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Dear all, I am building an elastic multi-body dynamic model and I need to model the screws connecting some parts in the model. I plan to model the screws as 1D beam elements. I have seen that I have two options, CBEAM and CMBEAM. The documentation says: CBEAM: The CBEAM bulk data entry defines a beam element (BEAM) of the structural model. CMBEAM: Defines a beam element for multi-body dynamics solution sequence without reference to a property entry. I'm leaning towards CMBEAM more as it specifically states the element is for multi-body dynamics. But I don't quite understand the differences between the two. I have seen CMS models which use CBEAM instead of CMBEAM so it seems it is indeed possible to use CBEAM in an elastic MBD analysis. I would be grateful for any further information regarding the differences between CBEAM and CMBEAM, as well as which one should be used for an MBD analysis comprising flexbodies. Best regards, Deniz Bilgili