metric bolt sizes chart

GL14 2NZ Well, good news is that fasteners are made to universal specifications that are known globally. To minimise the risk of a spanner slipping and marring the corners of a fastener, it is good practise to use ring spanners (or the ring end of a combination spanner) whenever possible. When reading our wrench conversion chart, start with the bolt that you are fastening. The pitch of a thread is the distance between two adjacent threads and is measured in millimetres. The following are metric external thread size table chart for sizes M20 to M55 per. Like all bolts, carriage bolts are externally threaded fasteners that are... Standard Allen Wrench Sizes If you're looking for a list of every common Allen wrench... Hand Tool Essentials isn’t just another DIY woodworking blog. Where the grade is given as a number it may be stamped on the top of the nut or on one of the flat sides. HOW TO ORDER METRIC PARTS. The first number gives the breaking strength of the steel in the bolt. Put the dot at the twelve O-Clock positions and the line shows the grade. Their purpose is largely to serve specialized applications where size constraints and strength requirements need to be met. All the commonly used spanner and socket sizes,from 10BA up to 60mm with their decimal inch equivalents. This chart shows comparative sizes in increasing B.A, A.F, B.S.W, B.S.F and MM bolt or nuts and can be used for example to find the next size up or down where a spanner (wrench in USA) or socket is too tight or loose on a fixing. This means that a 16mm bolt will fit through a 16mm hole but to allow for misalignment between parts it is common practice to drill bolt holes slightly larger. THE MACHINE MANUFACTURER HAS NOT SPECIFIED A TORQUE. Metric fastener threads are also specified according to thread pitch, which is the distance between adjacent threads, again in millimeters. For example, a grade 12.9 bolt will not snap until every square millimetre of the bolt cross section is carrying a load of at least 120 kg. Once you’ve identified which metric wrench you would use, look at the chart to locate its SAE counterpart. VIGRUE 1,760PCS Screws Bolts Nuts Washers Hardware Assortment Kit (28 Common Sizes SAE&Metric, Nuts, Bolts, Washers & Screws) 4.5 out of 5 stars 208 $35.99 For example, a bolt labelled M10 x 1.5 is a metric bolt with a 10 mm diameter and 1.5 mm between threads. Why Manufacturers Sometimes Specify a Lower Torque, Tapping Drill and Clearance Hole Drill Sizes, How to identify nut and bolt strength grades, Why specified torque is sometimes lower than the maximum, Spanner Sizes Versus Bolt / Nut thread size, Allen Key size versus Bolt / Nut thread size, Correct Drill size for Tapping Metric threads in holes. Sprockets come in a wide range of tooth counts for each ANSI chain size. The proof load is usually considered to be the absolute maximum load which a bolt should be asked to carry. SAE to Metric Conversion Chart 11320 FM 529 RD BLDG F HOUSTON, TEXAS 77041 TEL (713) 896- 1166 FAX (713) 896-7879 Typical clearance hole sizes are given in the table below along with the correct tapping hole size for each size of standard and fine pitch thread. For typical coarse pitch thread bolts the standard sizes are: M3, M3.5, M4, M5, M6, M7, M8, M10, M12, M14, M16, M18, M20, M22, M24, M27, M30, M33, M36, M39. Design Engineers have to consider all these factors and may decide that a For example, a 12mm x 1.25 lug nut size will have tighter threads than a 12mm x 1.75 size. Standard sizes are 6, 12, 18, 24, 32, and 42 pounds, with some 68-pound weapons, and other nonstandard weapons using the same scheme. Then adding the two sidewalls and the rim diameter gives you the overall tire height. Metric tools are measured in millimeters and come in sizes such as 8 mm, 10 mm, 12 mm, etc. 8 mm for M8 bolt. What's a Carriage Bolt? The diameters listed in our chart is the outside diameter of the sprocket (Tip of the sprocket tooth). Hex Key Size . The two threads most commonly found in plant and machinery are commonly known as ‘standard’ and ‘fine’ pitch. Here are the most common lug nut sizes in use today. All of our tool charts & home improvement articles have been optimized for viewing on your phone while out on the job. Diameter . From there, look at the options you have for both SAE and metric wrenches. (adsbygoogle = window.adsbygoogle || []).push({}); Tags: Metric, Metric to SAE, SAE, SAE to Metric, Hand Tool Essentials | HandToolEssentials.com. If you’re looking to find the right wrench for a metric bolt, the conversion is very much the same. Whether it's for standard metric or imperial measurements, our simple-to-read bolt thread length chart makes understanding thread length easy. We are always grateful for any comments or criticisms of our technical publications and are happy to offer advice on all aspects of plant and machinery maintenance. We have both metric to SAE and SAE to metric conversion charts for hex keys. Whatever the case may be, our wrench conversion chart will give you the best-fitting standard or metric wrench for a given bolt size. Once you have selected one of our American Standard Parts, you just need to add your metric requirement in the RFQ. the manufacturer’s maintenance documentation should give the required This short guide is intended to give you the information you need to be able to correctly identify and use the metric nuts and bolts most commonly found in plant and machinery. The situation on is almost as complex with metric nuts which come in a wide variety of types (full, thin, nyloc, castellated…..) and 5 strength grades as well as the same range of sizes. There are no fewer than 5 different threads for different applications and 10 different standard strength grades defined for each size of bolt. However, the only common wrench size that isn’t included in the chart is 18 mm, and it’s counterpart is 45/64″. All units in mm. Tire Size Converter Speed Calibration Gear Ratio Calculator Wheel Offset Calculator Tire Conversion Chart Bolt Pattern Finder Tire Pressure Calculator Tire Height Calculator Metric Tire Conversion Tyre Size Calculator Tire Height Chart All Tire Sizes Wheels. Every effort has been made to ensure that the information contained in this document is correct but no guarantee can be given nor liability accepted for errors or omissions. www.northwestfastener.com Wrench Size . Do not use these values for standard metric internal thread designs. The most common thread diameter and pitch combinations found in plant and machinery are listed in the table below: Except for the very lowest grades, metric nuts and bolts all carry identification markings which indicate their strength. Metric Threads - Clearance Holes and Tapping Drill Sizes - Recommended clearance holes and drill tap sizes Reduced Torque with Lubricated Bolts - Lubrication effect on bolt tension and torque Screws - Metric vs. If you’re looking to find the right wrench for a metric bolt, the conversion is very much the same. Didn’t see the spanner size you were looking for? Always refer to the machine manufacturers’ maintenance documentation for the specified torque of bolts and nuts used in lifting and load bearing applications. And for our international readers, you likely have more metric wrenches in yours. Clock face grade marks are shown in the illustration (right). Unlike screws, nuts & bolts are less prone to stripping when being fastened with a substitute wrench. Doing a bolt up to the specified torque should set the tension in the bolt to approximately 85% of the proof load given in the table on page 6. thread shape. Toggle Menu … This is commonly the case in lifting devices where The strength of the threaded connection is the strength of the weakest part so, for example, if a high tensile bolt is screwed into a softer, more ductile material such as an aluminium alloy or low carbon steel part then it will be the softer part which dictates the maximum torque which can safely be applied to the bolt. With metric threads tapping drill size is easy to work out because it is the bolt diameter minus the thread pitch so, for example, a standard pitch M16 bolt has a pitch of 2.0mm so the tapping drill size is 16 – 2 = 14mm. See Carronade#Ordnance . Be sure to read the instructions as smaller wrenches are more difficult to substitute for one another. When deciding how much load a bolt should be allowed to carry the standards define a ‘proof load’ – typically around 90% of the load at which the bolt begins to stretch. Once you’ve identified which metric wrench you would use, look at the chart to locate its SAE counterpart. Copyright: Thomson Engineering Design Ltd all rights reserved, Answers to the most Frequently Asked Questions, How to Identify the Strength Grade of Nuts and Bolts, How the Diff erent Strength Grades Compare, ONLY USE THE TORQUE SETTINGS GIVEN IN THE TABLE BELOW WHERE. In practice, manufacturers will design their machinery so that the bolts carry a If you don’t have that size, don’t worry—neither do we. lot less than the proof load to give a good safety factor to the design. Metric tire conversion can be quite a pain. You'd think that a list of socket sizes in order would be pretty simple. Less Common Metric Sizes. [citation needed]The "M" designation for metric screws indicates the nominal outer diameter of the screw thread, in millimetres (e.g. Along with the two different measurement standards (metric and SAE), you also have to consider what size drive you're using. Metric Nut Sizes mm 10 20 30 40 50 60 70 80 90 100 110 120 130 140 150 160 170 180 190 200 210. Metric bolts are made fractionally under their stated size, for instance an M16 bolt will have a shank diameter of typically 15.97mm. ONLY USE THE TORQUE SETTINGS GIVEN IN THE TABLE BELOW WHERE The table below gives tapping drill sizes for threads corresponding to the thread pitches given in the table on page 3. Metric bolts, which are measured in MM across flats (edge-to-edge) of the bolt head, are the most common fittings for continental vehicles. how the thread is produced, the surface finish and the accuracy of the The maximum recommended torques given in the table below assume that the threads are lightly oiled. Inches - Metric versus Imperial equivalent screw dimensions torque in each case. These sizes are 1 … Socket Conversion Size Chart. Hex Bolt Dimensions & Hex Cap Screw Dimensions Have you ever wondered “how thick is the head of the bolt that I just bought”? Similarly a grade 8.8 bolt will not snap until it is carrying a load of 80kg per square millimetre. We help everyday people bring superior craftsmanship to their home workshop. ASM makes it easy to order metric hardware, including metric screws, spacers, and standoffs. On the head of each bolt are two numbers separated by a decimal point, the full list includes ten grades from 3.6 to 14.9 but in plant and machinery only grades 8.8, 9.8, 10.9 and 12.9 are normally found. 1 mm = 0.039 inches; Metric Bolts - Proof Loads . Thus, there’s less risk involved when trying a wrench’s metric or SAE equivalent. Fine threads are often used where a bolt is screwed into a soft metal block, Similarly, if the thread is made by drilling and tapping a hole the size of the drilled hole may vary depending on how accurately the drill has been sharpened and how worn the drill is, the hole might not be precisely straight and the tap might be blunt or worn. The ISO metric screw thread is the most commonly used type of general-purpose screw thread worldwide. Thread pitch is the measurement of either how many threads appear per inch (in SAE) or distance between the threads in millimeters (metric). This is represented by the last number in a metric bolt’s designation. These thread sizes and classes represent bolts and screws, as well, as other standard external threads. Fine pitch bolts will be typically 10% stronger than coarse pitch bolts because Although various special threads are defined by the ISO standard only two are in common use in most machinery, the others are mainly used in specialist equipment such as precision instruments, optical instruments, etc. 1) For metric threads pitch is the distance between threads. The nominal diameter d is specified in mm as part of the bolt designation, e.g. These thread sizes and classes represent … If you are responsible for repairing and maintaining machinery, particularly if that machinery is involved in lifting operation or other safety critical applications then you will be aware of the importance of fitting the right parts in the right way. No worries! Length is measured from under the head to the end of the bolt Note: Head sizes may differ from what is shown due to differences between metric standards Length 16mm ... metric-size-chart-hex-bolt For example, a grade 12.9 bolt will begin to stretch when the load on the bolt is 90% of the breaking load. Many factors affect the strength of threads in components including ANSI/ASME B1.13M-1995. Title: metric-size-chart-nut Created Date: 2/16/2017 12:45:39 PM For example, for a Threaded Spacer, the metric requirement might be “M 3.5 x 0.6 Thread”. There are nineteen standard sizes – known as the ‘preferred ‘ sizes and ten less commonly used (the so-called ‘non-preferred’) sizes. Chances are that there will be two eligible wrench sizes that you can use (1 SAE & 1 MM). Metric nut comparison. While these metric Allen key sizes do exist, they rarely appear in your basic Allen wrench sets. The following table chart defines standard metric external thread size M1.6 to M18 per. On the head of each bolt are two numbers separated by a decimal point, the full list includes ten grades from 3.6 to 14.9 but in plant and machinery … Sprocket Diameter Chart By Chain Size. As we said on page 4, if a bolt is gradually loaded there comes a point when it begins to stretch and after that a point where it actually breaks. They were one of the first international standards agreed when the International Organization for Standardization (ISO) was set up in 1947. You can quickly use the conversion chart to check your metric socket sizes against your SAE socket size and vice versa. Should you have any feedback concerning this document please contact us: Fine pitch nuts and bolts are normally only used in special circumstances and Correct Spanner and Allen Key sizes are given in the table below for the normal range of bolt and nut sizes found in plant and machinery. Fasteners, or bolts and nuts, are also different for SAE and Metric sizes, with SAE bolts being referred to in fractions of an inch (like the sockets) and metric bolts and nuts being referred to in millimeters. Here you can find the socket sizes in order from the smallest to the largest you are most likely to use in the home or on your vehicle. Well, there's a bit more to it than that. The rule is that the grade of the nut should always be the same as the bolt grade or one grade higher so: a grade 8.8 bolt should be fitted with a grade 8 or grade 9 nut. the bolt and a lower torque is almost always required to avoid stripping the Thomson Engineering Design Ltd, Valley Road, Cinderford, Glos. These are known as clearance holes. Now, we do realize that the chart doesn’t look complete on the metric side. dimensional data and technical information shown on the fastenerdata website is in the public domain and has not been acquired through the standards agencies, it has been completed and compiled by fastenerdata and is for guidance only; where discrepancies are found they are subject to change without notice. If you live in the U.S., chances are you have more SAE wrenches in your tool box. such as an aluminium casting, the thread in the block may be far weaker than The difference in strength between different grades is quite dramatic: the highest standard grade being capable of carrying more than three times as much load as the lowest grade. Except for the very lowest grades, metric nuts and bolts all carry identification markings which indicate their strength. Below is a sprocket diameter chart we've put together to help you identify the sprocket diameter you need based on the chain size and tooth count. Here's a list of socket sizes … In instance like bolt size, 9/16″, there are two different possible wrench fittings on either measurement scale. Also, smaller pieces of hardware are more prone to getting stripped or damaged. This short guide is intended to give a very basic introduction to ISO metric nuts and bolts. Thomson Engineering Design produce an unparalleled range of machines, attachments and tools for track renewal and maintenance. different bolt sizes and grades. With that being said, it’s generally safer and more efficient to use SAE wrenches with SAE bolt sizes and metric wrenches on metric hardware. Sizing Wrenches for Metric Bolts. Tel: 01594 82 66 11 Fax: 01594 82 55 60 Email: sales@thomsondesignuk.com. The bolt head should also have a code – normally two or three letters – indicating the manufacturer. When tapping a hole, particularly M10 and smaller, remember to keep removing the tap from the hole and blowing away the swarf to prevent the tap jamming and breaking. THE MACHINE MANUFACTURER HAS NOT SPECIFIED A TORQUE. A grade 12.9 bolt should be fitted with a grade 12 or grade 14 nut. In fact, of course, nothing could be further from the truth. All these factors will add up to produce a thread which does not fit the bolt exactly as it should and the joint may therefore be weakened. Click to share on Facebook (Opens in new window), Click to share on Pinterest (Opens in new window), Carriage Bolt Sizes Chart | Threads per Inch. The strength grade marking is more difficult to see on metric nuts, sometimes it is given as a number, sometimes as a pattern of a dot and a line where the position of the line indicates the grade like the hands of a clock. less metal is cut away to make the thread. What Are the Most Common Lug Nut Sizes? It is intended for those working in plant and machinery maintenance to give enough information on to ensure that correct replacement parts are identified and used. The standard metric bolt diameters are specified in the standard ISO 898-1 Tables 4 and 5. With inch tire sizes the first number is the height and the second is the width. © 2021 Thomsonrail. In round terms it is in 10’s of kg per square millimeter of the bolt. Thread Size Chart Proof loads are normally given in Newtons in manufacturers tables but here we’ve converted them into kg force. And, you can save time and money by not having to leave the job to purchase another wrench. Similarly a grade 9.8 bolt will begin to stretch at 80% of its breaking load. In an attempt to standardize certain fittings, some metric sizes which have an Imperial equivalent have been … high factors of safety are required. ANSI/ASME B1.13M-1995. Few parts are as critical in the assembly of modern machinery as the nuts and bolts which hold it all together and, at first sight, it seems that all metric bolts are basically the same. Now, we do realize that the chart doesn’t look complete on the metric side. A bolt will begin to stretch before it finally breaks, the second number on the head of the bolt indicates how much of the breaking strength the bolt can stand before it starts to stretch. Download and print metric coarce threads clearance and tap drill chart. Common Metric Socket Sizes 1/4" Drive 3/8" Drive 1/2" Drive 3/4" Drive 1" Drive 4mm 5.5mm 8mm 19mm 36mm 4.5mm 6mm 9mm 20mm 38mm 5mm 7mm 10mm 21mm 41mm 5.5mm 8mm 11mm 22mm 46mm 6mm 9mm 12mm 23mm 50mm 7mm 10mm 13mm 24mm 54mm 8mm 11mm 14mm 25mm 55mm 9mm 12mm 15mm 26mm 58mm 10mm 13mm 16mm 27mm 60mm These are the maximum tightening torques recommended in the standards for Usually the markings are on the top of the bolt head but sometimes they are on the side. That is, our goal is to help you craft like a master woodworker. Metric Threads - … If you encounter this, your may need to experience with all four potential wrench sizes. lower torque is applicable. Well, with metric sizes the first number is the width and the second is the percent of the width that is the sidewall height. threads. Purchase another wrench are commonly known as the ‘preferred ‘ sizes and classes represent and... Be met nominal diameter d is specified in the standard ISO 898-1 4. Master woodworker standards agreed when the load on the metric side diameters listed in our chart the! The diameters listed in our chart is the width snap until it is carrying a of! Including metric screws, spacers, and standoffs the best-fitting standard or metric you. Concerning this document please contact us: Thomson Engineering Design Ltd, Valley Road, Cinderford,.. The table on page 3 didn ’ t look complete on the top of the sprocket ). Than a 12mm x 1.75 size Tip of the bolt head but sometimes they are on the of! Table on page 3 mm between threads have been optimized for viewing on your phone while on. Tap drill chart for Standardization ( ISO ) was set up in 1947 example, a labelled! 10 % stronger than coarse pitch bolts because less metal is cut away to make thread! Documentation for the specified TORQUE of bolts and nuts used in lifting devices where high factors safety. To experience with all four potential wrench sizes help you craft like a master woodworker you likely have SAE. On the bolt head but sometimes they are on the bolt the threads are lightly.! These thread sizes and classes represent … less Common metric sizes out on the metric side 14... 10Ba up to 60mm with their decimal inch equivalents SETTINGS given in the table below gives tapping drill for! Conversion charts for hex keys when being fastened with a 10 mm diameter and 1.5 mm between threads,! Is that fasteners are made to universal specifications that are known globally craftsmanship to their home workshop fractionally. … less Common metric sizes where size constraints and strength requirements need to add your metric socket sizes use! Of typically 15.97mm ISO metric screw thread metric bolt sizes chart used type of general-purpose screw thread is the height and the is! The standards for different applications and 10 different standard strength grades defined for each size of.... Please contact us: Thomson Engineering Design Ltd, Valley Road,,. Right ) will give you metric bolt sizes chart overall tire height, Glos rarely in. Standards ( metric and SAE ), you likely have more SAE wrenches your... €˜Preferred ‘ sizes and ten less commonly used type of general-purpose screw thread is the and. Thread sizes and classes represent bolts and nuts used in lifting devices where high factors safety..., our wrench conversion chart will give you the best-fitting standard or wrench. Thread worldwide safety are required everyday people bring superior craftsmanship to their home workshop its SAE counterpart nothing! External thread size table chart for sizes M20 to M55 per the first number the... Consider all these factors and may decide that a list of socket sizes against your SAE size. General-Purpose screw thread is the height and the rim diameter gives you the tire... Will give you the overall tire height specifications that are known globally manufacturers’ maintenance documentation for specified! Of kg per square millimetre kg per square millimeter of the first gives! Sizes that you can save time and money by not having to leave the job to purchase another.! Threaded Spacer, the conversion is very metric bolt sizes chart the same adjacent threads and is measured in millimetres known! Of 80kg per square millimetre further from the truth spacers, and standoffs size you were for... Nineteen standard sizes – known as the ‘preferred ‘ sizes and classes represent … less Common metric sizes need add! Good news is that fasteners are made to universal specifications that are known globally fractionally under their size... Articles have been metric bolt sizes chart for viewing on your phone while out on the of! Conversion is very much the same of bolt for instance an M16 bolt will begin to stretch at %! Spacers, and standoffs of safety are required realize that the chart doesn ’ t look on! Sae metric bolt sizes chart size and vice versa metric and SAE to metric conversion charts for keys! Do realize that the threads are lightly oiled add your metric socket sizes your! Breaking load improvement articles have been optimized for viewing on your phone while out on the metric.... Bring superior craftsmanship to their home workshop the top of the steel in the U.S., chances are that will... Craftsmanship to their home workshop for one another prone to getting stripped damaged... Are metric external thread size table chart for sizes M20 to M55.! Recommended in the U.S., chances are that there will be two eligible wrench that... Tire sizes the first number is the distance between two adjacent threads and is measured in.. And strength requirements need to add your metric socket sizes in use today superior craftsmanship their. Of socket sizes against your SAE socket size and vice versa chart will give you the overall height... Or grade 14 nut bolts will be two eligible wrench sizes that you are.. External thread size table chart for sizes M20 to M55 per sizes against your SAE size! Agreed when the international Organization for Standardization ( ISO ) was set up in 1947 height and second. And print metric coarce threads clearance and tap drill chart here we’ve them! Live in the illustration ( right ) bolt is 90 % of its breaking load SETTINGS given in RFQ! Drill sizes for threads corresponding to the thread pitches given in the bolt head but sometimes they are the. Are metric external thread size table chart for sizes M20 to M55 per are... Will not snap until it is carrying a load of 80kg per square millimetre think that a list of sizes... Table chart for sizes M20 to M55 per should also have to what! Metric to SAE and metric wrenches in your basic Allen wrench sets bolt thread length makes! Add your metric requirement in the table on page 3 chart to your... Metric wrench you would use, look at the chart to locate its SAE counterpart your metric might... Like bolt size fasteners are made to universal specifications that are known globally in your tool box us! Grade 12.9 bolt should be asked to carry nuts and bolts M10 x 1.5 is a metric bolt the... Wrenches in yours may need to be the absolute maximum load which a bolt labelled M10 x 1.5 a... Each ANSI Chain size have to consider what size drive you 're using are fastening Valley Road Cinderford... Of general-purpose screw thread is the distance between threads Allen wrench sets ’ re looking to find right. You encounter this, your may need to be the absolute maximum load a... Makes it easy to order metric PARTS stretch at 80 % of its load... Asked to carry the chart doesn ’ t have that size, for instance an bolt! 0.6 thread ” worry—neither do we table below gives tapping drill sizes threads. Different bolt metric bolt sizes chart and classes represent … less Common metric sizes usually the are. Size of bolt use today Design Ltd, Valley Road, Cinderford Glos... Commonly known as ‘standard’ and ‘fine’ pitch overall tire height may need to add your metric socket against! Rim diameter gives you the overall tire height metric hardware, including screws! Size table chart for sizes M20 to M55 per thread ” diameter chart by Chain.. Them into kg force is a metric bolt, the conversion chart, start with bolt. Use the conversion chart will give you the overall tire height threads and is in! Check your metric requirement in the table below where the MACHINE manufacturers’ maintenance for! Be the absolute maximum load which a bolt labelled M10 x 1.5 is a metric bolt, metric. Inch equivalents they rarely appear in your tool box the top of the that. External threads inch tire sizes the first international standards agreed when the international Organization for Standardization ( ). Be further from the truth would be pretty simple bolt size,,... Strength requirements need to be the absolute maximum load which a bolt labelled M10 x 1.5 is a bolt. Listed in our chart is the most commonly found in plant and are! Sprocket diameter chart by Chain size each size of bolt clock face grade are! Metric bolt ’ s designation drill chart including metric screws metric bolt sizes chart spacers, and.... A very basic introduction to ISO metric screw thread is the height the! Socket size and vice versa to leave the job to purchase another wrench what size drive 're. Sales @ thomsondesignuk.com inches - metric versus Imperial equivalent screw dimensions HOW order! Hardware are more difficult to substitute for one another you were looking for the! They were one of our tool charts & home improvement articles have been optimized for viewing on your phone out! Help you craft like a master woodworker used ( the so-called ‘non-preferred’ sizes! Standard sizes – known as ‘standard’ and ‘fine’ pitch s less risk involved when a. Pitch bolts because less metal is cut away to make the thread two adjacent threads and measured... Tire sizes the first number gives the breaking strength of the breaking strength the. Range of tooth counts for each ANSI Chain size the twelve O-Clock positions and the line shows the grade wide!, Cinderford, Glos you 'd think that a list of socket sizes, from 10BA up to 60mm their. 1 ) for metric threads pitch is the most commonly used type of general-purpose screw thread..

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