![]() ![]() ISO 262 selected sizes for screws, bolts and nuts ISO 262 specifies a shorter list of thread dimensions – a subset of ISO 261. ISO 261 specifies a detailed list of preferred combinations of outer diameter D and pitch P for ISO metric screw threads. Internal threads are designated by upper case letters, G or H. If, for instance, only M20 is given then it is coarse pitch thread.Įxternal threads are designated by lowercase letter, g or h. Tolerance classes defined in ISO 965-1 can be appended to these designations, if required (e.g., M500– 6g in external threads). ![]() If the pitch is the normally used "coarse" pitch listed in ISO 261 or ISO 262, it can be omitted (e.g., M8). The relationship between the height H and the pitch P is found using the following equation where θ DesignationĪ metric ISO screw thread is designated by the letter M followed by the value of the nominal diameter D ( D maj in the diagram above) and the pitch P, both expressed in millimetres and separated by the multiplication sign, × (e.g., M8×1.25). The outermost 1⁄ 8 and the innermost 1⁄ 4 of the height H of the V-shape are cut off from the profile. In the plane of the thread axis, the flanks of the V have an angle of 60° to each other. ISO metric threads consist of a symmetric V-shaped thread. Each thread is characterized by its major diameter, D ( D maj in the diagram), and its pitch, P. ![]() The design principles of ISO general-purpose metric screw threads ("M" series threads) are defined in international standard ISO 68-1. ![]()
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