Wie lade ich mir DIN und ISO Halbzeuge herunter.. Bitte Step by Step..

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Hrmm.   You are asking how to download DIN and ISO products......  you are going to have to give a lot more information.

Are you talking about Toolbox fasteners?

This is a little outdated, but it still has some good info:

A Complete Guide to Using SOLIDWORKS Toolbox

Or, are you talking about new fasteners that aren't listed in the toolbox?

Normally my resource is McMaster-CARR: McMaster-CARR