Hello... do you know where to find U bolts for inventor ?can be here on the sit.. or in the library of inventor.... i already search.. and did not find... Need some help... Thx... 

Did you look in CAD Blocks: Mechanical / Bolts?

http://www.cadforum.cz/catalog_en/file.asp?blk=6167

but this is for autocad... and for inventor ?? dont have ??for diffent sizes...thx..

Just over the size limit for this site but you can download it from here. https://grabcad.com/library/u-bolt-2-1-2-x-5-1-2-x-5-16-1/files/10001307.ipt

Free digital content for Inventor.  Parts, parts and more parts.http://www.cbliss.com/inventor/Parts/Hardware/index.htm

thx