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Given the nominal size of a bolt/nut, e.g M10, can one construct all other dimensions from it? Do these dimensions differ between manufacturers or are these standardized. If so, where can I find tables with these dimensions. My goal is to make a CAD design library with all these DIN/ISO bolts. For this I need all exact dimensions.

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    $\begingroup$ Yes, metric, Whitworth, UNC etc etc all the details are easily found. $\endgroup$
    – Solar Mike
    Sep 29, 2022 at 9:21
  • $\begingroup$ Inventor already has such a CAD design library. You can also download bolt CAD files from McMaster. $\endgroup$
    – Emily Conn
    Sep 29, 2022 at 14:12
  • $\begingroup$ The bolt&nut dimensions are standardised, just be sure to pick the right standard. $\endgroup$ Sep 30, 2022 at 17:25

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The thread shape and pitch of all M-series nuts & bolts is standardised. So an M10 nut from one manufacturer will fit an M10 bolt from another.

There's no standard for the length - you can buy bolts in a wide variety of different lengths.

There are lots of different head styles too, but if you're thinking of a hexagonal nut and hex-head bolt, then it should be the same wherever you buy it. Find the web supplier of a reputable company that provides data sheets.

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I remember in high school drawing these by hand. The basic design is an hexagonal head chamfered at 45° to the diameter of the inscribed circle to the points of the hexagon.

M10 means 1mm across the flats or specifically the diameter of the inscribed circle.

An M32 would have a 32mm diameter circle.

The height of the head is proportional to the diameter at 50%. So an M10 is over designed compared to an M32 due to material strength properties and tools used.

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