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.

Add a header to begin generating the table of contents

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.

Thread Pitch (P): The distance between adjacent threads along the fastener's axis is the thread pitch.
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.

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.
Thread angle: The ISO metric thread standard has a thread angle of 60-degrees which is a common system in many threads.
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.

Don't forget to share this post!

CONTACT US

Tell us your raw material and working details to get quotations within 24 hours.

WhatsApp Us: +86 159 27 555863

Want the best price & newest metal working machinery buying guide,tips and trends sent straightly to your box?Sign up for Armpro's monthly newsletter,we're free for your consultation and Offer you the most suitable working solutions!

The Buyer's Guide

Tell us your material or budget,we'll reply you ASAP within 24 hours

ISO Metric Thread Size Chart

1. What is the ISO Metric Thread parameter?

2. What is the ISO Metric Thread size chart

Metric Threads - Coarser Threads

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

4. How to make an ISO Metric Thread?

5. Conclusion

Don't forget to share this post!

Related Products

TR28-650 Hydraulic thread rolling machine

TR28-250P Hydraulic thread rolling machine Pro-version

TR28-250B Hydraulic thread rolling machine

TR28-6.3 Hydraulic Three-die Thread rolling machine

TR28-250 Hydraulic thread rolling machine

TR28-500 Hydraulic thread rolling machine

Thread Rolling Flat Die

Cylindrical Thread Rolling Dies

CONTACT US

The Buyer's Guide

Most Popular

ABOUT ARMPRO

WhatsApp

Email Armpro

Call Armpro