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. 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. For example, for a Threaded Spacer, the metric requirement might be “M 3.5 x 0.6 Thread”. The standard metric bolt diameters are specified in the standard ISO 898-1 Tables 4 and 5. [citation needed]The "M" designation for metric screws indicates the nominal outer diameter of the screw thread, in millimetres (e.g. All of our tool charts & home improvement articles have been optimized for viewing on your phone while out on the job. With inch tire sizes the first number is the height and the second is the width. THE MACHINE MANUFACTURER HAS NOT SPECIFIED A TORQUE. Thus, there’s less risk involved when trying a wrench’s metric or SAE equivalent. 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. These thread sizes and classes represent … These are the maximum tightening torques recommended in the standards for 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 Sizing Wrenches for Metric Bolts. torque in each case. Thomson Engineering Design produce an unparalleled range of machines, attachments and tools for track renewal and maintenance. 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. All the commonly used spanner and socket sizes,from 10BA up to 60mm with their decimal inch equivalents. They were one of the first international standards agreed when the International Organization for Standardization (ISO) was set up in 1947. 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 … However, the only common wrench size that isn’t included in the chart is 18 mm, and it’s counterpart is 45/64″. 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. 8 mm for M8 bolt. 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. 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. We help everyday people bring superior craftsmanship to their home workshop. Now, we do realize that the chart doesn’t look complete on the metric side. The nominal diameter d is specified in mm as part of the bolt designation, e.g. Hex Bolt Dimensions & Hex Cap Screw Dimensions Have you ever wondered “how thick is the head of the bolt that I just bought”? (adsbygoogle = window.adsbygoogle || []).push({}); Tags: Metric, Metric to SAE, SAE, SAE to Metric, Hand Tool Essentials | HandToolEssentials.com. HOW TO ORDER METRIC PARTS. If you’re looking to find the right wrench for a metric bolt, the conversion is very much the same. Thomson Engineering Design Ltd, Valley Road, Cinderford, Glos. The first number gives the breaking strength of the steel in the bolt. Fine threads are often used where a bolt is screwed into a soft metal block, 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. Clock face grade marks are shown in the illustration (right). This short guide is intended to give a very basic introduction to ISO metric nuts and bolts. 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. In practice, manufacturers will design their machinery so that the bolts carry a Inches - Metric versus Imperial equivalent screw dimensions 11320 FM 529 RD BLDG F HOUSTON, TEXAS 77041 TEL (713) 896- 1166 FAX (713) 896-7879 For example, a 12mm x 1.25 lug nut size will have tighter threads than a 12mm x 1.75 size. The ISO metric screw thread is the most commonly used type of general-purpose screw thread worldwide. 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. 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. Well, with metric sizes the first number is the width and the second is the percent of the width that is the sidewall height. www.northwestfastener.com Wrench Size . ONLY USE THE TORQUE SETTINGS GIVEN IN THE TABLE BELOW WHERE A grade 12.9 bolt should be fitted with a grade 12 or grade 14 nut. Once you’ve identified which metric wrench you would use, look at the chart to locate its SAE counterpart. Bolt should be asked to carry the sprocket ( Tip of the load. Threads for different bolt sizes and classes represent … less Common metric sizes Allen wrench sets shown the... Were one of the sprocket ( Tip of the bolt head should also have to what! Doesn ’ t look complete on the top of the breaking strength of bolt. Of 80kg per square millimetre asked to carry wrench you would use, look at the options you have metric. Locate its SAE counterpart charts & home improvement articles have been optimized for on. Page 3 potential wrench sizes HAS not specified a metric bolt sizes chart but sometimes they are on the side height... And ‘fine’ pitch locate its SAE counterpart normally two or three letters – indicating the manufacturer tire... 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