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The below charts show all the possible thread size combinations of diameters/pitch as defined in ISO-261. MC – Metric Coarse Thread Series. MF – Metric Fine Thread Series. Click to get the Full Thread Data-Sheet for a specific combination.
The design principles of ISO general-purpose metric screw threads ("M" series threads) are defined in international standard ISO 68-1. Each thread is characterized by its major diameter and its pitch. ISO metric threads consist of symmetric V-shaped thread.
The following table chart defines standard metric external thread size M1.6 to M18 per. ANSI/ASME B1.13M-1995. These thread sizes and classes represent bolts and screws, as well, as other standard external threads.
Metric thread specifications are different because the thread pitch is defined by the distance between each thread in mm instead of threads per inch. For example, an M12x1.75 (coarse) thread has a 1.75mm pitch, while an M12x1.50 (fine) thread has a 1.50mm pitch. Both DIN and ISO standards for metric threads ignore the pitch callout on coarse ...
ISO 724 specifies basic dimensions of metric threads in accordance with ISO 261. Dimensions refer to the basic profile in accordance with ISO 68. The pitch varies from coarse to extra fine with up to 5 different pitches for some dimensions. The thread angle is 60 o and the thread depth is 0.614 x pitch.
In this blog post, an experienced mechanical engineer demystifies thread pitch and explains how to decipher the code. With clear examples and helpful charts, you'll learn the difference between metric and imperial thread standards and gain practical tips for avoiding costly mistakes.
* - ISO Standard-1st Choice ** - ISO Standard-2nd Choice *** - ISO Standard-3rd Choice X - DIN (German Standard Basic Major Diameter US Standard Metric Inch mm Nominal Diameter mm Thread Per Inch (TPI) Nominal Diameter mm Standards Pitch in mm UNC UNF UNEF UNM Coarse Fine M Taper.0118 0.30 0.30 318 X 0.075