ISO Metric Thread Size Chart

  • ISO Metric Threads are the most commonly used type of screw thread that has general-purpose applications. The international standard ISO 68-1 is used to define the design principles of ISO general-purpose metric screw threads which are also known as M threads.
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    1. What is the ISO Metric Thread parameter?

    ISO metric threads are a standardized measuring system used to measure and specify threaded fasteners like bolts and nuts. There are several parameters that can be found in the ISO metric threads.

    These parameters ensure that high compatibility and interchangeability of threaded components are achieved by providing a comprehensive specification for metric threads.

     

    1. Thread Pitch (P): The distance between adjacent threads along the fastener's axis is the thread pitch.
    2. Major Diameter (D): The outer diameter of the threaded part of the fastener.
    • Minor diameter (d): The diameter at the bottom of the thread's grooves is the minor diameter.
    1. Pitch diameter (d2): It is a theoretical diameter which lies between the major and minor diameters. This parameter is used for various calculations and imperative in ensuring the proper engagement of the thread.
    2. Thread angle: The ISO metric thread standard has a thread angle of 60-degrees which is a common system in many threads.
    3. Thread tolerance: ISO metric threads possess predefined tolerances for major and minor diameters and the diameter of the pitch. These tolerances enable to make sure that threads may fit together correctly even if they are from different manufacturers.
    • Thread series: ISO metric threads are produced in several series which includes the coarse thread series that is designated as 'M' and the fine thread series that is designated as 'MF'.

     

    These parameters are considered essential in various industries where threaded fasteners have wide applications like automotive to construction.

    2. What is the ISO Metric Thread size chart

    The ISO metric thread size chart is a standard table that provides a standardized reference for the specification of metric threads, including the major diameter (D), pitch (P), and thread designation. Below is a version of the standard size chart for ISO metric threads.

    The above chart shows the standard specifications for ISO metric threads. include Coarser and fine threads, Based on your requirements you can go through the size chart to choose the most suitable ISO metric thread to suit your needs and requirements.

    Metric Threads - Coarser Threads

     

    Thread Major Diameter

    (d=D)

    		 Pitch

    (p)

    		 Root

    Radius

    (r)

    		 Pitch

    Diameter

    (d2=D2)

    		 Minor

    Diameter

    Male Thread

    (d3)

    		 Minor

    Diameter

    Female Thread

    (D1)

    		 Thread Height

    Male Thread

    (h3)

    		 Thread Height

    Female Thread

    (H1)

    		 Tap Drill Diameter
    M1 1 0.25 0.036 0.838 0.693 0.729 0.153 0.135 0.75
    M1.1 1.1 0.25 0.036 0.938 0.793 0.829 0.153 0.135 0.85
    M1.2 1.2 0.25 0.036 1.038 0.893 0.929 0.153 0.135 0.95
    M1.4 1.4 0.3 0.043 1.205 1.032 1.075 0.184 0.162 1.1
    M1.6 1.6 0.35 0.051 1.373 1.171 1.221 0.215 0.189 1.25
    M1.8 1.8 0.35 0.051 1.573 1.371 1.421 0.215 0.189 1.45
    M2 2 0.4 0.058 1.74 1.509 1.567 0.245 0.217 1.6
    M2.2 2.2 0.45 0.065 1.908 1.648 1.713 0.276 0.244 1.75
    M2.5 2.5 0.45 0.065 2.208 1.948 2.013 0.276 0.244 2.05
    M3 3 0.5 0.072 2.675 2.387 2.459 0.307 0.271 2.5
    M3.5 3.5 0.6 0.087 3.11 2.764 2.85 0.368 0.325 2.9
    M4 4 0.7 0.101 3.545 3.141 3.242 0.429 0.379 3.3
    M4.5 4.5 0.75 0.108 4.013 3.58 3.688 0.46 0.406 3.8
    M5 5 0.8 0.115 4.48 4.019 4.134 0.491 0.433 4.2
    M6 6 1 0.144 5.35 4.773 4.917 0.613 0.541 5
    M7 7 1 0.144 6.35 5.773 5.917 0.613 0.541 6
    M8 8 1.25 0.18 7.188 6.466 6.647 0.767 0.677 6.8
    M9 9 1.25 0.18 8.188 7.466 7.647 0.767 0.677 7.8
    M10 10 1.5 0.217 9.026 8.16 8.376 0.92 0.812 8.5
    M11 11 1.5 0.217 10.026 9.16 9.376 0.92 0.812 9.5
    M12 12 1.75 0.253 10.863 9.853 10.106 1.074 0.947 10.2
    M14 14 2 0.289 12.701 11.564 11.835 1.227 1.083 12
    M16 16 2 0.289 14.701 13.546 13.835 1.227 1.083 14
    M18 18 2.5 0.361 16.376 14.933 15.394 1.534 1.353 15.5
    M20 20 2.5 0.361 18.376 16.933 17.294 1.534 1.353 17.5
    M22 22 2.5 0.361 20.376 18.933 19.294 1.534 1.353 19.5
    M24 24 3 0.433 22.051 20.319 20.752 1.84 1.624 21
    M27 27 3 0.433 25.051 23.319 23.752 1.84 1.624 24
    M30 30 3.5 0.505 27.727 25.706 26.211 2.147 1.894 26.5
    M33 33 3.5 0.505 30.727 28.706 29.211 2.147 1.894 29.5
    M36 36 4 0.577 33.402 31.093 31.67 2.454 2.165 32
    M39 39 4 0.577 36.402 34.093 34.67 2.454 2.165 35
    M42 42 4.5 0.65 39.077 36.479 37.129 2.76 2.436 37.5
    M45 45 4.5 0.65 42.077 39.479 40.129 2.76 2.436 40.5
    M48 48 5 0.722 44.752 41.866 42.857 3.067 2.706 43
    M52 52 5 0.722 48.752 45.866 46.857 3.067 2.706 47
    M56 56 5.5 0.794 52.428 49.252 50.046 3.374 2.977 50.5
    M60 60 5.5 0.794 56.428 53.252 54.046 3.374 2.977 54.5
    M64 64 6 0.866 60.103 56.639 57.505 3.681 3.248 58
    M68 68 6 0.866 64.103 60.639 61.505 3.681 3.248 62

    Metric Threads - Coarser Threads

    Thread

    Size

    		 Major

    Diameter

    d=D

    		 Pitch

    p

    		 Root

    Radius

    r

    		 Pitch

    Diameter

    d2=D2

    		 Minor

    Diameter

    Male

    Thread

    d3

    		 Minor

    Diameter

    Female

    Thread

    D1

    		 Thread

    Height

    Male

    Thread

    h3

    		 Thread

    Height

    Female

    Thread

    H1

    		 Tap

    Drill

    Diameter
    M1.0 x 0.2 1 0.2 0.029 0.87 0.755 0.783 0.123 0.108 0.8
    M1.1 x 0.2 1.1 0.2 0.029 0.97 0.855 0.883 0.123 0.108 0.9
    M1.2 x 0.2 1.2 0.2 0.029 1.07 0.955 0.983 0.123 0.108 1
    M1.4 x 0.2 1.4 0.2 0.029 1.27 1.155 1.183 0.123 0.108 1.2
    M1.6 x 0.2 1.6 0.2 0.029 1.47 1.355 1.383 0.123 0.108 1.4
    M1.8 x 0.2 1.8 0.2 0.029 1.67 1.555 1.583 0.123 0.108 1.6
    M2 x 0.25 2 0.25 0.036 1.838 1.693 1.729 0.153 0.135 1.75
    M2.2 x 0.25 2.2 0.25 0.036 2.038 1.893 1.929 0.153 0.135 1.95
    M2.5 x 0.35 2.5 0.35 0.051 2.273 2.071 2.121 0.215 0.189 2.1
    M3 x 0.35 3 0.35 0.051 2.773 2.571 2.621 0.215 0.189 2.6
    M3.5 x 0.35 3.5 0.35 0.051 3.273 3.071 3.121 0.215 0.189 3.1
    M4 x 0.5 4 0.5 0.072 3.675 3.387 3.459 0.307 0.271 3.5
    M4.5 x 0.5 4.5 0.5 0.072 4.175 3.887 3.959 0.307 0.271 4
    M5 x 0.5 5 0.5 0.072 4.675 4.387 4.459 0.307 0.271 4.5
    M5.5 x 0.5 5.5 0.5 0.072 5.175 4.887 4.959 0.307 0.271 5
    M6 x 0.75 6 0.75 0.108 5.513 5.08 5.188 0.46 0.406 5.2
    M7 x 0.75 7 0.75 0.108 6.513 6.08 6.188 0.46 0.406 6.2
    M8 x 0.75 8 0.75 0.108 7.513 7.08 7.188 0.46 0.406 7.2
    M8 x 1.0 8 1 0.144 7.35 6.773 6.917 0.613 0.541 7
    M9 x 0.75 9 0.75 0.108 8.513 8.08 8.188 0.46 0.406 8.2
    M9 x 1 9 1 0.144 8.35 7.773 7.917 0.613 0.541 8
    M10 x 0.75 10 0.75 0.108 9.513 9.08 9.188 0.46 0.406 9.2
    M10 x 1 10 1 0.144 9.35 8.773 8.917 0.613 0.541 9
    M10 x 1.25 10 1.25 0.18 9.188 8.466 8.647 0.767 0.677 8.8
    M11 x 0.75 11 0.75 0.108 10.513 10.08 10.188 0.46 0.406 10.2
    M11 x 1 11 1 0.144 10.35 9.773 9.917 0.613 0.541 10
    M12 x 1 12 1 0.144 11.35 10.773 10.917 0.613 0.541 11
    M12 x 1.25 12 1.25 0.18 11.188 10.466 10.647 0.767 0.677 10.8
    M12 x 1.5 12 1.5 0.217 11.026 10.16 10.376 0.92 0.812 10.5
    M14 x 1 14 1 0.144 13.35 12.773 12.917 0.613 0.541 13
    M14 x 1.25 14 1.25 0.18 13.188 12.466 12.647 0.767 0.677 12.8
    M14 x 1.5 14 1.5 0.217 13.026 12.16 12.376 0.92 0.812 12.5
    M15 x 1 15 1 0.144 14.35 13.773 13.917 0.613 0.541 14
    M15 x 1.5 15 1.5 0.217 14.026 13.16 13.376 0.92 0.812 13.5
    M16 x 1 16 1 0.144 15.35 14.773 14.917 0.613 0.541 15
    M16 x 1.5 16 1.5 0.217 15.026 14.16 14.376 0.92 0.812 14.5
    M17 x 1 17 1 0.144 16.35 15.733 15.917 0.613 0.541 16
    M17 x 1.5 17 1.5 0.217 16.026 15.16 15.376 0.92 0.812 15.5
    M18 x 1 18 1 0.144 17.35 16.773 16.917 0.613 0.541 17
    M18 x 1.5 18 1.5 0.217 17.026 16.16 16.376 0.92 0.812 16.5
    M18 x 2 18 2 0.289 16.701 15.546 15.835 1.227 1.083 16
    M20 x 1.0 20 1 0.144 19.35 18.773 18.917 0.613 0.541 19
    M20 x 1.5 20 1.5 0.217 19.026 18.16 18.376 0.92 0.812 18.5
    M20 x 2.0 20 2 0.289 18.701 17.546 17.835 1.227 1.083 18
    M22 x 1.0 22 1 0.144 21.35 20.773 20.917 0.613 0.541 21
    M22 x 1.5 22 1.5 0.217 21.026 20.16 20.376 0.92 0.812 20.5
    M22 x 2.0 22 2 0.289 20.701 19.546 19.835 1.227 1.083 20
    M24 x 1.0 24 1 0.144 23.35 22.773 22.917 0.613 0.541 23
    M24 x 1.5 24 1.5 0.217 23.026 22.16 22.376 0.92 0.812 22.5

    3. What is the application of the ISO Metric Thread?

    ISO Metric threads have a large range of applications across various industries around the world. This is due to their standardized design and size. Some such industries where ISO metric threads are used are given below.

     

    1. Manufacturing and engineering industry
    ISO metric threads are very often used in the manufacturing and engineering industry for the manufacturing of machinery, components, and equipment. They are used mostly as they provide a standardized way to connect and secure parts of the machinery, thereby ensuring interchangeability and compatibility.
    2. Construction industry
    ISO metric threads are used in the construction industry to assemble structural components, securing the scaffolding, and fastening various materials of buildings.
    3. Aerospace industry
    Aerospace engineering highly relies on precision. metric threads are considered very suitable for assembling aircraft components, securing critical systems and ensuring the integrity of the aircraft considering its structure.
    4. Automotive industry
    ISO metric threads are very commonly used in automobiles. They are used to secure various components including engine parts, fasteners and chassis components.
    5. Electronics industry
    Metric threads are used in the electronics industry to secure devices, enclosures and assemblies thereby ensuring proper alignment and electrical connections.
    6. Medical devices manufacturing industry
    ISO metric threads are used in the manufacturing of medical devices. Metric threads ensure the proper assembly and function of various instruments and equipment.
    7. Plumbing and pipe fittings manufacturing industry
    ISO metric threads are used in the manufacturing of plumbing and fluid systems in order to connect pipes, valves, and fittings. This also ensures a leak-tight seal.
    8. Fasteners manufacturing industry
    Metric bolts, screws, and nuts equipped with ISO metric threads are available for general purpose use and are commonly found in almost all hardware stores.
    9. Bicycles and sports equipment
    ISO metric threads are used in the assembly of bicycles, sporting equipment and outdoor gear in order to ensure that the equipment has the highest stability and safety.
    10. Furniture equipment manufacturing industry
    ISO metric threads are used in the assembly of furniture, home appliances, consumer goods and other household products. Using metric threads to manufacture these products makes it easier to assemble and disassemble these products.

    4. How to make an ISO Metric Thread?

    Creating ISO metric threads require high knowledge of precision, especially if the threads are to be used for critical applications. Using the correct tap or die sizes and lubricating the threading tool is very important in order to achieve accurate and well-formed threads. Their specifications must be carefully crafted as they are itself used to give high-precision solutions. ISO metric threads consist of a symmetrical V-shaped thread, where the V has an angle of 60° in the plane of the thread axis. The depth of the thread id about 0.54125 x pitch and the outermost ⅛ and the innermost ¼ of the height are cut off from the profile of the V-shape.

    5. Conclusion

    In conclusion, ISO metric threads serve as the sole language of precision engineering. They provide a standardized system for measuring the thread and specifications. The ability to apply them in a wide range of applications in various industries, from aerospace to construction and electronics.

    The ISO metric threads standard ensures that the products contain compatibility and interchangeability. Moreover, they contribute to the safety, quality and reliability of the products and machinery that are distributed worldwide. The simplicity and the precision of ISO metric threads make it an invaluable tool for engineers, manufacturers, constructors, and designers, as they simplify the complexities of threaded fasteners.

     

    With the advancement and globalization that the industries are undergoing currently, ISO metric threads remain a solid ground for efficient production, maintenance, and repair. Therefore, whether you are planning to build a skyscraper, assemble an engine for the latest model of a car, or even in the middle of the process of designing the latest technological innovation, ISO metric threads will continue to have a vital role in shaping the future of the whole world.

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