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.

  • 1
    $\begingroup$ 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

2 Answers 2


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.


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.


Your Answer

By clicking “Post Your Answer”, you agree to our terms of service and acknowledge you have read our privacy policy.

Not the answer you're looking for? Browse other questions tagged or ask your own question.