G. Mahimtura Marg, 3rd Kumbharwada, Mumbai-400 004 (India) City: Mumbai-400 004, India Phone: +91-22-6659 5285 , 6639 4214 Email: info@raajsagarsteels.com Website: www.raajsagarsteels.com key personnel Contact Person: Mr. Milap Mehta Cell: +91-9869 532 584, Uae , vietnam, qatar, Saudi Arabia, italy, thailand , bangladesh, philippines, Pakistan, Trinidad Tobago, Sri Lanka, Bahrain , sri lanka, kuwait, chennai, bangladesh, Sri Lanka , Saudi Arabia, Bangladesh, singapore, india, philippines , oman, Copyright 2017 Raaj Sagar Steels| All Rights Reserved | Website designed & SEO by, Metric Bolt Conversion | Fastener Conversion Chart, Coarse thread pitch partially threaded (specify grade), Coarse thread pitch fully threaded (specify grade), Fine thread pitch partially threaded (specify grade), Fine thread pitch fully threaded (specify grade), Nylon insert locknuts (specify pitch and class), All metal locknuts (specify pitch and class), Socket head capscrews (normally GR 12.9 and coarse thread), Flat head socket capscrews (normally GR 12.9 and coarse thread), Socket setscrews (normally GR 12.9 and coarse thread), All threaded rod (normally 1 meter lengths, specify grade and pitch), Fastener Chart | Metric Bolt Conversion | Common DIN Numbers for Metric Fasteners | Diameter/Decimal/Metric Chart for Small Diameter Fasteners. When you fasten a bolt into a threaded hole, it holds the materials like a clamp, which prevents any sliding. Junying Metal Manufacturing has developed high-level manufacturing technique in Bolt size is measured across the head of hex and square bolts, from flat side to flat side, just like Standard bolts. Bolts are a type of essential fastener that often assembled with nuts. Length is measured from under the head to the end of the bolt Note: Head sizes may dier from what is shown due to dierences between metric standards Length 16mm 12mm 8mm 7mm 6mm 5mm 4mm 3mm 10mm 14mm Coarse thread . The defined diameter of metric bolts is actually slightly larger than the actual diameter. Theyre commonly used in automotive applications and construction. bolts and 9/16 in. However, it would take a longer time to remove or install. These standards are very strict. 1. Metric bolts have an M stamped on the bolt head followed by a value. Metric & standard bolt screw sizes are determined by length and thread count. We use the M2 screw in small items, such as electrical equipment, cameras, and mobile phones. Youll notice that they all start with an M followed by a number. On the other hand, bolt torque size charts have many variables and different measurements for each bolt grade/class. It specifies the dimensions and tolerances for both metric and imperial bolt head sizes, as well as the corresponding wrench sizes and other details. The ridge surrounding their heads also makes them easy to be identified. Regardless of which method you use, its important to be precise and take multiple measurements to ensure that you get an accurate reading of the bolt head size. What about using a metric bolt size chart? A bolt gauge is divided into standard and metric sections. Sometimes, the pitch is omitted in the abbreviated format, such as M8-20, this means the bolt has a coarse thread. We often use it with softer materials, such as drywall or wood. Whether youre a DIY enthusiast, an engineering student, or an experienced machinist, youre probably aware of how much more sturdy your project can be with the right bolts. The has a cylindrical, raised, hex-socket head, while the latter is headless. These selected sizes are recommended also for general engineering use. 676 $8499 $6.49 delivery Feb 1 - 3 Nut & Bolt Thread Checker (Complete SAE/Inch and Metric Set) - 26 Male/Female Gauges - 14 Inch & 12 Metric - Quickly Checking Nuts and Bolts Inch or Metric and Verifying The Size and Thread Pitch 83 $1999 Bolt head size charts are used as a reference guide to help users select the appropriate size of bolt head for a given application. However, metric bolt head size is measured in millimeters. The imperial system uses inches when getting the length from the tip to where the head rests and the diameter. The M8 screw size has a diameter of 5/32 inches. 3. Now that weve covered all the technical aspects of a bolt size chart, lets look at an example to cement this information. If you are working with steel construction fasteners you can select either EN 14399-3 for HR fasteners or EN 14399-4 for HV fasteners. A #1 gauge is 5/64 inch, and a #2 gauge is 3/32 inch. The M4 comes in several lengths but shares the same diameter of 4mm. Metric nut comparison. They are still unique fasteners in terms of application. 8 causes & fixes, Best Portable Air Conditioner Without Hose: Ventless Exhaust Options, What are the dimensions of 70 & 75-inch TVs, 26 Things to Know About Powder Coating: What it is, Colors, How to. Depending on the application, they come in different forms and sizes. 1996-2023, Amazon.com, Inc. or its affiliates, YEEZET 652PCS Grade 8.8 M4 M5 M6 Heavy Duty Bolts and Nuts Assortment Kit Includes 13 Most Common Sizes, YEEZET 163 Set M4 M5 M6 Heavy Duty Bolts and Nuts Assortment Kit Alloy Steel Grade 8.8 Includes 13 Most Common Sizes, YEEZET 224PCS Grade 8.8 M6 M8 M10 Heavy Duty Bolts and Nuts Assortment Kit Includes 8 Most Common Sizes, Nut and Bolt Thread Checker (Inch & Metric) - 26 Male/Female Thread Identifier Gauges - 14 Inch & 12 Metric Sizes, SST Identibolt Bolt and Nut Identifier Gauge, Nut Bolt & Screw - Thread Gauge. Individual sizes should be checked before specifying any . Take the length of a flat head from the tip to the top of the head. 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 the most accurate length, measure using millimeters from where the screw head sits to the tip. It depends on where the head would sit on the surface. For example, in M6-1.0*20, the "M" means the Metric thread designation, the digit 8 refers to the Nominal diameter (in millimeters), 1.0 refers to the pitch, and 20 refers to the length. This tells you its a metric bolt.Although Metric bolts are measured in millimeters (mm) the M value is a measurement size, not the actual size of the bolt in millimeters. Try Fastener Dimension Guide now. To use these tools, follow the same basic steps as with a regular caliper or micrometer, but be sure to read the digital display carefully to get an accurate measurement. One millimeter is the equivalent of 3/64 of an inch, so you can get pretty exact! Ones with a pan, round, or truss head should be measured from the bottom of the head to the tip. Use millimeters to measure from one side of a thread to the other. But for flat head bolts, the length includes the height of the bolt head and for dome head bolts the length is measured from the highest point on the curved head. Sizing ranges from " up 1.5". The M10 screw has the widest diameter among these six kinds. Based on the results, the metric bolt size chart shows that you can fit an M14 bolt into the 13mm hole. 12 tips to prevent Denver & Colorado Springs altitude sickness, Why are my car and engine leaking oil? For example, 4.0 means the screw has a diameter of 4 millimeters (mm). That said, its common to see abbreviated metric bolt formats, such as M14-50. We refer to metric bolts using M sizes followed by the diameter, thread pitch, and length. Just invest little mature to right to use this on- It is recorded in a decimal point of an mm. US Bolts - Tensile Strength and Proof Loads - Tensile strength and proof loads SAE bolts. ISO metric screw thread: The ISO metric screw thread is a standardized screw thread system that is widely used around the world. Below is a table common fastener sizes and lengths and their US (Inch) decimal and closest fraction equivalent. Whatever the case may be, our wrench conversion chart will give you the best-fitting standard or metric wrench for a given bolt size. These grade marks are given depending on how many pounds per square inch (PSI) the bolt can hold. What is the significance of knowing these things if you can walk into the hardware store and ask the sales clerk for assistance? Screws are very versatile, making them a popular choice among people. It can save you from buying the wrong type, leading to unnecessary expenses and wasted time and effort. 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. Here is an example of how metric sizing: M10-1.0 x 20 Taking a closer l A bolt size chart describes its size based on its proportions. 5/8. The bolt head size chart below can help. For example, in M8-1.0*20, the "M" means the Metric thread designation, the digit 8 refers to the Nominal diameter (in millimeters), 1.0 refers to the pitch, and 20 refers to the length. The answer to this question depends on what the bolts will be used on. You can also screw bolts on two different materials, such as fastening wood to metal. This kind of bolts was used in a carriage which was the basic transportation during inactive times. Several companies indicate the metric and imperial size on the packaging, which is helpful to most consumers. It doesnt matter if youre working outside or on furniture. If the bolt body is the same for all bolt types, then the head is the complete opposite. 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. The popular use of flange bolts including car exhaust, Plumbing, electronic devices, and hard-to-reach applications. The Fastener Dimension Guide allows you to select between the following ISO standards: ISO4014 (DIN 931), ISO4017 (DIN 933), ISO4032 (DIN 970) and ISO4762 (DIN 912). Take, for example, eye bolt size charts. The diameter of a bolt is the Shank diameter, expressed in millimetres for Metric bolts. So the systems are opposite in a way: The higher the TPI in a standard bolt, the finer the threads because there's more squeezed into a set space. Any bolt can be divided into two main parts: the body and the head. TPI stands for Threads Per Inch, which means the total number of threads per inch measured along the length of a fastener. Bolt diameter is typically separated into three categories: Major diameter: The largest and most outer diameter of a bolt's shank. You can screw bolts on anything from drywall, metal, wood, to steel. Brass, nylon, stainless steel, steel, aluminum, and titanium are a few of the materials used in fabricating this type. It consists of a series of holes of different sizes, and you simply place the bolt head in the hole that fits it best. Metric Imperial; Millimetres (mm) You can use it in metal and wood. It comes in several sizes, which you can find in the packaging. FASTENERS 101 Fastener Reference Tables Conversions, Hardness, Thread Pitch, Tensile Strength The tables below are provided as a general guide to help you better understand metric and imperial measurements. Lay-over charts for quickly identifying diameter, thread count and other US fastener dimensions. There are two different methods of sizing wrenches - the standard method (SAE) and the metric sizing. Width of nut across flats Hex head ones are an exception to this rule, which means you need to measure from the bottom of the head. They are made of low to medium grade carbon steel, the head has no markings. Ignition Coil Resistance Chart For 2-Stroke and 4-Stroke Small Engines. Anchor bolts come in different types based on the installation method. To measure screw size, we take its diameter. Use a digital caliper or micrometer: Digital calipers and micrometers are more precise measuring instruments that can give you an even more accurate measurement of bolt head size. They can be helpful in determining the size of a bolt head when only the bolt is available. The size of a metric screw or bolt is specified as diameter, pitch and length, in millimeters (millimeters is abbreviated "mm"). The length of the bolt is also expressed in millimeters and can vary based on the specific needs of the application. Dimensional Standards: IS1364, ISO 4014, ISO 4017, DIN 933, DIN 931, BS 1083, BS 1768, ASME B18.2.1, JIS B1180, DIN 558, ISO 4018, DIN-EN14399-4, DIN 601, ISO 4016, CSN 21301, EU 24016, DIN 7968, DIN7990 Size range: Metric: M2 to M42 Inches: 1/4" to 2" Get Quote Hex Bolt Dimensions The bolt body is the main shank with full or partial threads. When choosing bolts, you will encounter different sizes and types, and this article will help you select the right size for your construction project. The square drive (Robertson drive) and star drive (Torx) have a head that minimizes camming out. Some have an anti-corrosive finish to prevent rust from building up. 1. Sheet metal screws secure sheet metal. Fraction . Then, measure the distance from the center of the bolt head to the farthest point on the bolt head. " Drive. Next, to convert the decimal to millimeters, multiply the decimal by 25.4, which gives you 13.096875mm. Structural wood screws have an unthreaded shaft and coarse threads. Raaj Sagar Steels manufacture and supply a comprehensive range of Slotted Machine Screws, Spanner (Snake Eye) Machine Screws. Now that you know how to take the measurement, the next step is to place the ruler down the axis to get the thread count. Heres a good resource on masonry & brick. Steel is one of the most common materials of bolts, but hex bolts may also be made with aluminum, copper, brass, titanium, or even plastic. Thread Pitch Here are some points to keep in mind when getting the length: Once you have the length, it is time to get the diameter. Lag boltLag bolts, also known as lag screws, one of the toughest fasteners are extremely sturdy. The metric system is based on millimeters, so metric socket sizes are generally sized like 8mm, 10mm, 12mm, and so on. For nuts the size dimensions used are simply diameter and pitch. Gauge = (Head diameter in sixteenths of an inch X 2) 2. Unified Thread Standard (UTS): The Unified Thread Standard is a standard for screw threads that is used in the United States and Canada. Pitch diameter: The diameter where the thread thickness = the space between threads. Length: for socket head, pan head, button head, and hex head bolts, the length measurement from the chamfered edge to the undercut of the head, and the bolt head is not included. US to Metric Conversion Table Print this page . Metric Hex Bolt Dimensions | Atlanta Rod and Manufacturing | Manufacturing of Bolts, Concrete Embeds, Construction Fasteners, and Stainless Steel Bolts - Atlanta Rod and Manufacturing Common metric dimensions for hex bolts from Atlant Rod. Kindly say, the Metric Bolt Size Chart Pdf is universally compatible with any devices to read bolts types and sizes metric imperial bolt dimensions web aug 18 2020 the size of a metric bolt is specified using pitch diameter and length in millimeters for example in m8 1 0 20 the m means the metric thread designation the digit 8 In the metric system, we use pitch instead of thread spacing. Dont choose rain chains before reading this + DIY options. Pitch combinations that seem to be in the middle can simply be described as fine pitch. The bolt head size is often only used to determine the wrench to use when tightening or loosening the bolt. Fine-threaded drywall ones work best with metal studs, while coarse-threaded ones work with wood studs. Deck screws are for fencing and decks, but they can also be used for similar outdoor projects. Nuts and bolts are produced in standard sizes and dimensions. Some are a combination that works for either type. Youll find two extra columns: one for Outside Eye Diameter and one for Inside Eye Diameter. Using a ruler or measuring tape, get the measurement from one side of a thread to the other to get the diameter. IMPORTANT SCREWS LINKS :Pdf:Dimensions:Faq. A printable paper version of our popular Thread Gauges. No inquiry is too large or too small, we specialize in locating hard to find items. The SAE to metric conversion size chart below is the easiest way to convert standard & inch measurements to mm & cm. Use the dimensions of your bolt to determine the appropriate size nut. How do you tell if a bolt or nut is standard or metric, and what size wrench or socket to use? Flange Bolt Dimensions Chart and Stud Size in mm Flange Bolt Dimensions Chart and Stud Size in mm In this article, I have covered Flange Bolt Dimension Chart and Stud Size Dimensions for stud and bolt used in piping. Eyebolt consists of a threaded shank with a ring or loop at one end, often used to attach an eye to a structure, through which ropes, cables, or shackles can be secured. Our Gujarat Division provide total Fasteners Solutions for various projects in India & overseas so far we have supplied Square Drive Pan Head Machine Screws, SS Machine Screw to more than 30 countries like UK, Ireland, Vietnam, Philippines, South Africa, Australia, Kenya, Nigeria, Iran, Russia, Japan, Canada and many more European & African Countries , We have wide range of manufacturing capabilities and due to our proven track record & only 1% rejection rate became Raaj Sagar Steels an ideal choice for major EPC Contractors across the globe for their Steel Fasteners requirements. 7mm falls in between and converts to a 1/4 or 9/32 standard. On the other hand, it still uses millimeters to measure length. Properly sizing a replacement bolt can be challenging. The charts below show which are interchangeable between metric and standard, aka imperial or. It was introduced in the British Weights and Measures Act of 1824. The maximum tensile strength is 500MPa and the maximum yield strength is 210 MPa. ASME B18.2.1: The ASME B18.2.1 standard is a specification for hex bolts, hex cap screws, and other types of bolts. Consider this size M8-1.0 x 20 Here's what the description means Wood and plastic ones are also good options. Bolts can me specified in metric using millimeters, but the standard, internationally-recognized descriptions of bolt sizes are in inches. The chart below shows metric bolt conversions and DIN numbers for fasteners. In the standard chart, a bolts tensile strength is represented as grade radial marks on top of the bolts head. The metric system was based on the meter, a system of measurement whose origin was in France in the 1970s. hbspt.cta._relativeUrls=true;hbspt.cta.load(755974, '39b18361-88bb-44bf-ab1f-a16e8df62b5f', {"useNewLoader":"true","region":"na1"}); NOMINAL DIAMETER (NOMINAL BOLT DIAMETER) The diameter equal to the external diameter of the threads or the overall diameter of the part. Class Grade Sizes (mm) Mini. (Nominal diameter is more of a label than a size. Shoulder bolts usually used to attach pulleys, moving engine parts, gears, rolling wheels, and stripper plates. Certain sizes accept a varying number of sockets that can be either metric and SAE. When it comes to choosing the right socket, make sure you get the size that suits your drive size. Whether youre working on a DIY project or a construction job, what you need is a proper and basic understanding of how to use a chart for bolt sizes. Download the Imperial Clearance Hole Chart to save the chart as a PDF - useful to print out to have next to your tools.. Want to determine what size clearance hole for Metric, for example, a 10.5 mm clearance hole is required for an M10 close fit, then check out our chart here. Metric US Decimal Closest* A concrete screw is what you need for fastening concrete. Metric . The standard metric bolt diameters are specified in the standard ISO 898-1 Tables 4 and 5. For example, an M10x1.5 (coarse) thread has a 1.5mm pitch, while an M10x1.25 (fine) thread has a 1.25mm pitch. Every metric bolt is assigned a class number in terms of megapascals (MPa). Metric Bolts and Nuts Grade 8 Metric Bolts Stainless Steel Metric Bolts Class 10 Metric Bolt Class 8.8 Metric Bolt M5 Metric Bolt Hex Head Metric Bolt Dimensions : US Hex Bolts. US Hex Bolts - Metric - ANSI/ASME B18.2.3M Dimensions of Hex Bolts - Metric units. Bolt heads have three essential dimensions: size across the flats, across the corners, and head height. You can use a multi-material one in several materials, such as drywall or sheet metal. But neither the external threads of the bolt nor the internal threads of the nut are exactly .500 in diameter. Now that we have discussed some of the basics, it is time to guide you through what you need to know. It is absolutely necessary to make sure you use the SAME thread pitch when replacing a bolt. The diameter of an M6 screw is 6mm. We also have a resource on Phillips head options. Download the Metric Clearance Hole Chart to save the chart as a PDF - useful to print out to have next to your tools. Most retailers do not indicate both system sizes on the product page. Terms & Conditions-FAQ-About Us-Privacy policy - Facebook - Twitter, Metric & Standard Bolt & Screw Size Chart: M2, M4, M5, M6, M8, M10, gauge number or fraction of an inch represents the diameter, gauge number represents the fraction of an inch, 15 Warning symptoms of mold toxicity & sickness (What to do & 10+ signs not to ignore), 50-to-1 fuel mix chart gallons: Best 2-cycle oil mix, Best fish finders under $300, $500, & $1,000 for your boat. Instead of using gauges in expressing diameter, the metric system uses millimeters. It has a diameter of 10mm and comes in several lengths. Use a ruler or a measuring tape to get the most accurate measurement. Regular lawn mower maintenance promotes lawn health. SAE J429: The SAE J429 standard is a specification for bolts, screws, and studs that are used in automotive and related industries. Thread sizes for coarse and fine pitch thread were created using the standard sizes from ASME B1.13M. Ones with a flat or oval head should be measured from the top to the tip. Flanges - ASME/ANSI B16.5 Flanges and Bolt Dimensions - Class 150 to 2500 - Diameters and bolt circles for standard ASME B16.5 flanges - 1/4 to 24 inches . Body Diameter - There may be a reasonable swell or fin under the head or die seam on the body not to exceed the basic bolt diameter by the following: 0.030" for sizes up to 1/2" 0.050" for sizes 5/8" and 3/4" 0.060" for sizes over 3/4" to 1-1/4" 0.090" for sizes over 1-1/4" to 2" 0.120" for sizes over 2" to 3" 0.190" for sizes over 3" US and Metric Fasteners - Thread Sizes - Printable fastener chart. Hexagon Nut and Bolt Sizes. The resulting number will be the size of the wrench you need to adjust the bolt properly. Should you decide to go with the latter, it is less time-consuming to drill all holes first before installing the screws. Other types are used for drywall and concrete. Check out thestandard bolts size chart in metric or imperial below. . Composite deck ones have fine threads and a small head. Screw heads rest differently on surfaces. It evolved through a series of amendments in the said act. It can even cause a failed project. U-bolts can be made from various materials, durable and non-corrosive metal is the first choice, such as 316 stainless steel, 304 stainless steel, and plain carbon steel. Metric bolts, however, have super fine thread pitchgranted that only bolts M10 and M12 have super fine thread pitch options. Metric Fasteners use a thread Pitch. Do keep note drywall ones cannot support tile and cement board. Raaj Sagar Steels is an international supplier of Slotted Machine Screws, Spanner (Snake Eye) Machine Screws, Stainless Steel Lag Screws, Torx Machine Screws, Trim Head Hex Cap Screws, Stainless Steel Wood Screw, One Way Machine Screws.The Screws manufactured in Stainless Steel and Duplex steel, we also manufacture Phillips Machine Screws at our other factory in Vapi, Gujarat. Remember that the standard bolt size equivalent is an approximation, not a direct equivalence. So, lets look at some bolt proportions and dimensions. The second chart below is a US fraction to metric mm for the more common sizes up to 4". Metric Screw Sizes and Screw Dimension Charts, items distributed by Best Materials Created Date: 2/16/2011 5:21:06 PM . But here's the tricky part: In the metric screw chart, the number of threads per inch isn't calculated. No inquiry is too large or too small, we specialize in locating hard to find items. Just make sure youve got a high bolt grade or class. Here are some of the most common ones. Similar to the size charts, the tensile strength charts are predominantly the same, but with different measurement units. Using a bolt with the right sizes is vital for jobs in various machinery and equipment. Its point will not be chamfered or rounded. For any other types that are not countersunk, measure from the flat underside to the tip. A ruler is all you need to determine thread count and size. However, there is no correlation or scientific explanation here. The size of a metric bolt is specified using pitch, diameter, and length in millimeters. J-boltJ-bolts are J-shaped fasteners with threads at the non-curved section, another section is designed to a hook for support. Why? An M4 screw is slightly larger than an M2. The latter is also commonly referred to as threads per inch (TPI) or thread pitch. The head diameter of elevator bolts is larger than other types, which can prevent the bolt from going through soft conveyor material. Take the diameter of the bolt, and multiply by 1.5. ISO Metric Wrench Size Table Chart Metric wrench size for Metric Hex Head Bolts. The threads provide a sturdy grip, allowing them to meet the requirements of any project. It has three vital dimensions: size across its flats, size across, its corners, and the heads height. Some require you to pre-drill, while others are self-tapping. When the thread pitch is dropped from the specification, it means that the bolt is coarse-threaded. You can even use it on concrete. Carriage bolts are usually used to fasten metal to metal or metal to wood. 1/4 Drive. However, heres a quick overview from the chart: Heres the standard & metric screw size chart you need to help you find the right products at the shop! The gauge and length determine the size. Is it hard to breathe in Colorado? Lay it down on a flat surface again. In the metric chart, tensile strength is written as class numbers on a bolts head. When taking the length of a screw, we use meters. The greater the pitch on metric fasteners, the more distance between threads. online proclamation Standard Metric Hex Bolt Sizes And Thread Pitches can be one of the options to accompany you in the manner of having supplementary time. Determine the maximum torque according to bolt (nut) size and grade. When you install it, the head of the elevator bolt should lie against the inside surface of the elevator belt with the nuts and washers on the inside of the elevator bucket. Again, you find that bolts 1/2 and 9/16 have a head height of around 0.35 inches, with a minimum of 0.302 inches and a maximum of 0.371 inches. It has a hex head, so you need a socket and ratchet or a wrench to secure it in place. Choose from our selection of screw size charts, including screw size identifiers, screw, bolt, and nut size identifiers, and more. For accuracy, count the first thread as zero. The measurement refers to the size of the square used to attach the to socket to a wrench or a ratchet. On the other hand, wood deck ones have an unthreaded shank and a coarse-threaded portion. production fields of machining. The good news is that you can now confidently say that you know all about bolts and bolt size charts. If you do see what you are looking, we would love to assist you and give you a quote today! Now let's break it down: 'M' shows that the bolt uses metric thread '5' is the bolt shank's nominal diameter in millimeters