Knurling bolt and nut

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I added two .f3d files made in a simple way on Autodesk Fusion 360.
- new_knurling_bolt_01.f3d
- new_knurling_nut_01.f3d

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I published [Yet another knurling bolt and nut](https://www.thingiverse.com/thing:3179814).

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I uploaded Fusion360 (.f3d) files and step files.

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An image of the tolerance between the nut and bolt was uploaded.
Only measured on 3dcad.
See at last thumbnail.

***< SUMMARY >***
There are knurling bolts and a nut that modeling on Autodesk Fusion 360.
I got a inspiration form [Knurled surface finishing library](http://www.thingiverse.com/thing:9095) by [aubenc](http://www.thingiverse.com/aubenc/about). Thanks!

I've prepared a bolt of various lengths.
So, print a bolt you want.

Bolts are M16, pitch 2.0, length 20, 30, 40, 50, 60mm, and Head OD 30mm, height 20mm.
A nut is M16, pitch 2.0, height 20mm.

See my YouTube about how to making a knurling on Fusion 360 [Modeling a knurling on Autodesk Fusion 360](https://youtu.