Hi all
I share this site → https://www.mcmaster.com/
There are plenty of 3D models for mechanical designs.
Have a nice day.
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Thank you 
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Hello
A little note to the designers: this is basically an American site.
So you have to be careful because the majority of the components are in imperial dimensions.
But they still have a lot of parts in metric dimensions and recently they have been delivering directly to France/Europe.
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Hello OlivierH,
Thank you very much for the information. But be careful to take into account Froussel's remark, which I salute.
Kind regards.
AR.
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