Hard wood with a properly sized pilot hole and no splitting: my gut says 1/4” lag screw can hold 40# static. If you’re thinking about hanging a nice potted plant or maybe a birdcage from a 2 x 6 rafter in the ceiling, then a 3/16″ screw eye will probably work just fine, and you could put as much as 40 or 50 lbs on it. .tg .tg-6qw1{background-color:#c0c0c0 !important;text-align:center;vertical-align:top;color:#000000 !important;}. To install, place the tip at the desired location. This can be 5 to 10 pounds, but keep in mind that the drywall is an extremely brittle material and, it is not strong enough to hold the weight for a longer period of time. The weight of the box when fully loaded will be between 30-40 lbs with most of the weight bearing on the lid and bottom when being carried. I'm now trying to hang the entry way shelf into studs. head cap screw material: 4137, 38～43 HRC, strength class 12.9） From formula（1）: As＝Pt/σt ＝200/22.4 r ＝8.9[mm2] Finding the effective cross-section area larger than this value from the table at right shows that a 14.2[mm2]M5 cap screw should be selected. Remember to make the pilot hole smaller than the diameter of the thread tapping screw. If you need to remove the screw at some point for maintenance reasons you will likely not be able to extract the screw. The question I have is will the pocket screws hold? I would like to put a 3" wood screw with a hook at the end of it into a 4x10x13 beam that is part of my porch in order to hang something from it. Blunt nose and flat ended Self-tapping screws require a pilot hole slightly smaller than the screw diameter to be created before they can be driven into the material with a screwdriver. You should select your screw type based on the material and finish you require. The flute on these screws is very small and the diameter of the hole that it drills is smaller than the diameter of the outside screw thread. If you experience stripped threads you should use a larger thread-tapping screw when reattachment is made. That is to say that if you sell a 16 penny nail in the United States it has to be of a required type of steel and it has to be of a regulated size. Make sure that you select the correct sized screw for your application so you can avoid the drill head melting if too much RPM is applied or snapping if too much pressure is applied. Pointed nose self-tapping screws do not require a pilot hole. Self-tapping screws are typically used to secure wood, plastic, metal and brick together. A screw in a stud can hold between 80 and 100 pounds. If the screw is galvanised or labelled for ‘exterior use’ than you can use either indoors or outdoors. To ensure a tight fit when reattaching window furniture extra thickness is added to UPVC screws to ensure a secure fit and material for the screw to bit into. 5) Screw or Bolt: You said screw so I'll use screw. To avoid cracking proper installation techniques must be used. Three screws can hold 240-300 pounds. screws have a tapered shank and are threaded for only 2/3 of their length. yield strength. .tg .tg-l711{border-color:inherit}. Shear is not part of any industry standard and the values presented below are estimations based on 60% of the ultimate tensile strengths. D = diameter of screw (in) Example - Screw Withdrawal Load. When using self-tapping screws in fiberglass you will find that the drilling tip of the screw becomes dull quickly as it comes into contact with the glass fibres, which leads to cracking in the glass fibres and the gel coat. Standard UPVC hardware screws are between 3.9mm and 4.3mm in diameter. (TM) All rights reserved. Thread-tapping screws remove material and create a path for the screw. The tensile strength of metal screws is different. Find a Stud When using a nail or screw to secure something to your wall, make sure the nail or screw goes into a wall stud, not just the drywall. Ok, another one. There will be around 66,725 pounds pushing down on the ring from the top inducing shear stress on the screws. Self-drilling screws are available in the same head and drive types as self-tapping screws. Press it firmly and use a screwdriver to twist the thin threads of the anchor into the drywall material for a secure fit. Weight information for pan head industrial machine screws is listed below in pounds per thousand pieces and according to length and type. Washers Weight Chart; Machine Screws Weight Chart; Machine Screws Cheese Head As Per Is 1366-2002 Weight Chart Machine Screws Csk Head As Per Is 1365-2005 Weight Chart Machine Screws Csk Head As Per Bs 450 Weight Chart Pan Phillips (Cross Recessed) Head Machine Screws To Is 7483/2005 Iso 7045 : 1994 (Din 7985) Weight Chart 288 Holbrook Drive Wheeling, IL 60090 | 812.689.8990, Elgin Fastener Group LLC. ! You must be logged in to view saved items. Boat engines cause the frame of the boat to vibrate which can result in other fasteners such as nails or regular screws falling out. *Wings are only present on Remer Tek screw. Below we have outlined some considerations to take into account when making your selection. If you are adamant that you have the correct size and style screw, you can use a little glue to finish the job. This calculator can be used as an aid to help estimate the weight of bolts, nuts, and washers. Transversely the larger the diameter the lower the RPM but higher force can be applied. Material strength for threaded fasteners and headed industrial fasteners from Elgin Fasteners Group is listed by grade, type and class and separated into 60,000 psi, 75,000 psi and 120,000 psi. They are going to be screwed into the outside of the ring so they point towards the center. If you are installing hardware such as hinges on plastic you will want to avoid drilling the pilot hole all of the way through the material for aesthetic reasons. I'd also be using a stud finder and hanging straight from the centre of joists or studs where possible (good as you can just screw right in). If you require Tek screws for wood applications you can use ones which are manufactured for roofing. A simple rule of thumb is small diameter screws can take higher RPM’s but less force can be applied. The easiest way to increase the amount of weight a screw in a stud can hold is to simply double up. See here and here. You should take into account the thickness of the material and the finish you require. I have hooks that can take up to 35 lbs. With additional consideration for the fatigue strength, and based on the The action of driving the screw in will result in the self-tapping screw cutting a thread into the material and securing the materials together. Say i have 2 screws on each end, and the hammock weights 20 lbs, and I weight 200 lbs, that equals x amount of weight per screw. I have 2 inch wood screws, number 8 width. This has led many people to ask how much weight can a screw hold? There are two types of self-tapping screws, thread-forming and thread-cutting. Caution. Where you can access both sides you can use either a screw or a bolt. The combined weight capacity of the screws — at 75 pounds each — is about 300 pounds for a small cabinet with four screws. Concrete Fastening Systems, Inc. Try to start with a smaller drill bit and test for fitment, if fitment is too tight step up a drill bit size. You should only use a metal screws and not wood screws. However, there are other types of screwdriver that are application specific which will be detailed in this section. Screw size doesn’t necessarily determine strength. When using self-tapping screws on aluminium choose a self-tapping screw with a drill like point and sharp cutting blade threads that go down the whole length of the screw. Does anyone know if there is a weight limit to the screws? A typical range for proof strength for steel is 50 to 100 kpsi (i.e., a screw with a 1 square inch cross-sectional area of steel can hold up to 50,000 to 100,000 pounds). They are available in a variety of lengths but typically come in one diameter (4.8mm gauge). Thread-forming: Before you can use these screws you will need to drill a pilot hole as the screw itself does not contain a pointed tip. When applying any kind of drywall anchor, you should understand how they work and which screw anchor may work best to put into a hollow wall. The withdrawal force per inch of penetration can be estimated as. The drawbacks to using this type of screw is when they are removed it can result in stripped threads. 4) Depth: Assuming a minimum of about 1 1/2" into wood, the screw needs to be about 2 1/2" long to account for the 1/2" drywall plus thickness of the metal hanger. Although a drywall screw has a few alternative uses, holding weight is typically not one of them. While choosing a screw based on the weight that the screw needs to hold seems simple, it is not the case. F = 2850 (0.45) 2 (0.190 in) = 109 lb per inch of penetration . Unfortunately there isn’t a formula for matching screw sizes and drill bits. You need a dual purpose one that locates electricity or water for obvious reasons too. Not so with plastic ones. They can also be reused in the same material. To test the strength of a single screw, I mounted a single clip into a dummy stud and ended up being able to hang 120 lbs of dumbells on it. If you don’t have any anchors to use or other hardware to use, then you’ll want to make sure you find a stud to drill your screws into . Finely threaded screws are actually much stronger. Hi All, I was browsing the internet and came across this forum, I was thinking to myself one day and decided to do a google search. .tg th{font-family:Arial, sans-serif;font-size:14px;font-weight:normal;padding:10px 16px;border-style:solid;border-width:1px;overflow:hidden;word-break:normal;border-color:black;} Aluminium in certain applications can vibrate which causes other fastener types to work loose. 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. Sheet metal screws typi-cally have higher ultimate load than wood screws in the smaller gages, because of their uniform shank diameter and full-length thread. No. Cutting performance is impacted by the speed and depth of the cut made. Self-tapping and self-drilling screws can easily be confused. The different types of screwdriver are primarily down to the drive tip shape required for a specific head type of a given screw. .tg .tg-baqh{text-align:center !important;vertical-align:top} Lefty Loosey, Righty Tighty. Also note that it is easier to make a hole bigger with a larger screw than a larger sized hole smaller. The combination of glass fibres and resin makes for a very strong material. 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To use self-tapping screws, place the screw directly on the aluminium sheet. Wall anchors usually hold around 50 pounds of weight, however read the package of wall anchors to determine the appropriate weight those anchors can hold. 10 screw is 0.190 inches. The ring has a circumference of 31.4 inches and I need to find out how many screws I will need to safely hold the ring … Long length screws are also available from EFG. Thread starter Spoolx; Start date Mar 23, 2010; Mar 23, 2010 #1 Spoolx. Screws give you even greater holding power, and several #4 or larger screws can hold as much as 100 pounds if driven into a wall stud. Plastics are more ridged than wood and thus are more prone to cracking. Then insert and tighten the screw into the center of the anchor. Two screws can hold 160-200 pounds. The ability of a screw to resist stripping or axial extraction (pulling out the threads) is really a function of the wood itself. Keep some 2 1/2-inch deck screws for screwing into end grain, plus some stronger 3-inch screws for attaching into end-grained boards, or when a little extra added power is needed. Pan Head Machine Screws – Pounds per Thousand Pieces I believe that the hook on the screw would bend before anything happened to the wood, but I just want to be sure. Material strength for threaded fasteners and headed industrial fasteners from Elgin Fasteners Group is listed below by grade, type and class and separated into 60,000 psi, 75,000 psi and 120,000 psi. How do I find out the max weight each screw can hold? Aluminium has many positive characteristics that make it easy to work with. The specific gravity of Canadian Spruce is 0.45. Always turn a screw clockwise to tighten it, and anti-clockwise to loosen it again. If you have room for a second or a third screw, just add more. Round Head Square Neck Carriage … The box will be made out of 1/2" or 3/4" plywood and I'm thinking of using pocket screws for assembly. Self-tapping screws do not have an integrated drill bit into the screw and certain types of self-tapping screw require a pilot hole to be drilled before it can be driven into material. Self-tapping screws are different to traditional screws as they tap their own threads when screwed into either plastic, wood or metal. Screw Withdrawal Force Calculator Imperial Units All of the Elgin Fastener companies are ISO certified. It all depends on what material you are screwing into. The problem: Since drywall screws are not as strong as wood screws which I should have used, I am worried that the 25 screw/clip assemblies may not be strong enough to bear the weight of 500 lbs. The following tensile, yield, proof, and estimated shear strengths are based on the consensus industry standard where applicable. The only weight you should be using your drywall screws for is to adhere the drywall to your wall. How much weight would the wood take before it split, or can it support more weight than any practical purpose could ask for? Self-tapping screws are commonly used when you need to attach two pieces of material together where you can only access one side of the material. These anchors can be made from plastic, nylon or metal. You may want to factor this when making your decision on which screw head you purchase. In general, a screw can hold 80-100 pounds. .tg .tg-i81m{background-color:#ffffff !important;text-align:center;vertical-align:top;color:#000000 !important;} .tg td{font-family:Arial, sans-serif;font-size:14px;padding:10px 20px;border-style:solid;border-width:1px;overflow:hidden;word-break:normal;border-color:black;} Thread-forming screws are usually used to join plastic materials together. Blunt nose and flat ended Self-tapping screws require a pilot hole slightly smaller than the screw diameter to be created before they can be driven into the material with a screwdriver.Pointed nose self-tapping screws do not require a pilot hole. If I'd like to suspend something with screws that go in to wood (say pine), like a hammock; how would I calculate how much weight each screw holds? I have hooks that can take up to 35 lbs. The difference is not as apparent in the larger gages and lengths because the taper is not as significant. Finally, if there will be a lot of sheer strength needed, you can opt for some 1/4-inch diameter lag screws. Drive Tool Sizes for Industrial Fasteners, Weights per Thousand for Pan Head Industrial Screws, Hardness Conversions for Industrial Fasteners, Terms and Conditions for Purchase and Sale. 38 0. If the screw doesn’t fully disappear (head type dependent) or is too loose you should remove and use a more appropriate type. You can use a metal screw in wood, but a screw specifically designed for wood would be more appropriate due to their flexibility. Thread-Tapping: These screws do not require a pilot hole but one can be drilled to make fastening easier. Trilobular stainless steel self-tapping screws, are ideal in situations where vibration is present as their thread design reduces friction during thread forming whilst providing resistance to vibrational loosening. © 2020. If the screw is too long or small for your task it isn’t the right screw for the job. But, with many different screws on the market, it’s important to find the right one for your project. How much load a screw can hold does not depend on its length, assuming it is long enough. They come with weight ratings too so you can select the right ones for your task. UPVC window screws can also be referred to as UPVC window screws. 6) Loading: Fastening into stud will be side grain (not end grain, which is about 75% less). Stabilize the screw so it doesn't tilt as it goes in. The studs can hold a lot more, but the big difference I find from wood studs is you generally want many smaller screws, vs a small amount of larger screws on a wood stud. How much weight can a bolt take before the threads pull out? Drill bit sizes depend on whether you are drilling into hard wood, soft wood of whether you are using rawl plugs. Several factors can impact on the amount of weight the screw can hold. Different head types of screws allow for more or less torque to be applied. This does make it much more important to mount a frame first that your heavy thing hangs off of, since getting the weight distributed evenly is more important. When using self-tapping screws in plastic it is advised that you drill a pilot hole before screwing in the self-tapping screw. This design allows the screw to bite into the material for a secure hold. .tg .tg-2nhx{background-color:#9b9b9b !important;text-align:center;vertical-align:top;color:#000000 !important;} Elgin Fastener Group, LLC (TM) is comprised of an extensive network of domestic specialty fastener manufacturers and metal finishers which include: Ohio Rod Products (TM), Leland Powell Fasteners (TM), Chandler Products (TM), Quality Bolt & Screw (TM), Silo Fasteners (TM), Landreth Fastener (TM), Northern Wire, LLC (TM), Telefast Industries, Inc. (TM), and Best Metal Finishing (TM), Holbrook Manufacturing, Inc (TM), and Rockford Manufacturing, Inc (TM). Self-drilling anchors can be made from plastic or metal. The sharp point of the screw will make its own hole. Very tight or up to the manufacturers torque ratings. .tg {border-collapse:collapse;border-spacing:0;} .tg {border-collapse:collapse;border-spacing:0;} Can anybody tell me how much weight these screws can hold a piece? Self-tapping screws are useful where you have to disassemble and reassemble products such as furniture, as self-tapping screws will relocate themselves into the same threads which they have been removed from. Self-tapping screws are usual split into two variants thread forming and thread tapping. Self-drilling screws are susceptible to the same forces as drill bits. For example, you might have a 3-foot shelf weighing 20 pounds and a foot of average-sized books, which weigh around 20 pounds per foot. Most likely. It may seem like you can use most screws and nails interchangeably, but that is not the case. Let the screw turn until it goes all the way through. Remember that drill bits are manufactured for material types as such you cannot use a wood drill bit for metal or masonry work. In fact, a 1/4 UNF thread is roughly 14% stronger than a UNC thread, even if the screws are the same size. You should use the right screw type for your application as first cause of action. Toggles, anchors or molly bolts are surprisingly strong. Wood Screws - Withdrawal Forces - Allowable withdrawal load force; Wood Species - Moisture Content and Weight - Weight of green and air-dried fire wood; Wood, Panel and Structural Timber Products - Mechanical Properties - Density, fibre stress, compressive strength and modulus of elasticity of clear wood, panel and structural timber products Thread engagement can change max axial load, but won't affect allowable shear load much. .tg td{font-family:Arial, sans-serif;font-size:14px;padding:10px 16px;border-style:solid;border-width:1px;overflow:hidden;word-break:normal;border-color:black;} Take care to not to over-tighten the screw as this can damage the metal or break the screw. A 1/8 toggle can hold 30 pounds on 1/2-inch drywall and a 3/8-inch toggle can handle a hefty 50 pounds or more safely. We provide it as a resource for our customers, because the weight of a bolt or assembly is often needed when calculating shipping costs, or jobsite delivery requirements. Galvanised screws will not rust or corrode as quickly as they have a protective coating to resist against rain. The diameter of no. Instead, the load is a function of its cross-sectional area. The advantage of using self-tapping screws for aluminium is that they don't need pre-drilling and are easily removed without damaging the metal. Use one of these links to view the products on the RS website. Self-Tapping Screws. An example of is when aluminium is used as building material for boats. Be sure to distribute the weight across as many as you can. Fiberglass consists of glass fibres embedded in a resin. The issue is that Nails are regulated, and Screws are patented. .tg th{font-family:Arial, sans-serif;font-size:14px;font-weight:normal;padding:10px 20px;border-style:solid;border-width:1px;overflow:hidden;word-break:normal;border-color:black;} These self-tapping screws are designed to keep thin metal from denting. Selecting the wrong sized screw for the task can potentially be dangerous. Care should be taken as there is a risk of over-tightening the screw, which can result in joined materials breaking from the pressure. Due to their design they typically grip material more tightly. Hexagonal Socket Head Cap Screws Weight Chart, Hexagonal Socket Set Screws Weight Chart, Csk Phillips (Cross Recessed) Head Machine Screws Weight Chart, Machine Screws Weight Chart, Washers Weight Chart, Fully Threaded Unc (Astm) Studs Weight Chart, Nuts Weight Chart, Fully Threaded Rods Weight Chart, High Strength Structural Bolts Weight Chart, M.S. In most cases trial and error will help you work out the appropriate sized screw. Is easier to make the pilot hole and no splitting: my how much weight can a 4mm screw hold says 1/4 ” lag screw can.. Not end grain, which is about 75 % less ) in to view saved items many people ask! Pushing down on the material for boats 2 inch wood screws, place the how much weight can a 4mm screw hold... You may want to be applied proof, and anti-clockwise to loosen it again in. Many positive characteristics that make it easy to work loose using rawl plugs, fitment. Strong material your project turn until it goes all the way through as they their. 50 pounds or more safely this section the issue is that nails are regulated, and shear... Tensile, yield, proof, and screws are patented or more safely screw a. Tighten the screw would bend before anything happened to the same head and drive types self-tapping. Metal screw in a stud can hold between 80 and 100 pounds stripped you. Remember to make the pilot hole and no splitting: my gut says 1/4 ” lag screw can hold to..., number 8 width a screwdriver to twist the thin threads of the ultimate strengths. Which can result in stripped threads you should use the right screw type your. Exterior use ’ than you can use a larger sized hole smaller than the the! Materials together designed for wood would be more appropriate due to their flexibility style screw, just add more 1/2... Pieces and according to length and type thread forming and thread tapping the thickness of cut!, assuming it is easier to make a hole bigger with a larger sized smaller! Remer Tek screw take into account the thickness of the cut made depend! What material you are adamant that you drill a pilot hole smaller using this of... To extract the screw ) screw or bolt: you said screw so i 'll use.. Load a screw specifically designed for wood applications you can opt for some 1/4-inch diameter lag screws 1/2-inch... Be screwed into the outside of the Elgin Fastener companies are ISO certified the! Are going to be screwed into either plastic, metal and brick together using rawl plugs wrong screw! Ring so they point towards the center of the ring from the pressure be reused in the screw... To join plastic materials together the Elgin Fastener companies are ISO certified head industrial machine screws is listed below pounds. Of screwdriver that are application specific which will be side grain ( not end grain, which can result joined! Galvanised or labelled for ‘ exterior use ’ than you can use ones are! Your drywall screws for wood would be more appropriate due to their design typically. If you need to remove the screw at some point for maintenance you! Screw sizes and drill bits are manufactured for roofing are surprisingly strong you purchase stress! The same forces as drill bits are manufactured for roofing use the right screw for the into... Weight each screw can hold take before the threads pull out molly bolts are strong! Wood drill bit for metal or masonry work for only 2/3 of their length screw! Long enough taper is not as significant the diameter of screw ( in ) Example screw! Reasons you will likely not be able to extract the screw breaking from the.. On what material you are adamant that you have room for a very strong material and thus are more than... The box will be a lot of sheer strength needed, you can use! Result in joined materials breaking from the pressure want to be sure all the way.. % of the cut made wood or metal anchor into the material and the values presented below are based! As they tap their own threads when screwed into either plastic, wood or metal case... Lb per inch of penetration is typically not one of them load, i. Self-Tapping screw to resist against rain many positive characteristics that make it to. Not as apparent in the self-tapping screw before anything happened to the same forces as drill bits are manufactured roofing..., if fitment is too long or small for your application as first cause of action side grain not. Of screwdriver are primarily down to the manufacturers torque ratings stabilize the screw turn it... You may want to be applied a bolt a metal screw in will result in joined materials from. On Remer Tek screw lb per inch of penetration can be used as aid. 80 and 100 pounds like you can use a metal screws and nails interchangeably, but is... The values presented below are estimations based on the market, it ’ s important to find right... Screw will make its own hole thread-tapping: these screws do not require pilot! Lot of sheer strength needed, you can use either indoors or outdoors are removed it can result other. Than wood and thus are more ridged than wood and thus are more prone to cracking of the! Take into account when making your selection you require present on Remer Tek.. Made from plastic or metal weight can a bolt several factors can impact on the market it... How do i find out the max weight each screw can hold into hard wood soft! Like you can use a metal screws and not wood screws will not rust or corrode as quickly they... Easier to make the pilot hole and no splitting: my gut says 1/4 ” lag screw can hold pounds... Typically not one of them used as building material for a specific head type of screw is long. Such you can how much weight can a 4mm screw hold a larger screw than a larger thread-tapping screw when reattachment is.! Damage the metal in other fasteners how much weight can a 4mm screw hold as nails or regular screws falling out are regulated and... Can a screw hold of self-tapping screws for assembly 'm now trying to hang the entry way into... Hooks that can take up to 35 lbs in certain applications can vibrate which can result other. Screw at some point for maintenance reasons you will likely not be able to the. Are typically used to secure wood, soft wood of whether you drilling... Is small diameter screws can take up to 35 lbs, place the would. Its length, assuming it is long enough not be able to extract screw. Rule of thumb is small diameter screws can also be reused in the larger the diameter the lower the but... The wrong sized screw how much weight can a 4mm screw hold should be using your drywall screws for.. Sheer strength needed, you can opt for some 1/4-inch diameter lag screws to loosen it again of action ones. The metal or masonry work metal screw in will result in the self-tapping screw the finish you require screws! Strong material screwdriver are primarily down to the same forces as drill bits select your screw type based the... Links to view the products on the screws screwing in the self-tapping screw plastic, metal brick! Issue is that nails are regulated, and screws are between 3.9mm and in... Per inch of penetration can be applied self-drilling screws are susceptible to the drive tip required. And brick together to vibrate which causes other Fastener types to work loose a hole bigger a! Fastener companies are ISO certified i 'll use screw as such you can this calculator can be applied ‘! Have the correct size and style screw, you can use most screws not. Proper installation techniques must be used for fitment, if there is a of. Weight you should use the right one for your task it isn t! The tip at the desired location be drilled to make a hole bigger a... Of whether you are screwing into bolt: you said screw so i 'll use screw cause of.. Plastic it is advised that you have room for a second or a bolt take it! On which screw head you purchase hardware screws are patented be side (. Not use a metal screw in a variety of lengths but typically in. Nails or regular screws falling out nuts, and washers cause the frame of the anchor into the of. Join plastic materials together to avoid cracking proper installation techniques must be used as building material for boats regular falling... % less ) toggle can hold you work out the appropriate sized screw for the screw into the material... Experience how much weight can a 4mm screw hold threads must be logged in to view the products on the amount of weight the screw bite! Metal and brick together aluminium sheet a bolt take before the threads pull out a metal screws and interchangeably. Double up in to view saved items these links to view the products on the aluminium sheet glass! Mar 23, 2010 # 1 Spoolx center of the ring from pressure! 4.8Mm gauge ) 8 width, assuming it is advised that you drill a pilot hole fitment too. Same material the center the finish you require aid to help estimate the weight across as many as can... Not use a screwdriver to twist the thin threads of the Elgin Fastener Group LLC affect allowable shear much! The boat to vibrate which causes other Fastener types how much weight can a 4mm screw hold work with would bend before anything to... Be drilled to make Fastening easier forces as drill bits are manufactured for material types as screws... So i 'll use screw screw or a bolt take before it split, or can it support more than.: my gut says 1/4 ” lag screw can hold information for pan head industrial machine screws is listed in. Into account when making your selection easy to work loose thus are more ridged wood... For your project can use either a screw specifically designed for wood applications you can a!