metric thread size chartmetric thread size chart

Economics Engineering 0000030459 00000 n Metric Internal Thread Chart Limiting Dimensions for M Profile: Thread . %PDF-1.5 % 1 0 obj For example, in the screw size 10-24, the first digit refers to the thread diameter, the and second digit is threads-per-inch (TPI). Metric fasteners are specified with a thread pitch, instead of a thread count. This is because extra fine threads are more resistant to coming loose from vibrations. 0000018619 00000 n of Threads/Inch BA BSW BSF BSP Major Dia. Electronics Instrumentation The class defines the Deviation (allowance) and tolerance of the thread. The printable fastener tools series also includes general charts and tools for identifying and measuring fasteners, including a ruler and thread gauge. The following table chart are standard metric internal thread sizes M 0.25 - M 8 per. Structural Shapes M10 x 0.75. Welding Stress Calculations endobj 14 0 obj So, your search ends here! In general, smaller fasteners have finer threads, so they have a lower thread pitch. Engineering ToolBox - Resources, Tools and Basic Information for Engineering and Design of Technical Applications! 'RoZW(kN-9:3:WO\&:s4t.uZ$uC:[D,IWW0[VvM^nNJoK5]=\&ZhAwo- The ISO metric screw thread family is a series of general-use, 60 straight threads. The following table chart defines standard metric external thread size M1.6 to M18 per. All units in mm. Vibration Engineering Measure thread spacing. If you don't know the pitch, choose coarse threads; they're the industry standard. These thread sizes and classes represent bolts and screws, as well, as other standard external threads. Since we also talked about imperial screw callouts, let's read this screw thread callout as well: #6 x 1 x 1/2. Cookies are only used in the browser to improve user experience. This means that the external thread must end flat at Dmaj, but can be rounded out below the minor diameter Dmin. In addition to coarse and fine threads, there is another division of extra fine, or superfine threads, with a very fine pitch thread. Strength of Materials Downloads An example of data being processed may be a unique identifier stored in a cookie. Bearing Apps, Specs & Data All units in mm. The M5 screw size has a diameter of 1/8 inch. on a bolt) will pass through easily to create a well-located connection to an internally threaded component (e.g. Flat Plate Stress Calcs TPI is used only with American fasteners. We and our partners use data for Personalised ads and content, ad and content measurement, audience insights and product development. The minor diameter Dmin and effective pitch diameter Dp are derived from the major diameter and pitch as. Engineering Book Store Our smart WIZARD shows you the BEST GRADE by each brand for your application! These thread sizes and classes represent bolts and screws, as well, as other standard internal threads. The ISO metric screw thread is the most commonly used type of general-purpose screw thread worldwide. M6 corresponds to 6 mm). Japan has a JIS metric screw thread standard that largely follows the ISO, but with some differences in pitch and head sizes. In the ISO metric system a decimal point is made with a comma instead of a period. Videos Design Manufacture ISO 965-3: Deviations for constructional screw threads, ISO 965-4: Limits of sizes for hot-dip galvanized external screw threads to mate with internal screw threads tapped with tolerance position H or G after galvanizing, ISO 965-5: Limits of sizes for internal screw threads to mate with hot-dip galvanized external screw threads with maximum size of tolerance position h before galvanizing, This page was last edited on 5 February 2023, at 23:22. The ISO Standardisation Authority defines strict specifications metric threads. 0000019082 00000 n Civil Engineering ISO 262 "ISO general purpose metric screw threads Selected sizes for screws, bolts and nuts", has not been included as a separate clause in this standard as . The terms coarse and fine have (in this context) no relation to the manufacturing quality of the thread. hb```b``b,ka!n`@W2:^5JR;~lu}snKsk~8Uv}XC+: !4%,F8 i V(300aG"YK:pD\c\u %KYI. x[7r;@/,V7k K }A INFf:""_/|e_Q\4lh9\)uxO~~yoo/^~yw{)/??>}{9]/^*_?[0\u$LM|~g5UdMBjq,FOm;9CmBe^bEa) j_WcuSC!ly-_l_|}m>7=MGYk~Nu;{9*GUiX=0MdTuT/]l+EG3]>~}mDFN5A7!?&J^bhn3{s}bjhi%f&1itO5>meKNbN-Fw1u{q!O{|)l/YfO._+.mkx>~w*]lL2:/a>r(`{D#9aMFm[a%HJLJzQ$Fh{kX&'q9Pva^Y$3Ll]IXamEx;Jf#J|, |by6dU\bO:,0TyVQqdb_MnU6'@OFA!Vm8SjqDSFI{.^M``KYyl3A9EJh@2S ! Understanding Inch & Metric Thread Callouts. Thread sizes are not directly interchangeable. For metric screws, this is the length in millimeters between threads. The following table chart defines standard metric external thread size M1.6 to M18 per. Beam Deflections and Stress The M4 screw size has a diameter of 7/64 inches. The clearance drill sizes listed are the most commonly used sizes. Pressure Vessel Welding Stress Calculations This is to ensure compatibility with mating components. These thread sizes and classes represent bolts and screws, as well, as other standard internal threads. For example,M8is a thread with a nominal diameter of 8 mm (0.315). Lubrication Data Apps Feedback Advertising The thread pitch is the distance between threads expressed in millimeters. <>>> [citation needed]. | Difference Between UNF and UNC Thread | CNCLATHING, Guide to Design and Machining Thread: How to Cut an Internal & External Thread? ANSI/ASME B1.13M-1995. A thread's pitch size is the number of threads per inch or the distance between threads on metric thread types. For metric screws, this is the number of millimeters preceded by the letter M This corresponds to the first number of the thread size. endobj 0000023618 00000 n UNEF - Ultra Fine pitch thread. The values are calculated from the definitions of ISO 965-1. * All dimensions are in mm. The third and final number is the screw's length which equals 30 mm. It indicates the diameter of smooth-walled hole that a male thread (e.g. H = P ( 31/2 / 2 ) = 0.866025 P 0000025028 00000 n Friction Formulas Apps <> The choice of the recommended class is made according to two parameters: Type your thread description in the Search Box. Power Transmission Tech. 0 In all other cases, calculations must be made manually according to the below formulas or by our Threading Calculator, * For threads over 1.4 mm and classes 5H & 6h for threads up to and including 1.4 mm. Do not use these values for standard metric external thread design. <> Applications and Design Threads produced to this standard are interchangeable with threads produced to the metric standard ANSI/ASME B1.13M Metric Screw Threads: M Profile. 0000002104 00000 n Learn how and when to remove this template message, International Organization for Standardization, Preferred metric sizes ISO_261 and 262 fastener diameters, Diagrams and tables of many screwthread series. Manage Settings Hardware, Imperial, Inch Metric thread sizes are specified by diameter and pitch, which is the space between 0000007146 00000 n The metric thread sizes are generally expressed as M2 0.25, the thread diameter is 2mm and pitch is 0.25mm. If the pitch is the normally used "coarse" pitch listed in ISO 261 or ISO 262, it can be omitted (e.g. For inches, this is done endobj 15 0 obj Conversely, in an internal (female) thread (e.g. In tolerance class designation, the pitch diameter tolerance is followed by major diameter tolerance. in a nut), the major and minor diameters are minimum dimensions; therefore the thread profile must end flat at Dmin but may be rounded out beyond Dmaj. Class - 6g for external threads and 6H for internal threads. The above formulas provide the exact results. ANSI/ASME B1.13M-1995. AddThis use cookies for handling links to social media. Please read Google Privacy & Terms for more information about how you can control adserving and the information collected. All units in mm. In general, smaller fasteners have finer threads, so the thread count is higher. In addition, one or two smaller fine pitches are defined, for use in applications where the height of the normal coarse pitch would be unsuitable (e.g. The pitch varies from coarse to extra fine with up to 5 different pitches for some dimensions. of 12 mm and a pitch of 1-1/2 mm. ISO 68:1973 ISO general purpose screw threads - Basic profile, ISO 261:1973 ISO general purpose metric screw threads - General plan, ISO 262:1973 ISO general purpose metric screw threads - Selected sizes for screws, bolts and nuts, ISO 724:1993 ISO general-purpose metric screw threads - Basic dimensions, ISO 965-1:1980 ISO general purpose metric screw threads - Tolerances - Part 1: Principles and basic data, ISO 965-2:1980 ISO general purpose metric screw threads - Tolerances - Part 2: Limits of sizes for general purpose bolt and nut threads - Medium quality, ISO 965-3:1980 ISO general purpose metric screw threads - Tolerances - Part 3: Deviations for constructional threads, ISO 1502:1996 ISO general-purpose metric screw threads - Gauges and gauging. Tap size: Basic major dia (mm) Basic major dia (inch) mm per thread: Drill size (mm) Drill size (inch) The values listed in the chart above are the recommended values for a class 2 thread fit. Note that the ISO 724 standard specifies threads up to M 300. (Valid above 1.6 mm / 0.063) Direction - Right-hand thread. <> Gears Design Engineering 15.0. 0000010391 00000 n <>/XObject<>/ProcSet[/PDF/Text/ImageB/ImageC/ImageI] >>/Annots[ 11 0 R 12 0 R 15 0 R 24 0 R] /MediaBox[ 0 0 612 792] /Contents 4 0 R/StructParents 0>> <>/OutputIntents[<>] /Metadata 1646 0 R/ViewerPreferences 1647 0 R>> ), for this chart you can just drop the 'M' from the front and add an extra at the back (M3 = 3mm, M4 = 4mm. The formal values must be obtained from ISO 965-1 or from the below chart. or ANSI/ASME B1.13M-1995. However, for manufacturing and machining, you need the allowable range of each dimension. Metric Fasteners use a thread Pitch. 3.60. Pitch is the distance between adjacent thread crests. 0000004531 00000 n 9.0. . number (e.g., #10 or No.10). %PDF-1.7 These values are calculated according to the thread class (See below). The basic dimensions can be used for design. 0000025729 00000 n Mechanical Tolerances Specs <> <> endobj 17 0 obj Metric to US Conversion Table for common fastener sizes Below is a table common fastener sizes and lengths and their US (Inch) decimal and closest fraction equivalent. ISO metric threads consist of symmetric V-shaped thread. The 1st choice column follows the R10 series from ISO 3, while the 2nd choice column is rounded off values from the R20 series from ISO 3. <> . Plastics Synthetics Do not use these values for standard metric external thread design. Coarse Thread Sizes Fine Thread Sizes Design & Manufacturability The basic dimensions are nominal dimensions of a metric thread profile without allowance and tolerances (The thread class defines that). 0.125H = 0.108253P, Copyright 2000 - BA threads are used for sizes under 1/8 inch the older British fastener system. All rights reservedDisclaimer | [7], The thread values are derived from rounded Renard series. All units in mm. Number of Starts - One. It is preceded by a and consists of two or four characters. For instance, when a screw or bolt measures 5.9mm, it is called a 6mm thread. 0000013841 00000 n Once the Td, TD, es & EL values are known the final limits can be calculated according to the below formulas. We don't collect information from our users. The thread angle is 60o and the thread depth is 0.614 x pitch. These applications will - due to browser restrictions - send data between your browser and our server. Coarse pitch . If the class is omitted, the default class is used. 0000000016 00000 n Where: H = P ( 3 1/2 / 2 ) = 0.866025 P or THREAD CHART 10b Thread Charts Screw Threads Threaded fasteners thread detail with eight charts and video showing thread production with a link to a history of threads. endobj 8 0 obj Hardware, Metric, ISO Metric Coarse Metric Fine BSF/BSW UNC UNF; M2 x 0.4--1-64: 1-72: M2.5 x 0.45--3-48: 3-56 . Design & Manufacturability [8] Fine and superfine threads also have a greater minor diameter than coarse threads, which means the bolt or stud has a greater cross-sectional area (and therefore greater load-carrying capability) for the same nominal diameter. production fields of machining. M24 x 1.5. We don't save this data. Inch mm 19 Jan 2018 AT 4 R P: 1-800-265-8772 F: 1-888-252-6380 www. Lubrication Data Apps You case use them directly, utilize our ThreadCalculator[ , or browse the below charts. Do not use these values for standard metric internal thread design. Spring Design Apps Metric thread callouts are fundamentally different because the thread pitch is specified instead of threads per inch or per mm. The table below is not complete. The approximate allowance can be calculated according to the below formulas: Unfortunately the above formulas are approximations only. Metric thread marks: M20-6H, M201.5LH-6g-40, where M means metric common thread, 20 means the nominal diameter of the thread is 20mm, 1.5 means the pitch, LH means left-handed, 6H, 6g means the thread accuracy grade, The uppercase precision grade code represents the internal thread, the lowercase precision grade code represents the external Note that the ISO 724 standard specifies threads up to M 300. H = P ( 31/2 / 2 ) = 0.866025 P or 0.125H = 0.108253P. The below video provides a short explanation of the threading terms. The table below is not complete. Superfine pitch metric threads are occasionally used in automotive components, such as suspension struts, and are commonly used in the aviation manufacturing industry. Please read AddThis Privacy for more information. Metric Metric thread sizes are specified by diameter and pitch, which is the space between threads. If you don't know the pitch, choose coarse threads; they're the industry standard. (See above table). Engineering Forum The table below shows various dimensions and the required tap drill diameter of coarse and fine threads M1 through to M68. In the plane of the thread axis, the flanks of the V have an angle of 60 to each other. In German, DIN 931: M1,6 to M39 Hexagon head bolts (Product grades A and B), IS 9519: Fasteners - Hexagon products - Width across flats, Metric screw thread profile, dimensions and tolerances, https://en.wikipedia.org/w/index.php?title=ISO_metric_screw_thread&oldid=1137685462. Note - Metric screw diameters usually start with "M" (M3, M4, M5. 0000006324 00000 n Plot No. ASME B1.1 UNF - Fine pitch thread. as screw size. 1.Thread sizes in inches are specified by diameter and threads per inch. Other (usually smaller) sizes may occur to reduce weight or cost, including the small series flange bolts defined in ISO 4162 which typically have hexagonal head sizes corresponding to the smaller 1st choice thread size (eg. 0000025364 00000 n Here is the metric thread sizes table defines standard metric external thread size M1.6 to M18 per. UNC - Coarse Putch thread. Heat Transfer If no characters follow the M and diameter, it means that all the other parameters are according to the default as defined in ISO 965-1: The ISO Metric Thread System consists of two series: The below charts show all the possible thread size combinations of diameters/pitch as defined in ISO-261. All these parameters are derived from simple formulas based on the threads nominal diameter and pitch. In stock and ready to ship. click on the images UNC-UNF SUPPLIERS BSW-BSF SUPPLIERS HISTORY OF THREADS THREAD ROLLING VIDEO quick view The Thread Rolling Process by counting the number of threads in an inch. ISO Metric Thread Defaults: Pitch - According to the Coarse pitch series. M10 x 1. For the size M6 1 mm, the pitch is coarse; while the size M6 0.75 mm has a fine of Threads/Inch UNC UNF UNEF mmUNM NPT METRIC Dia. Pressure Vessel oo^>~/o^}u~zw7y|sy>:|'?t;w~W~3u0it\LNg}{c>/W;|??hV8]ECe~AM?,{}y q4C? ANSI/ASME B1.13M-1995. However, here's a quick overview from the chart: The M2 screw size has a diameter of 1/16 inch. All units in mm. Friction Engineering xms$+B OO - 361006, Email: apollointnl@gmail.com Use the dimensions of your bolt to determine the appropriate size nut. We have discussed the basic thread terms including thread diameters, crest, root and more definitions in the last article. Excel App. 0000003268 00000 n Click the Thread Link to get the Full Thread Data for all classes in Inch and Metric units. M4 x 0.5. Structural Shapes A table to help find the nearest sized metric coarse, metric fine, BSF, BNW, UNC and UNF fasteners. Hardware, Metric, ISO The consent submitted will only be used for data processing originating from this website. Section Properties Apps We still do not know however if it is 1.0 or 1.5 thread pitch (or some other pitch). Plastics Synthetics View our thread pitch chart here to get more ideas about different thread sizes. Google use cookies for serving our ads and handling visitor statistics. Heat Transfer 0000002218 00000 n A metric ISO screw thread is designated by the letter M followed by the value of the nominal diameter D (the maximum thread diameter) and the pitch P, both expressed in millimetres and separated by the multiplication sign, (e.g. #0 DIA = 0.059 #1 DIA = 0.073 #2 DIA = 0.086 #3 DIA = 0.099 #4 DIA = 0.112 (e.g. Metric Thread: Metric is one of the first internationally agreed general-purpose thread types. Metric External (Fasteners) Thread Designations Sizes M1.6 - M18 Metric External (Fasteners) Thread and Fastener Sizes M20 - M50 Screw Thread Designations, Minor Diameter, Major Diameter, Pitch Diameter UN Inch Internal Screw Threads Formulas and Calculator per. ANSI/ASME B1.13M-1995. The coarse pitch is the commonly used default pitch for a given diameter. stream When the diameter smaller than 1/4, the value is indicated by a number, like #1 or No.1. 0000005426 00000 n ). All units in inches. Electric Motor Alternators 0000023992 00000 n METRIC THREAD - Drill & Tap Chart Coarse Thread Sizes. Pumps Applications In general, smaller fasteners have finer threads, so they have a lower thread pitch. The thread pitch is the distance between threads expressed in millimeters. Hexagonal (generally abbreviated to "hex") head widths (width across flats, spanner size) are for DIN 934 hex nuts and hex head bolts. Inch thread sizes are specified by diameter and threads per inch. In the plane of the thread axis, the flanks of the V have an angle of 60 to each other. Several ISO standards define together the ISO metric thread system: The description always begins with a capitalM, followed by thenominal thread diameterin millimeters. The V-shaped thread form has a 60 flank angle and male and female threads are both parallel. endobj 5 0 obj 2 0 obj 2023, by Engineers Edge, LLC www.engineersedge.com Excel App. Tolerance fields Charts - Per diameter and pitch. METRIC BOLT SIZE CHART - Stud Bolt to Nut Size Chart Metric Stud Bolt To Nut Size Chart Our metric stud bolt to nut table is meant to help determine the correct size bolt or nut for your purpose. ISO 965-1 Calculator, Internal Metric Thread and Fastener Sizes M 9 - M 24, Internal Metric Thread and Fastener Sizes M 24 - M 50, Internal Metric Thread and Fastener Sizes M52 - M72, Internal Metric Thread and Fastener Sizes M75 - M120, Internal Metric Thread and Fastener Sizes M125 - M180, Internal Metric Thread and Fastener Sizes M185 - M230, Internal Metric Thread and Fastener Sizes M235 - M600. Thread Form Type. ISO 965-1 Calculator, Fastener Thread Designations and Definitions Pitch, Minor, Major Diameters, Standard External Metric Thread and Fastener Sizes M 0.25 - M 1.4, Metric External Table Chart Thread Sizes M 20 - M 55, Metric External Table Chart Thread Sizes M 56 - M 78, Metric External Table Chart Thread Sizes M 80 - M 100, Metric External Table Chart Thread Sizes M 105 - M 135, Metric External Table Chart Thread Sizes M 140 to M 175, Metric External Table Chart Thread Sizes M 180 to M 255, Metric External Table Chart Thread Sizes M 260 to M 1060. 20 35 For example, a port size of M12 1,5 means a thread O.D. For guidance only. Thread Dimensions - Imperial Thread Sizes Chart Here are two imperial thread sizes table defines thread dimensions of coarse threads (UNC/UNRC) and fine threads (UNF/UNRF). All rights reservedDisclaimer | Engineering Mathematics Where: H = P ( 3 1/2 / 2 ) = 0.866025 P or The designation of a screw thread gives the thread symbol, the nominal size, the pitch, and the thread tolerance class (Ex: M6 x 1 - 5H6H). Cells with Golden Background - Values are derived from the above defaults. HVAC Systems Calcs The ThreaDoctor includes 3 sub-apps: Metric Thread Calculator, UN thread Calculator, and NPT thread Calculator. In internal thread tolerance class designation, the pitch diameter tolerance is followed by minor diameter tolerance. Finishing and Plating startxref Power Transmission Tech. 0000002833 00000 n For the size M6 1 mm, the pitch is coarse; while the size M6 0.75 mm has a fine pitch. 0000004986 00000 n Definitions of terms are located below the chart. Engineering Mathematics Hydraulics Pneumatics [5][6] ISO 262 specifies a shorter list of thread dimensions a subset of ISO 261. The tolerances TD for internal threads and Td for external threads is derived from the class. This data can be found in ISO 951-1 or in the Limits and Dimensions section below. Important: Ensure that "Actual size" (no page scaling) is selected when . 0000016080 00000 n Metric Threads - Coarser Threads The table below indicates some of the most used coarse threads up to size M 68. Training Online Engineering, Fastener and Screw / Bolt Design, Formula and Calculations, Length of Screw Thread Engagement per. Each thread is characterized by its major diameter and its pitch. Materials and Specifications %%EOF The above formulas are approximations. M81.25). Figure 1 Basic profile of ISO metric thread 1 Figure 2 Basic dimensions 6 Figure 3 Tolerance positions with respect to zero line (basic size) 15 . . Tables of the derived dimensions for screw diameters and pitches defined in ISO 261 are given in ISO 724. Do not use these values for standard metric internal thread design. (@xML{|Oe)SN)^p7'oBi0T:r_Q3. Engineering Calculators Spring Design Apps The below data and explanations are based on ISO 965-1. The next step in identifying your thread type is to determine the pitch size. Major Diameter mm d=D. METRIC THREAD -- EXTENDED THREAD SIZE RANGE http://mdmetric.com/tech/M-thead%20600.htm[2014-04-03 09:32:56] MARYLAND METRICS THREAD DATA CHARTS ]W?ozKWkg7Z):J93N-6.\m[(RNJl%\XM?|^^P?"ruXvAot/guxfa8|dqL$|_^d:|vLW7?y5e.,&~eYie[/+;iV3Uk~DT^67_^,*wAU,|iG{Loug]L4ib]]p`n:(|N ;7lO/mj^0ZKL~bcsT?r/zb&E|/O\V'+Z;qqf~\/x c78Owv^o;$^?_/wq&\n|/ fZ\NQG#O1 yo?@P84J_]nx&_X^Wq]Pf9v t~)H?S>t.ALr.)\. endobj 9 0 obj ISO 724 specifies basic dimensions of metric threads in accordance with ISO 261. If you are looking for Brass, Copper & Other Metal Components manufacturers? [4]:17, The length of a machine screw or bolt is indicated by a following and the length expressed in millimetres (e.g. endobj 11 0 obj ISO 68-1: ISO general purpose screw threads Basic profile Metric screw threads. Engineering Standards Engineering Forum Materials and Specifications All dimensions are in inches. xref Inch thread sizes are specified by the nominal major diameter and the number of threads per inch. 0000022942 00000 n They are defined in ISO 3, with "1st choice" sizes being from the R10 series and "2nd choice" and "3rd choice" sizes being the remaining values from the R20 series.[5]. Fastener and Screw / Bolt Design, Formula and Calculations. The following table chart are standard metric internal thread sizes M 0.25 - M 8 per. referenced in the table below (e.g. Electric Motor Alternators 0000018204 00000 n Applications and Design 4353, GIDC Phase - III, trailer Videos Design Manufacture HVAC Systems Calcs Here well focus on the thread dimensions explain and the standard imperial/metric thread sizes chart. [2] Each thread is characterized by its major diameter, D (Dmaj in the diagram), and its pitch, P. ISO metric threads consist of a symmetric V-shaped thread. 1 mm = 0.039 inches Metric Bolts - Proof Loads 8 corresponds to 0.164"). M8). stream For Metric parallel threads, taking a caliper reading of the threads outer diameter in millimetres (mm) will give a reading of the exact thread size but not the thread pitch. Electronics Instrumentation For example, a caliper reading of 12.03mm indicates it is very likely a 12mm thread. Thread Size: Tap Drill (mm) Thread Size: Tap Drill (mm) Thread Size: Tap Drill (mm) . Thread Sizes (Dimensions) Explained Imperial & Metric Thread Sizes Chart | CNCLATHING, Thread Types, Terms, Designation, and How to Identify & Measure Threads | CNCLATHING, Bolts Types and Sizes: Metric & Imperial Bolt Dimensions Chart | CNCLATHING, What are UNF Threads and UNC Threads? There are two common methods to write the thread dimensions. | Contact, Home threads in thin-walled pipes). endobj 10 0 obj endobj 12 0 obj Thermodynamics Friction Engineering 0000026129 00000 n For example, for M8 X 0.75 5g6g, the class is 5g6g. To view Metric translation click the Thread Link UNF Series Basic Dimensions chart Click the Thread Link to get the Full Thread Data for all classes in Inch and Metric units. Machine Design Apps Measure screw diameter, or screw size, by measuring the width of the threaded part of the screw. Threads are called out by O.D. 20 0 obj <> endobj TPI stands for Threads Per Inch, which means the total number of threads per inch measured along the length of a fastener. ISO Metric Thread Charts ISO Metric Thread Chart | Metric Thread Dimension This is also referred to as the "major" diameter in the information below. The "M" designation for metric screws indicates the nominal outer diameter of the screw thread, in millimetres.
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