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. HVAC Systems Calcs Videos Design Manufacture We will provide you the solution within 24 hours! In the ISO metric system a decimal point is made with a comma instead of a period. These applications will - due to browser restrictions - send data between your browser and our server. Physics Power Transmission Tech. <>
Class - 6g for external threads and 6H for internal threads. The tolerances TD for internal threads and Td for external threads is derived from the class. Threads are called out by O.D. M500 6g in external threads). 0000011192 00000 n
Power Transmission Tech. 15.0. The next step in identifying your thread type is to determine the pitch size. So, your search ends here! Metric Thread Size Chart Product Table Tap Size Diameter (in) Diameter (mm) Thread Count (TPI) Thread Pitch (mm) Tap Drill Size M24x1 0.9449 24.0000 ~26 1.000 23 mm M24x1.5 0.9449 24.0000 ~17 1.500 22.5 mm M24x2 0.9449 24.0000 ~13 2.000 22 mm M25x2 0.9843 25.0000 ~13 2.000 23 mm
How to Measure Screw Thread Size | McMaster-Carr In this guide, we demonstrate how to measure screw thread size for inch and metric systems of measurement. Engineering Mathematics endobj
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While a ruler could be used to calculate the pitch size, a pitch gauge is highly . Hardware, Metric, ISO The "M" designation for metric screws indicates the nominal outer diameter of the screw thread, in millimetres. In general, smaller fasteners have finer threads, so they have a lower thread pitch. Excel App. We don't collect information from our users. Do not use these values for standard metric external thread design. [ 13 0 R]
production fields of machining. ANSI/ASME B1.13M-1995. Pumps Applications 9.0.
PDF ISO metric screw threads - Lawrence Berkeley National Laboratory Here are two imperial thread sizes table defines thread dimensions of coarse threads (UNC/UNRC) and fine threads (UNF/UNRF). We still do not know however if it is 1.0 or 1.5 thread pitch (or some other pitch). 1.Thread sizes in inches are specified by diameter and threads per inch.
METRIC THREAD - Drill & Tap Chart - shender4.com The above formulas are approximations. Hexagonal (generally abbreviated to "hex") head widths (width across flats, spanner size) are for DIN 934 hex nuts and hex head bolts. All units in inches. Flat Plate Stress Calcs
External Metric Thread Table Chart and Fastener Sizes M1.6 - M18 threads in thin-walled pipes).
Metric to US Conversion Table for common fastener sizes - Monster Bolts Thread sizes are not directly interchangeable.
ANSI/ASME B1.13M-1995. . Metric Thread: Metric is one of the first internationally agreed general-purpose thread types. 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. stream
Bolt Depot - Printable Fastener Tools All units in mm. Metric Threads Per ISO 68-1, ISO 261, and ISO 965-2. Mechanical Tolerances Specs For the size M6 1 mm, the pitch is coarse; while the size M6 0.75 mm has a fine pitch. <>
Training Online Engineering, Fastener and Screw / Bolt Design, Formula and Calculations, Length of Screw Thread Engagement per. | CNCLATHING, What is Thread Milling & How Does a Thread Mill Work | How to Thread Mill | CNCLATHING, List of Drill Bit and Tap Sizes Drill Size Chart and Tap Size Chart | CNCLATHING, What is NPT Thread & NPT Thread Dimensions NPT Thread Size Chart | CNCLATHING, Machine Screw Diameters Chart and Unified National Thread Sizes What is a Machine Screw | CNCLATHING, Rivet Hole Size Chart & How to Determine the Rivet Size | CNCLATHING. The ISO metric screw thread is the most commonly used type of general-purpose screw thread worldwide. ]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.)\. 0000004986 00000 n
All rights reservedDisclaimer | M16 x 1. No. <>
The class defines the Deviation (allowance) and tolerance of the thread.
PDF Inch and metric thread pitch charts Inch & Metric Thread Standards Skip to content. Note that the ISO 724 standard specifies threads up to M 300. Fastener and Screw / Bolt Design, Formula and Calculations.
PDF Metric Screw Thread Chart - Best Materials Bearing Apps, Specs & Data Fastener and Screw / Bolt Design, Formula and Calculations. 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. Note: If you can't open these PDF files directly in your browser, you can use a PDF viewer, such as Adobe Reader (free). For metric screws, this is the number of millimeters preceded by the letter M
Diameter is also known
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 . Thermodynamics
Inch & Metric Thread Chart | Carr Lane Mfg. Continue with Recommended Cookies, * Easy access to all the data charts that appear on this page. Materials and Specifications These are the M Profile limiting Dimensionings. stream
Mechanical Tolerances Specs 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. Engineering Calculators The following table chart are standard metric external thread sizes M 0.25 - M 1.4 per. Conversely, in an internal (female) thread (e.g. There are two common methods to write the thread dimensions. Vibration Engineering 0.125H = 0.108253P, Copyright 2000 - Metric Metric thread sizes are specified by diameter and pitch, which is the space between threads. 0
(Valid above 1.6 mm / 0.063) Direction - Right-hand thread. They are based on standard ISO 68-1. Strength of Materials
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The terms coarse and fine have (in this context) no relation to the manufacturing quality of the thread. <>
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. . ANSI/ASME B1.13M-1995.
ISO 724 - Metric Threads - Engineering ToolBox number (e.g., #10 or No.10). [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. 4353, GIDC Phase - III, The values listed in the chart above are the recommended values for a class 2 thread fit. [2] Each thread is characterized by its major diameter, D(Dmajin the diagram), and its pitch, P. ISO metric threads consist of a symmetric V-shaped thread. Each thread is characterized by its major diameter and its pitch. 8 corresponds to 0.164"). Metric thread specifications are different because . Minor Diameter Female Thd. Pitch mm p. Root Radius mm r. Pitch Diameter mm d2=D2.
Size Chart For Cutting Threads | Tameson.com 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 . Plastics Synthetics
Thread Sizes (Dimensions) Explained - Imperial & Metric Thread Sizes Measure thread spacing. United Inch Screw Threads Per ASME B1.1. The formal values must be obtained from ISO 965-1 or from the below chart. a nut) on the other side.
Tap Chart Metric Threads - Carbide Depot Please read AddThis Privacy for more information. <>
For example, a caliper reading of 12.03mm indicates it is very likely a 12mm thread. ISO 261 specifies a detailed list of preferred combinations of outer diameter and pitch for ISO metric screw threads. 0000001956 00000 n
If you would like to change your settings or withdraw consent at any time, the link to do so is in our privacy policy accessible from our home page.. The engineer can select any class for the male and female threads to achieve his design goals. It is common to designate metric fine threads with the capital M plus an indication to their nominal outer diameter and their pitch: The table below indicates the typically used finer threads up to size M 100. For example, a port size of M12 1,5 means a thread O.D. 0000010391 00000 n
Gears Design Engineering The M4 screw size has a diameter of 7/64 inches. Coarse Thread Sizes Fine Thread Sizes The ISO metric screw threads are the worldwide most commonly used type of general-purpose screw thread. Fasteners; C-Class Components; Sofrasar Tunnel Solutions; . Videos Design Manufacture [1] They were one of the first international standards agreed when the International Organization for Standardization (ISO) was set up in 1947. ISO 965-2: Limits of sizes for general purpose external and internal screw threads. of 12 mm and a pitch of 1-1/2 mm. our selection of screws.
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The metric thread sizes are generally expressed as M2 0.25, the thread diameter is 2mm and pitch is 0.25mm.
Structural Shapes
Internal Metric Thread and Fastener Sizes M 9 - M 24 - Engineers Edge The class is written after the pitch. The table below indicates some of the most used coarse threads up to size M 68. The thread pitch is the distance between each thread in mm. endobj
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Metric Screw Size Chart - Guide with Complete Dimensions Coarse pitch . UNEF - Ultra Fine pitch thread. The M6 screw size has a diameter of 9/64 inches. Materials and Specifications Engineering Calculators <>
ThreaDoctor: Advanced Thread Calculator (UN, M, NPT) - Machining Doctor Hardware, Imperial, Inch The approximate tolerances can be calculated according to the below formulas. The approximate allowance can be calculated according to the below formulas: Unfortunately the above formulas are approximations only. Friction Formulas Apps 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. [citation needed]. Pumps Applications Threads & Torque Calcs The design principles of ISO general-purpose metric screw threads ("M" series threads) are defined in international standard ISO 68-1. Let us take an example now - a 3/8-16 (coarse) thread size has a 3/8" nominal major diameter and 16 thread per . Note that the ISO 724 standard specifies threads up to M 300. (See above table).
Metric & Standard Bolt & Screw Size Chart: M2, M4, M5, M6, M8, M10 That is, an M6 screw has a nominal outer diameter of 6 millimetres and will therefore be a well-located, co-axial fit in a hole drilled to 6mm diameter. Metric thread sizes are specified by diameter and pitch, which is the space between
Metric External Thread Dimensions Chart - Amesweb A thread's pitch size is the number of threads per inch or the distance between threads on metric thread types. Engineering Standards To view Inch translation click the Thread Link, To manufacture or measure a thread, one has to know the maximum and minimum permissible values of the basic dimensions. These are the M Profile limiting Dimensionings. Engineering Standards Nominal Size ISO MF. Vibration Engineering Junying Metal Manufacturing has developed high-level manufacturing technique in It is the most commonly used worldwide thread system. UNC - Coarse Putch thread. Download and print metric coarce threads clearance and tap drill chart. 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 . startxref
Note - Metric screw diameters usually start with "M" (M3, M4, M5. Blue Background Default ClassesGreen Background First Choice Classes.Yello Background Second Choice Classes. Welding Stress Calculations If the class is omitted, the default class is used. Click the Thread Link to get the Full Thread Data for all classes in Inch and Metric units. Tap size: Basic major dia (mm) Basic major dia (inch) mm per thread: Drill size (mm) Drill size (inch) For example, for M8 X 0.75 5g6g, the class is 5g6g. 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? These thread sizes and classes represent bolts and screws, as well, as other standard internal threads. Japan has a JIS metric screw thread standard that largely follows the ISO, but with some differences in pitch and head sizes. Manufacturing Processes
METRIC BOLT SIZE CHART - Stud Bolt to Nut Size Chart - MaxPro Corp The printable fastener tools series also includes general charts and tools for identifying and measuring fasteners, including a ruler and thread gauge. This corresponds to the second number of the thread size. Civil Engineering For inches, this is done
Engineering Mathematics TPI is used only with American fasteners. Hydraulics Pneumatics 0000002218 00000 n
Beam Deflections and Stress Several ISO standards define together the ISO metric thread system: The description always begins with a capitalM, followed by thenominal thread diameterin millimeters. <<92DA1EFE4BCA9340A2250E06A512D1FA>]/Prev 50340>>
Feedback Advertising Thread Pitch in mm Coarse Fine THREAD SIZE COMPARISON CHART Dia. (e.g.
Metric Fine Threads Chart - Boltport Fasteners 0000004109 00000 n
Applications and Design Measure screw diameter, or screw size, by measuring the width of the threaded part of the screw. Metric fasteners are specified with a thread pitch, instead of a thread count. M8). 0000023992 00000 n
The design principles of ISO general-purpose metric screw threads ("M" series threads) are defined in international standard ISO 68-1. For example,M8is a thread with a nominal diameter of 8 mm (0.315). The consent submitted will only be used for data processing originating from this website. , Dimensions refer to the basic profile in accordance with ISO 68. Once the Td, TD, es & EL values are known the final limits can be calculated according to the below formulas. Four long charters mean a separate class for the.
2023, by Engineers Edge, LLC www.engineersedge.com Do not use these values for standard metric internal thread design. Hardware, Metric, ISO 0000000996 00000 n
The table below is not complete. <>
It is preceded by a and consists of two or four characters. 20 35
These thread sizes and classes represent bolts and screws, as well, as other standard internal threads. 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. 0000005898 00000 n
All units in mm. In addition to coarse and fine threads, there is another division of extra fine, or superfine threads, with a very fine pitch thread. and pitch in millimeters. Heat Transfer For the size M6 1 mm, the pitch is coarse; while the size M6 0.75 mm has a fine
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Understanding Inch & Metric Thread Callouts. 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 External Thread Chart Limiting Dimensions for M Profile: Thread Designation: Pitch, p . To understand classes, you first need to understand the terms Allowance (Sometimes referred to as deviation) and Tolerances. M10 x 1. Inch mm 19 Jan 2018 AT 4 R P: 1-800-265-8772 F: 1-888-252-6380 www. endobj
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The M5 screw size has a diameter of 1/8 inch. Thread Form Type. Plastics Synthetics This is because extra fine threads are more resistant to coming loose from vibrations. The values are calculated from the definitions of ISO 965-1.
METRIC INTERNAL THREAD DIMENSIONS CHART - Amesweb Some of our calculators and applications let you save application data to your local computer. 0000013841 00000 n
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O8~bS{dIh`nl. * All dimensions are in mm. [5][6] ISO 262 specifies a shorter list of thread dimensions a subset of ISO 261. Add standard and customized parametric components - like flange beams, lumbers, piping, stairs and more - to your Sketchup model with the Engineering ToolBox - SketchUp Extension - enabled for use with the amazing, fun and free SketchUp Make and SketchUp Pro .Add the Engineering ToolBox extension to your SketchUp from the SketchUp Pro Sketchup Extension Warehouse! Threads produced to this standard are interchangeable with threads produced to the metric standard ANSI/ASME B1.13M Metric Screw Threads: M Profile. endobj
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Design & Manufacturability Excel App. 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. 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 ! Fluids Flow Engineering 3.50. In general, smaller fasteners have finer threads, so they have a lower thread pitch. The first number after the letter M is the screw diameter which equals 3 mm. ISO 262: ISO general purpose metric screw threads Selected sizes for.
However, for manufacturing and machining, you need the allowable range of each dimension. Metric Threads - Coarser Threads The table below indicates some of the most used coarse threads up to size M 68. M6 corresponds to 6 mm). . Fluids Flow Engineering Thread sizes are given in nominal sizes, not in actual measurement. HVAC Systems Calcs 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). In tolerance class designation, the pitch diameter tolerance is followed by major diameter tolerance. <>
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Please read Google Privacy & Terms for more information about how you can control adserving and the information collected. H = P ( 31/2 / 2 ) = 0.866025 P The design principles of ISO general-purpose metric screw threads ("M" series threads) are defined in international standard ISO 68-1. For inches, any diameter smaller than 1/4" is indicated by a number,
| Contact Privacy Policy, Home Section Properties Apps Flat Plate Stress Calcs All units in mm. The Metric thread standard ISO 965-2 provides the limits only for classes 6H & 6g*. 3 0 obj
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Electric Motor Alternators ISO Hardware Engineering Data Superfine pitch metric threads are occasionally used in automotive components, such as suspension struts, and are commonly used in the aviation manufacturing industry. - 361006, Email: apollointnl@gmail.com The metric thread sizes are generally expressed as M2 0.25, the thread diameter is 2mm and pitch is 0.25mm. An example of data being processed may be a unique identifier stored in a cookie. To view Metric translation click the Thread Link UNEF Series Basic Dimensions chart Engineering Book Store 0000004531 00000 n
(adsbygoogle = window.adsbygoogle || []).push({}); Copyright 2000 - 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). Google use cookies for serving our ads and handling visitor statistics. Strength of Materials The ISO Standardisation Authority defines strict specifications metric threads. AddThis use cookies for handling links to social media. All units in mm. Pressure Vessel ASME B1.1 Inch Size UN External Screw Threads Formulas and Calculator per. If the pitch is the normally used "coarse" pitch listed in ISO 261 or ISO 262, it can be omitted (e.g. When the diameter smaller than 1/4, the value is indicated by a number, like #1 or No.1. oo^>~/o^}u~zw7y|sy>:|'?t;w~W~3u0it\LNg}{c>/W;|??hV8]ECe~AM?,{}y
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For example, a 1/4-20 (UNC coarse) thread has a 1/4" nominal major diameter and 20 threads per inch, while a 1/4-28 (UNF fine) thread has the same nominal major diameter but 28 threads per inch. In practice this means that one can measure the diameter over the threads of a bolt to find the nominal diameter Dmaj, and the inner diameter of a nut is Dmin. METRIC THREAD - Drill & Tap Chart Coarse Thread Sizes. Electronics Instrumentation d3. These thread sizes and classes represent bolts and screws, as well, as other standard external threads. All units in mm. of Threads/Inch BA BSW BSF BSP Major Dia. endobj
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ANSI External Screw Threads Size Tolerances Chart - Engineers Edge We don't save this data. 0000001991 00000 n
These thread sizes and classes represent bolts and screws, as well, as other standard external threads. All dimensions are in inches. Feedback Advertising However, here's a quick overview from the chart: The M2 screw size has a diameter of 1/16 inch. For example, a 10-24 screw has 0.190" thread diameter and has 23 threads per inch. <>
The metric thread sizes are different from the inch thread sizes. ISO 262 specifies a shorter list of thread dimensions - a subset of ISO 261.
Internal Metric Thread Table Chart Fastener Sizes M 0.25 - M 8 The second number is the screw's pitch which equals 1.25 mm. The choice of the recommended class is made according to two parameters: Type your thread description in the Search Box. Tolerance fields Charts - Per diameter and pitch. Applications and Design Pitch is the distance between adjacent thread crests. It is specified using the nominal major diameter and the number of threads per inch. or Machine Design Apps ISO Metric Thread Charts ISO Metric Thread Chart | Metric Thread Dimension
Fastenerdata - THREAD CHART 10b - Fastener Specifications Tables of the derived dimensions for screw diameters and pitches defined in ISO 261 are given in ISO 724. Welding Stress Calculations For example, a M6 x 1 mm has a 6 mm thread diameter and has 1 mm between threads. Gears Design Engineering ). The clearance drill sizes listed are the most commonly used sizes. For instance, when a screw or bolt measures 5.9mm, it is called a 6mm thread. Note that the ISO 724 standard specifies threads up to M 300. However, ISO 965-1 recommends limiting the choice according to a chart of Recommended Classes. Engineering Book Store 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 Friction Engineering <>/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>>
The following table chart are standard metric internal thread sizes M 9 - M 24 per. ISO 261: ISO general purpose metric screw threads General plan. Where: H = P ( 3 1/2 / 2 ) = 0.866025 P or | Difference Between UNF and UNC Thread | CNCLATHING, Guide to Design and Machining Thread: How to Cut an Internal & External Thread? \( \large T_d(6) \approx 180\times\sqrt[3]{P^{2}}-\frac{31.5}{\sqrt{P}} \), \( \large T_{D1}(6) \approx 433 \times P 190 \times P^{1.22} \), Major (Basic) diameter of internal thread, Major (Basic) diameter of external thread, Minor diameter for external thread root limits, Designation for thread engagement group "Short" / "Medium" / "Long", DIN / SAE / AISI / Wnr / UNS / BS / ANFOR / UNI / UNS / JS. 0000022942 00000 n
The allowance EL for internal threads and es for external threads is derived from the class. 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. 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 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. [7], The thread values are derived from rounded Renard series. Engineering ToolBox - Resources, Tools and Basic Information for Engineering and Design of Technical Applications! Metric fasteners are specified with a thread pitch, instead of a thread count. Thread Size: Tap Drill (mm) Thread Size: Tap Drill (mm) Thread Size: Tap Drill (mm) M4 x 0.35. Do not use these values for standard metric internal thread design. Finishing and Plating %PDF-1.7
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Thread Sizes | Types of Threads | Metric Thread Sizes Chart 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.