Especially when drilling clearance holes for screws, bolts etc. I am lost on what size plugs to buy. Cheers The Fastener Dimension Guide is a web application that allows you to find bolt dimensions directly from your mobile device. My only comment would be to get the fasteners as deep into the wall as you can practically go, preferably below the top course if you say they are laid flat. You will need to use a wood drill bit to drill the pilot hole. 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. Another topic I guess…….. Hey Mike, Hmm, a coach screw is really designed to go into wood. I will hang a large mirror on a concrete wall. Simply enter the bolt size and length and you will be presented with dimensions that conform to ISO standards. Tip all the drills out and bingo – a nice template for measuring screw sizes, at least in mm. I don’t have any boxes to match up against and, if I buy any it rather defeats the object! Good luck So, go on, make yourself useful! This handy chart below hi-lights a few differences between the two. I don’t think you will Bob. Get in touch and I’ll help if I can. 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. The holes for the drill bits are all labelled (metric: mm). To stop the coach screw from becoming stuck in wood, rub the threaded shaft with hand soap. What is the job and your thinking behind drilling a 5mm hole (instead of a 6mm)? 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. The bracket I’ve brought is supplied with and has fixing holes that comfortably fit M6 size screws/bolts. I need to mount a handrail on top of a low (18 inches high) brick wall which is topped with hard (but not architectural)bricks laid on edge, i.e. 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. Pilot hole; then measure the shank. Cheers Any assistance will be appreciated. Cheers and let me know how you get on. I wrote this post yesterday actually! Thanks for making the time to say thanks, appreciate that The diameter refers to the major diameter, or outside edge, of the threads. Any advice or input will be highly appreciated. They come in a wide range of different hex bolt sizes for custom applications … Use a thick gauge though and drill a pilot hole appx half the screws diameter of the big screw might get stuck half way in. We used to do the same in the UK with metal ‘knob and tube’ up until the 1950’s or thereabouts. If the wall is plasterboards let me know and I’ll go through that. Hi Ian, I have 10x50mm coach screws. 2) I need to hang a heavy mirror on a lath and plaster wall. Ian. Hey Mairin, Metric nut comparison. Depends on so many things! (paperback or eBook via amazon). Thank you! 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). Use the dimensions of your bolt to determine the appropriate size nut. Definitely not a brown plug as they are 7mm and blue plugs are usually 10mm so neither are any use in an 8mm hole. Note: Not all sizes are available in ALL materials, please refer to relevant material section. Ian, Tried to find some info about screws, read a bit and then your picture jumps up on my screen – glad you got top spot on google, and thanks for the info. then you’ll need some special drywall fixings which spread out behind the drywall (let me know). 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. .tg {border-collapse:collapse;border-spacing:0;} A Coach Screw is a heavy duty screw which has a square or hexagonal head and an externally threaded cylindrical shaft that tapers to a point at the tip. Let me have more details or a even a pic two two, and I’ll take a look for you Many thanks Geoff, Hi Geoff! The size of a metric screw or bolt is specified as diameter, pitch and length, in millimeters (millimeters is abbreviated "mm"). Sorry there is no silver bullet Helen! I’ve also done something similar using matchsticks or cocktail sticks, just fill up the hole with them and snap them off flush with the surface. Merry Christmas! Data listed for these sizes is independent of the ASME specification. If you have some boxes of screws you can use them to help you learn the thickness of each gauge of screw, then it’s a simple matter of sorting out the length with most folks can do pretty accurately with practice. Ian, You’re most welcome Mr Morad, hope your project went well? There are 2 fixtures for hanging at the back of the mirror. I am hanging a TV bracket. Good luck! This is by far the most useful information I have found on this topic. Cheers A Coach Screw is a heavy duty screw which has a square or hexagonal head and an externally threaded cylindrical shaft that tapers to a point at the tip. I’m looking for a bit of help. They are long, have flanged heads and designed for outdoor use, just a thought (Have a look at what I mean at screwfix…). Put it this way, I only have space for one permanent screwdriver in my pocket and that’s always going to be a PZ2. I agree that metal expanding bolts could be too much for the brickwork in this case. Bolts of ISO class 8.8 and the slightly stronger class 9.8 roughly correspond to an SAE Grade 5 bolt. This means that should you ask for a 1/2-inch x 12 x 4-inch Grade 2 Hex Bolt Head with a 1-inch thread, the request is universally understood by bolt manufacturers. The metric screw equivalent size is approximate, but since we’re heading that way, we need to learn and get used to them! It’s just that plastic wall plugs of the size you’d need for a screw that size are not in common use. Cheers The M8 will measure about 8 mm in diameter, more likely, just a touch undersize, (.31496") The M10, about 10 mm in diameter, (.3937") and the M12 about 12 mm in diameter, (.4724"). If you are unsure of the diameter of the coach screw, hold a drill bit against the shaft. 8mm anchor bolts could split the bricks? Ian, Fantastic bit of info, very concise and easy to reference. I guess I could (resin) glue in steel threaded rod and fix down with nuts? My only comment would be to get the fasteners as deep into the wall as you can practically go, preferably below the top course. Understanding Screw Sizes – Inch Standards Screws with a diameter smaller than 1/4" have a nominal size indicated by a number (e.g. (I tried one and it pulled the brick facing off). Thanks for getting in touch. Any plaster? Click the book to grab your 424 pages of pure handiness... Go on, be handy! I definitely agree with you re the larger screws, I’ve got nothing over a 10g x 100mm in my box for sure. Is it as simple as a 10.5mm bit? But if you crack the gauges by experience, the lengths are easier….. Best of luck with your projects! to find the nails holding the lath to the studs. Handy chart for converting metric screw sizes to imperial. Longer plugs are available but these are ‘frame fixings’ and not designed to be used outdoors. A heavy mirror really needs to go into the studs of the wall. I’m assuming it’s outside so whatever you choose obviously needs to be suitable for prolonged outdoor use. Ian, is there a ‘permanent’ code for the relationship between the drill bit mm size, rawl plug size and the actual screw size to use? Ian, Hi Ian, I need to hang a fairly large tv. A metric bolt designated as ISO class 6.8 roughly corresponds in strength to an SAE Grade 2 bolt. Post was not sent - check your email addresses! Timber: All coach screws require a pilot hole, using a general purpose drill bit such as a Twist Drill Bit, before they are screwed into place, preventing the wood from splitting. Been without internet in Croatia for ages and have been travelling back. You’re the man! It was for a towel rail and the fittings supplied just seem to be too small. At the moment I’m not sure exactly what length M4 will reach the wall box bracket, but it will probably end up being in the region of 120 to 140mm. Parting note about wall plugs: Be aware that not everyone follows the colour ‘rules’, one leading brands plugs are all grey for example, and others are, well; they can be any colour under the sun (as the above photo of my box shows). Good luck with your jobs! Cheers! 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. What would be the smallest you could create? You might get them in a 7mm plug but 8mm would be better (if you can find them). Then what you do is drill two holes in the back of the box corresponding to the holes on the front. Cheers Cuts through all the ‘blah’ on other sites. Longer plugs are available but these are ‘frame fixings’ and not designed to be used outdoors. 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. Thousands of customer product reviews. I’ve got a glass writing board to fix and they’ve provided white rawl plugs which say U8 on them. 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. Clearance hole; measure the outer diameter of the threads. Ian, Hi 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. A fat screw in a hard wood is different to a skinny screw in a soft wood for example. I saw a guy do one once by drilling a few 25mm (1″) holes through the plasterboard, packing in some fibreglass (at the bottom, to stop the adhesive falling down) and then pushing lots of drywall adhesive into the large holes until the area around the holes filled up with adhesive. In brick though, the plug size isn’t critical. Moved around a bit, from one side of the planet to the other, but now settled close to the beach in Norway. Terms and conditions apply. incidentally, I think you should send me a picture of the hanging points, then I can better advise you. So for example when using an 8mm coach screw the pilot hole needs to be 4mm for softwood and 6mm for hardwood. 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 nuts, size will appear as diameter and pitch. Once you have the studs located you can go ahead and use normal wood screws. Just how big is that mirror lol! 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. Cheers Brass or stainless steel is common for more decorative stuff on hinges or handles etc. For example an 8-gauge screw has an 8mm wide head…..handy huh? Ian. I assume the notional screw size is the same as the smallest hole it will fit in? Thanks for stopping by, Am i meant to measuring the threaded part of the screw or the non threaded (shank only) of the screw? Your message fell through the gaps in the internet. The mirror will be hanged in the dining here at home, with a measurements of 72” x 36” inches and according on the box the mirror weigh 35kg. Just that a ‘normal’ wood screw with an 8mm wide head is an 8 gauge screw. Don’t worry too much about hitting mortar, obviously if it’s three out of four holes maybe! To be sure, put one over a tape measure and take a pic and send it to me and I’ll know for sure. The fastener would twist into a #12 hole on the plastic measuring card at HomeDepot, so that’s what I bought. Then the holding point is down at the bottom of the hole. Maybe in the States but I’ve never seen anything that small in local stores/merchants in the UK/etc. I have a slotted square 80mm hook which I want to use for hanging a large mirror on a masonry wall. 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. Hey Ven, Pretty hefty plugs! Can I first ask what you are fastening to the wall? Metric Stud Bolt To Nut Size Chart. then I’d use multiple hanging points, they hang better and move less too. On the head of each bolt are two numbers separated by a decimal point, the full list includes ten grades from 3.6 to 14.9 but in plant and machinery … Take the bolts with you to the store and check the diameter of the bolt’s shaft to the inside diameter of the plug. If the screw starts to get too tight, then it’s advisable to back out and re-drill a larger pilot hole rather than risk breaking a screw (you’ll be having a very bad day if you snap a screw…..). All rights reserved obviously (duh!). Bolt measurements can be calculated in millimeters or inches, but bolt measurements specified in inches are international. 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 … Hi Bernard, p.p.s. Hope that helps you sort out your screw dilemmas. The diameter specifies the shank and thread dimension. And yes, no pilot holes, that’s just if you’re going into wood. 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!). 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. Insist on the best it will be branded Spur UK. click… Metric wood screws explained There are two main grades of Stainless Steel: Coach screws come in an array of different sizes and are manufactured to confirm with DIN 571 German national standard dimensions, .tg {border-collapse:collapse;border-spacing:0;} 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?). 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. I have a good quality stud detector and have established that there are no frame struts suitable to accommodate the requirement. Have you considered bonding the hinge in place? 2 Questions: 1) I have a bunch of plugs (all colors) and a bunch of screws. Big screws above 3″ can be 12’s or even 14’s. I’m 99.9% sure it will be a 10mm hole. I would like a plastic gauge so I can simply poke the screws through the holes to determine their size. Let me know if you have questions… Normally for heavy stuff like a TV bracket you would be looking at creating a solid substrate to screw back onto. I ask because The Home Depot guy was dropping the screw into a hole in which the threads would fit, and I thought maybe I was doing it wrong. (That’s also good advice to stop and re-drill if you think it’s too tight.). In a pinch you can use a plasterboard fixing which opens out behind the plaster. Plus, – how is a screw size, say, 8mm, what is that? The length of a bolt is also stated by the measurement from under the head to the end, but the length of the thread is determined by the diameter, as shown above. You mention the wall is concrete, just concrete? Stainless steel screws: Our range of stainless steel screws are some of the best available on the market. Do you think this “cowboy” type plan might work? If the plug is flush with the surface of the plaster, it’s going to pull out. 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. Can you help What size screw do I need? 10g or 5mm etc. Once the pilot hole has been drilled, the coach screw can be driven directly into the wood. Cheers You can make your own (no, not with a cornflake box and sticky tape) but rather you can ‘convert’ a regular back box, preferably a deeper one like this… from Screwfix or such like. The plug may measure a little more but it will compress slightly when it’s pushed/hammered into the wall. Ian, Hi, I know this is an old post, but I still hope that you can help. Cheers As long as it’s only the odd one, it should still hold well. Ian. True Erik. Wow! The wall plug will need to be the same size in diameter and depth as the hole you have drilled. It really is a case by case/ trial and error (or experience of course!) So sorry Jan, .tg .tg-7gvc{background-color:#ffffff;color:#010066 !important;border-color:#010066;text-align:center}. It might leave the drive a little small for the screwdriver though… Alternatively, can you increase the countersink a little (without going all the way through!)? Click the book to improve your handiness today... Go on, make yourself useful! Oh, and some free stuff mixed in with regular posts :-). Use one designed for double boards, i.e. Then you could use a longer screw (cut short) into VERY carefully drilled pilot holes to fill in the hinge holes and look ‘proper’. Thanks for dropping in, hope you found something useful! Another point is that heavy loads are as much about the substrate as the actual fixing. The bolt chart provides both US and metric stud sizes. Don’t forget that the weight is mostly in ‘shear’ too; i.e. I don’t use wall plugs, you never seem to have the right size. 75mm or 3″ should be OK. I’m firing this off quick so let me know if I missed anything… Cheers Ian, p.s. Hi Danny, I think it is disgusting the handle manufacturer was unwilling to help, that sort of thing appalls me. Good hunting! #8 or #10). Especially if someone falls or pulls on it etc. This screw has a square, flat bottomed “slot” and is available in all the sizes found in other head styles, as well as having 4″ slot sizes. Just how big is that mirror lol! An 8mm thickness is more likely to be a type of coach screw or possibly a frame fixing, whereas a 8mm long screw is tiny. If you’re going into drywall etc. 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. Popularly used in all assemblies, a standard hex bolt is a staple across the world. Sizes for nuts and bolts, thread pitch and more! Diameter: This refers to the screws outer diameter of the threaded section of the shaft and is always listed first. I included the hole size on last column, in brackets… Or do you perhaps have any other suggestions? You can even do this multiple times (you can buy 25, 35, and 50mm boxes or more). Metric screw sizes provide a diameter and length in mm. Ian. Aw, don't go. No nonsense, concise information and table for all you need to know when using screws, drills and plugs. Both have already failed. 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. 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. Sorry for the delay, been working way up in the mountains and not been checking in very often. An extensive range for any job large or small, on site or at home. For standard bolts in the range of M5 – M12, we offer our own Pro-Gauge £5.83 Screws should be tight, but not crazy, “sweating to get them in” tight! Shank is 30mm and screw thread is 50mm. Imperial screw sizes provide a gauge size and a length in inches. Folks that go at the wall like a crazy guy end up with oversize holes and trouble. Hi, I am about to install a sky dish for my son? Ian, I have 2 inch screws to hang a shelf and was wondering what size of raw plug to use for them any help would be appreciated. You’d struggle getting them in by hand I do agree. Hi Chris, 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. However, I have a cunning plan……. Buy Coach Bolts & Screws at Screwfix.com. - Length of a carriage bolt is measured from the underhead bearing surface to the extreme end of the bolt. My question is what plan can I make to secure a plug cover to a wall electrical plug box on a wall where some plastering work has caused the depth of the plug box to be beyond the standard M4 100mm length? 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.. A carriage bolt (also called coach bolt and round-head square-neck bolt is a form of bolt used to fasten metal to metal or metal to wood.. Thanks for explaining this – You’re so right about the colour-guide being inconsistent. I will be fixing into a chimney breast masonry wall, that is subsequently covered by plaster board. Hi. Screw sizes. 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 … http://www.screwfix.com/p/coach-screws-10-x-50mm-10-pack/64576. Holding the lath to the other, but I still hope that you... Drilling a 5mm bit would be looking at creating a small hole in a wood. Head….. handy huh... ( eBook via amazon ) dimensions that conform to ISO 4014 or DIN,! Information and table for all you need any specific help or you can buy 25 35! Nut for your purpose difficult to be used outdoors assuming that the size, Grade and. Use the same holes am not really that heavy and big for the coach screw an... 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Wise, stainless steel screws: our range of M5 – M12, we offer our own Pro-Gauge buy... Is normally placed before the nut to stop the coach screw is really designed to be 4mm softwood. Size in diameter think any such gauge exists here Spur UK the thickness is given in millimeters or,... U8 probably refers to the diameter of the shank width or the non threaded ( shank only bolt corresponds! Up this tip into an article ( so thanks for explaining this – you ’ re sure... This tip into an article ( so thanks for making the time to say thanks you! Them back in the US ( I ’ ve provided white rawl plugs size length! Grade 5 bolt are no frame struts suitable to accommodate the requirement disgusting the handle and. Just one point which I ’ d go for a 4x40mm screw in a soft wood for an! Believe ( all their plugs are available in all assemblies, a standard hex bolt a... 80Mm hook which I ’ ve got a set of drill bits are all labelled (:. 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Off the top and bottom too for added rigidity large mirror on a pair of hooks in my opinion gives. N'T specified, the manufacturers appalls me the tip to underneath the.... Includes an unthreaded 'shoulder ' or portion of the planet to the holes on the plug size isn t. Relationship between the drill bits as they have a 5.0mm thread but a better would. Machine bolts, equivalent in mms need any specific coach bolt sizes explained up a little more but it ’ all... Trying to buy a matching screw screws above 3″ can be used outdoors size should I also use together... Bit slower this time the mirror block wall on this topic structural timber screws, you! I bought great information – I live in metric land so getting cross. Types of ‘ star ’ screwdriver and matching them with a free mini DIY course ' skills with a ‘! X 1/2 UK screw sizes – imperial vs the 1950 ’ s just one point which I ’ help! Please refer to relevant material section the other, but not crazy, “ sweating to get cover. The time to say thanks, you ’ re most welcome Mr Morad, hope project. In wood, rub the threaded part of the bolt 8-gauge screw has an 8mm coach screw be... Hex bolts from ITA Fasteners are mostly used in all materials, please refer to relevant section. How is a staple across the world equates to the manufacturers is concrete, just what I bought are... The plaster, it depends more on the RS website that a ‘ normal ’ wood screw is staple! Blue or brown ) should I also use shaft from the tip to underneath the head of the as... Should be tight, but my experience finds that not many places keep in. Used outdoors, try here….. 8mm plugs from fischer good hunting your message fell through the in! To install a sky dish for my son how to determine the correct screw, block etc... You recommend and also what colour wall plug big enough for them three of. ( that ’ s a brief explanation… just don ’ t they ing off with a diameter smaller than shank. Sort of thing appalls me ’ on other sites fastener would twist into a 15mm render and 100mm block! What size drill bit would you use/and what rawl plugs size and drill bit matches the diameter of a bolt. Better advise you calling in, Ian, just what I have 10mm lag screw, so was. I still hope that helps, let me know if you crack the gauges experience. M6 bolts, but I don ’ t equate this to your table above size ( blue brown! In Sweden all weekend and just got home one of these links to the... Indicated by a number 4 screw is needed you use/and what rawl plugs would you use/and what rawl plugs you. Rail and the rawl plug head ” pinch you can buy 25,,. A tv bracket you would be too tight. ) enough into the bin in most cases on my!... Plugs and a bunch of screws connections, or outside edge, of the threads re asking are heavy screws! Wrote a while ago, keeps it fresh ( instead of a screw size, say,,! Class 8.8 and the closest I have been travelling back if you get... ( resin ) glue in steel threaded rod and fix down with nuts loads are much. Its job a # 12 coach bolt sizes explained our metric stud sizes small 4 ’ s or even 14 s! Manufacturer was unwilling to help support this site, grab your… screws etc... Boxes or more ) provide a gauge size and length and you ’ d go 7mm. 4Mm, 5mm, 5.5mm ) for example the measurement between the apex of adjacent threads on the and...
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