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Putting your own default configuration names in requires editing the database outside of the SolidWorks interface, which is non-supported. (you may need to scroll down in the size selection dialog to see the configuation name and its edit box) You may manually type over them at the time of drag & drop and it will keep that name, but it must be absolutely unique. But the default configuration names of the individual sizes are controlled by hidden tables in the relational database. Document Properties - File Names, and turn Countersunk Elevator Bolt.sldprt into Locking Head Bolt.sldprt for instance. You can set up alternate file names under Toolbox-Browser Configuration. You can create a derivative part in a new Toolbox standard (such as Low Head Socket Cap Screw in MyOwnANSI) but otherwise, the customize data process is not designed to allow addition of totally new items (like wave springs) that the relational database has not been previously set up for. RE: How do toolbox parts determine by solidworks ? cninneman (Industrial) 1 Dec 04 17:10 To really customize the Toolbox library itself get help from a VAR AE or independent CSWP. You can put copies of some of the items in your Design Library (Feature Palette) and then edit them to make something new, but editing the source files directly will likely prevent multi-user access and could possibly result in size configurations that will not rebuild correctly. You can customize Toolbox hardware to a fair extent by going to Tools-Options-Data Options- and start making standards or dimensional changes in the database. You can approximate some of the Toolbox behavior with Design Table driven configurations and part equations, but you will not be able to get the same depth of choices. Thus you can create any subset of the 10 million hardware items, without tying up the system and network resources to store that many. (Socket Head Cap Screw alone, offers 32,000 possible combinations) Your installation of the library only contains the standard, size, length, and feature options that you have selected to use so far. That is how it can provide over 10 million possible items from just 1000 actual part files.
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It also creates new configurations on the fly, from size and type information contained in a large multi-relational database. This is done to better allow for multiple users working in different assemblies with the same fasteners, without the need for duplicate items everywhere. Toolbox parts in 20 are read-only, and the library toggles the flag just long enough to dynamically create the configuration you select and resave the file.