If the bolt body is the same for all bolt types, then the head is the complete opposite. Do you need to take your chances with any bolt that goes in the hole or give up the task altogether? Additionally, tolerance positions can be of the following types. You must use left hand threaded screws with left hand threaded nuts. Compatible internal threads must have the same geometry as the threads on the bolt. See also (link): In general, the first thing that you should do is consider whether youre using a bolt thats shorter or longer than 6 inches. bolt m42 anker 125mm bouten industrylane The stress is correlated to the TPI of the bolt. hb``e``nX,oxK{vkXZZZGi)1x 0000042609 00000 n
Now, after centuries of metal-working practice, threaded fasteners are manufactured to precision tolerances and must meet the robust demands of todays high-efficiency, high-performance marketplace. Chambers, Jeffrey A., "Preloaded Joint Analysis Methodology for Space Flight Systems," NASA Technical Memorandum 106943, 1995. These grade marks are given depending on how many pounds per square inch (PSI) the bolt can hold. The following table of hex bolt head dimensions was adapted from ASME B18.2.3.1M, Table 3, "Dimensions of Hex Cap Screws.". V`QfX#(zG~SD6w 0000062122 00000 n
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Coarse thread is beneficial, because they are less likely to cross thread, more tolerant in adverse conditions and facilitate quick assembly. Now that weve covered all the technical aspects of a bolt size chart, lets look at an example to cement this information. The value of H is related to the thread pitch, P by: In the table above, dnom is nominal diameter in millimeters and P is the thread pitch in millimeters. %PDF-1.7
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The following table of clearance holes was adapted from ASME B18.2.8. 0000026883 00000 n
On the other hand, if you use a bigger-sized bolt that you need to use enough force to push it in, you can damage the hole. Based on the results, the metric bolt size chart shows that you can fit an M14 bolt into the 13mm hole. Coarse threads have a larger threadform relative to screw diameter, whereas fine threads have a smaller threadform relative to screw diameter. This isnt the only thing thats different, though! What about thread fit classes? comprehensive of all available standard threads Heat treated, oil quenched, tempered at 800 Deg (F) min. %PDF-1.6
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Use our Fast Order Form
if you know what product
codes you'd like to order! The minimum hole diameters are given. The bolt tensile strength is another essential bolt specification. Training Online Engineering, Fastener 0000053763 00000 n
Whereas cold working hardens the minimum diameter, cutting abrades it and weakens the material surface. The second number of a UTS bolt designates the threads per inch (TPI). Definitions of terms are located below the chart. Are you finding yourself a little confused, or do you need a quick refresher? Metric fastener threads are also specified according to thread pitch, which is the distance between adjacent threads, again in millimeters. Now, lets take a look at some bolt size charts that cover both the standard and metric measurement systems for bolt dimensions as well as bolt tensile strength. 0000131823 00000 n
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Lengths commonly range from 1/16 inch (0-80 x 1/16) up to 24 inches (like 1-8 x 24). UTS thread types are typically labelled UNC (Unified Coarse), UNF (Unified Fine) or (Unified Extra Fine (UNEF). Medium carbon alloy steel. 0000117710 00000 n
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First, you need to convert the fraction to decimals. The first column contains bolt grades (standard) or classes (metric). Never let thread length get the best of you with our help from ASMC. Sign up for our bi-monthly email newsletter for all the latest! Coarse and fine threads each have impressive advantages to their credit. .3754 =/4 x (.75 - (.938794 x (1/16))). 0000004582 00000 n
Youll most likely use coarse threaded bolts, which have a lower thread count. 0000057273 00000 n
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]M"% There are some constraints, such as limits on thread length and bolt diameters, and some materials are too hard to be cold worked by dies. Beyond 24 inches, use threaded rod. What about using a metric bolt size chart? [D2C U )"@mH}H(C'? Y
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bolt thats 6 inches or shorter has a 1.25-inch thread length. The following table of hex bolt head dimensions was adapted from ASME B18.6.3, Table 29, "Dimensions of Plain (Unslotted) and Slotted Regular and Large Hex Head Screws." Bolt heads have three essential dimensions: size across the flats, across the corners, and head height. 0000004192 00000 n
Online Books & Manuals This bolt has a hex head, is 2 inches in diameter, has 4 1/2 threads to the inch, and is 8 inches long. 0000211869 00000 n
hbbd```b``Y "sA$3d]"HI 29D|GI In fact, there are two methods used to manufactured threadsrolling and cuttingthat affect fastener functionality. Sizes M20 - M50, Screw Thread Designations, Minor Diameter, Major XA)1~cd}w0dlc3co1XEl?N1oh;ckgSlBR+w[H38,O#`N "]fPG 3
After all, most compound machines are hybrids of simple machines. 8 Thread Series (8UN)is the specified thread forming method for several ASTM standards including A193 B7, A193 B8/B8M, and A320. 0000185912 00000 n
Say, youve drilled a 33/64 inches hole, then 33 divided 64 is 0.515625 inches. 
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UTS bolts that have diameters of less than 1/4 inch are provided gauge numbers, but inch measurements are used between 1/4 and 1-inch sizes. So, lets look at some bolt proportions and dimensions. Now that youve got the terminology out of the way, you can look at bolt size charts with more ease.
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You can use the same method to read a metric chart, but keep in mind that all measurements are in millimeters. The first is a 3/4-10 UNC screw.
Different Types of Roof Sheathing and Their Benefits. The thread size designation for metric thread is given as "M[dia]x[pitch]". Every metric bolt is assigned a class number in terms of megapascals (MPa). These fasteners are cold-worked, which hardens the threads. Adhesive Dispensing Equipment & Accessories, Chemicals, Lubricants, Paints & Cleaners, Multi-Purpose Tools Corded Parts & Accessories, MIL Spec Fasteners and Aerospace Fasteners. Do you know the difference between rolled threads and cut threads? hW[O:+VziC()D?3v(m)2=}Fpq`va`(F8Di"$Z(8WL}_H! GOC>8kH'hx(_q'@%yv0y@4Sx,Ank&p;HJq^oJOA!a5fS:^eYJ/g](h!83:SvH-$ 0000056851 00000 n
As for the metric chart, it more or less follows the same format until the third column. Thread fit categorizes the tolerances between the peaks and valleys (crests and roots) of mating threaded hardware. Watch this 60 second tutorial video in order to turn yourself into a fastener search expert! Next, to convert the decimal to millimeters, multiply the decimal by 25.4, which gives you 13.096875mm. The following equations can be used to calculate dimensions for ISO metric threads. 0000030444 00000 n
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chart bolts fasteners pitch hardware metric thread table blinds ford shutters blind shades nuts computer window welding trailer screws nut Metric bolts, however, have super fine thread pitchgranted that only bolts M10 and M12 have super fine thread pitch options. Youll find two extra columns: one for Outside Eye Diameter and one for Inside Eye Diameter. Youll most likely need to know the bolt head diameter to determine the wrench size to tighten or loosen the bolt. Then click the Send button to send your friend an email. These charts can give you a general idea of the tensile strength of standard and metric bolts as well as the material theyre most likely made from.
Still, there are some oddly shaped bolts out there. 0000137397 00000 n
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In standard bolt size charts, the thread pitch is the number of threads in one inch. 0000060590 00000 n
Check the Head Height/Thickness column to ensure that a bolt lays flat to where its screwed. ANSI Internal Screw Threads Size Chart, External Thread Screw Threads 66 0 obj
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The second screw has the same diameter, but a different TPI; it is a 3/4-16 UNF screw. Houston, TX 77021, Toll Free: 800-747-1821 Only for fast and easy assembly and disassembly; rarely used. The next clue narrows things down for us. For example, a bolt labeled M10 x 1.5 is a metric bolt with a 10 mm diameter and 1.5 mm between threads. Our metric stud bolt to nut table is meant to help determine the correct size bolt or nut for your purpose. Its the maximum stress a bolt can handle before it breaks. 0
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and Screw / Bolt Design, Formula and Calculations. A medium carbon alloy steel steel, heat treated, hex tap bolt with a machined point, which is fully threaded. According to ISO, global hardware popularity is split 60% metric, 31% UTS and 9% other. 0000094522 00000 n
Keep in mind that when I say bolt size, I refer to the bolts shank, not the head. Even in technical parlance, there is often no distinction made between screws and bolts. Copyright 2001-2022 Fastener Mart, LLC. Theyre commonly used in automotive applications and construction. For general use and DIY projects, grade 8 bolts are the strongest options available.
Canada, the United States and the United Kingdom were unable to fix each others tanks and vehicles during the war, so in 1949 they adopted the Unified Thread Standard (UTS) that outlined thread criterion using inch measurements. This column is to help you quickly find the equivalent or approximation of metric bolts. Engineering Forum 0000059778 00000 n
Functional diameter is a measure of the ability to assemble the thread. Note: This screw chart is not Less chance of stripping or cross threading, Coarse threads aren't as easily damaged by handling or during shipping, Some materials tap better when using coarse threads, Fine threads are better when tapping thin and hard materials, Larger tensile stress areas make fine threaded fasteners stronger in tension, Diameter: the larger the number, the larger the screw or bolt, Threads per Inch: the larger the number, the more fine the thread, Length: the larger the number, the longer the screw or bolt. Coarse threads are thicker and more durable than fine-threaded hardware. Include a message if you wish. The blank is deformed by dies to create the helical peaks and valleys that wrap around the bolt shaft. 0000004547 00000 n
hb```c``*``e`fb@ !G#K`[% screw bolt allen washer manufacturer fasteners Barrett, Richard T., "Fastener Design Manual," NASA Reference Publication 1228, 1990. 0000047387 00000 n
Heat treated, oil or water quenched, tempered at 800 Deg (F) min. 38JD{*.M[a2\;zH;]^oO+OMjV18#[x9L Youll notice that they all start with an M followed by a number. A-class threads are used for external threads and B-class threads are for internal threads.
This page provides tables listing sizes of inch and metric bolts, nuts, and washers. hb`````c```T Size Chart.
R2001) Nomenclature, are used. This table is used for smaller size hardware. AISI 1030-1541 or equivalent medium carbon steel. 0000010701 00000 n
Lag bolt size charts, however, have one extra column for Shoulder Length. Fasteners (bolts, screws, etc.) Generally, bolts and screws with cut threads have better shear strength but are also more complicated to manufacture and more expensive. The bolt body is the main shank with full or partial threads. In the metric chart, tensile strength is written as class numbers on a bolts head.
Excel App. These bolts are usually made from quenched and tempered medium carbon alloy steel, so they can withstand a tremendous amount of pressure. To fabricate rolled threads, a blank with a diameter slightly smaller than the designated end diameter is used. 0000054116 00000 n
This section contains tables of sizes for inch thread hardware.
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The following table of thread sizes for coarse and fine pitch thread was created using the standard sizes from ASME B1.13M. anchor m20 Lastly, threads on both metric and UTS fasteners are also categorized as coarse, fine or extra-fine. In all cases, the larger the number, the larger the size. 0000001216 00000 n
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As a rule of thumb, the more lines a bolt has, the greater its strength. All rights reserved. COARSE THREADS & FINE THREADS Coarse threads are those with larger pitch (fewer threads per axial distance), and fine threads are those with smaller pitch (more threads per axial distance). The following table of hex nut dimensions was adapted from ASME B18.2.2, Table 4, "Dimensions of Hex Nuts and Hex Jam Nuts.". Please enable JavaScript. ASME B1.1, "Unified Inch Screw Threads (UN and UNR Thread Form)," The American Society of Mechanical Engineers, 2003. Check out our bolted joint calculator based on the methodology described here. 0000310181 00000 n
Generally, the first column of a well-made comprehensive chart like the ones below or a size chart pdf contains the nominal bolt sizes. 0000268206 00000 n
The differences between todays bolts and nuts go far beyond dimensions. Oops, something went wrong. Two types of structural bolts, A325 and A490, cannot be rolled because of these restrictions. Thread fit is also a concern for UTS screws and bolts. These threads are also unlikely to strip if the bolt is made of a soft material. Pitch is also described as the number of threads per inch. 0000042500 00000 n
The next three columns contain the minimum and maximum sizes across bolt flats, corners, and head height.
Phone: 713-747-9944 Meanwhile, the metric system was gaining popularity in Europe and Asia, leading to the United Kingdom dropping UTS and adopting the metric system instead. Did you know that the easiest way to find what you are looking for on our website is to use the filters? DIAMETER (BODY DIAMETER) The smallest or largest pitch diameter that fits onto a screw or into a nut, including all of the form deviations such as lead, thread angle, taper, and roundness. When the pitch and crest grades are the same, the notation is simplified; a 4G4G bolt would be labeled 4G instead. 0000068961 00000 n
There are other common bolt materials as well, including: These metals are pretty strong and resistant, so dont worry if you cant find carbon or alloy steel bolts. csk Plain washers come in 3 series: Regular, Narrow, and Wide. 0000061059 00000 n
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Machine, Sheet Metal, and Thread Cutting/Thread Forming/Thread Rolling Screws Technical Information, Anchors Technical Information and Selection Guide, Inch and metric Materials, Mechanical Properties and Markings, Best Fastener Materials to Use with Metal, Why Purchasing Fasteners from a Distributor Can Save You More, September 2021 ASMC Industrial Newsletter. Fastener The thread profile is based on a parameter H, the height of the fundamental triangle. Now your company has the chance to leverage the high-tech benefits of todays novel hardware solutions. The higher the class number, the greater the bolts strength. 0000051351 00000 n
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When compared to UTS, 6g metric threads will be very similar to a 2A UTS bolt in terms of thread fit. In both charts, theres a minimum and maximum diameter for each bolt. How to Tighten Your Door Handle Quick & Easy! It took a global event of epic proportions (World War II) to foster international cooperation on bolt standardization. Trying to make sense of all the different screw and bolt thread lengths can be a real challengeeven for the most knowledgeable of professionals. Just make sure youve got a high bolt grade or class. ASME B18.21.1, "Washers: Helical Spring-Lock, Tooth Lock, and Plain Washers (Inch Series)," The American Society of Mechanical Engineers, 2009.
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Just like the metric bolt size chart, the metric classes chart has an additional column that contains the standard grade equivalent.
We do at Bayou City Bolt, and let us help you and your company with any of your bolt needs. 0000235824 00000 n
Add to that the difficulty of deciphering all of the figures and terms in a bolt size chart, which is nothing short of excruciating. Heres an example of a metric bolt specification: M5-1.0 x 20. Length is simply the length of the screw or bolt, in inches. Common threads per inch sizes are: 4, 4-1/2, 5, 5-1/2, 6, 7, 8, 9, 10, 11, 12, 13, 14, 16, 18, 20, 24, 28, 32, 36, 40, 48, 56, 72, 80. ANSI Hardware Menu Engineering Videos 
As outlined by Machinerys Handbook and ASME B18, screws are externally threaded fasteners that mate with internal threads or can be driven through materials to assemble components. In some cases, you might need to do some conversions if youre working with inches. With the largest market share, metric bolts are the most easily identified. Engineering Toolbox However, a longer engagement is required for fine thread applications than for coarse series threads to prevent stripping. Fine Thread Series (UNF/UNRF)is commonly used in precision applications. Diameters 1/4-7/16" AISI 1541 steel is acceptable. Fine pitch (and extra fine, if applicable).
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But it is easier to specify the components by a single size designation since the bolt and nut are mating components.). 21 0 obj
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Standards bodies have spent immense effort classifying thread pitch because it determines the thread tensile stress area, which can be discovered with this equation. All units are in inches.
That way, next time youre using bolts, you can take a quick look at the chart and find out exactly which one to use. For standard-size bolts, the thread pitch is either fine or coarse. For example, a thread with a nominal diameter of 6 mm and a pitch of 1 mm is designated as "M6x1.". 0000061524 00000 n
Metric thread vs. Unified Thread Standard? In the inch series, it is the number of complete threads per inch (if you need to know the pitch of an inch fastener, use the chart below or divide 1 by the number of threads per inch). Overall, rolling is a fast, efficient and less costly method of threading blanks. Diameter is given as a one or two digit number for smaller sizes, and as a fraction for larger sizes.
as provided by the standard. Their smaller pitches and greater TPI equate to better tensile strength, and a larger minor diameter provides better shear strength. 0000117978 00000 n
Please enter your friend's name and email address, and your name and email address below. The second column has the tensile strength of each grade measured in PSI, followed by the yield strength in the third column. Coarse pitch threads are preferred and should be used whenever possible, as stated in ASME B1.13M. Its easy to argue that bolts and nuts are just as high-tech today. 0000071592 00000 n
Use the dimensions of your bolt to determine the appropriate size nut. THREAD (BOLT THREADS) A raised, helical rib or ridge around the interior or exterior of a cylindrically shaped object. To install or remove a screw, torque is applied to the fastener head. a17bfG9oz{63N(tUlpL 0YB-r8O#BL %,.3ED$$U= Acceptable for the majority of applications: most common UTS bolt class. 0000051817 00000 n
First, look at the chart and find bolts that have a half-inch diameter. 
Bolt Size Chart: Dimensions, Types and Choosing Tips, Quenched and tempered low carbon boron steel, Quenched and tempered medium carbon alloy steel with additives, Quenched and tempered medium carbon steel or carbon steel with additives, Quenched and tempered medium carbon steel, Quenched and tempered low or medium carbon steel, M shows that the bolt uses metric thread, 5 is the bolt shanks nominal diameter in millimeters, 1.0 refers to the thread pitch in millimeters, 20 is the overall length in millimeters, About 0.35 inches of space to keep the bolt flush to the material, Hot-dipped galvanized steel; suitable for outdoor use, Chrome or nickel-plated steel; can be used outdoors, Bronze or brass; expensive and more common in decorative and art pieces. The bolt body has three dimensions that are essential to any bolt size chart: bolt diameter and thread pitch.
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