for the brickwork in this case. Imperial Screw Sizes Explained. (maybe take a picture of the box and let me have it….) I would start with a 12g or 5.5mm to be honest. Click the book to learn all about your lath and plaster... 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! The Fastener Dimension Guide is a web application that allows you to find bolt dimensions directly from your mobile device. I’m mounting a TV to my wall and the bracket has come with 10.5mm plugs and the corresponding screws but no note of what size masonry bit I’ll need to make a hole to accommodate. Ian, You’re most welcome Mr Morad, hope your project went well? Just that sometimes it’s best to sink the plugs into the wall a little (if the screws are long enough). Imperial Nuts and Bolts specialise in the manufacture and distribution of imperial hardware. One email per week for a few weeks, where I'll show you how to build money saving, practical DIY skills, create a unique home and properly look after your stuff. Good luck with your jobs! Use one of these links to view the products on the RS website. 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