I am not sure of the official weight rating, I use them for 5 drawer file cabinets full of hobby files and books, so a good 300 or more pounds. They are originally for M16/M249 weapon racks in the armed forces and law enforcement armories. 2 to 4 man carry when moving/lifting for transpo. On hard surface like concrete floor (garage) there might be significantly more weight being held. The casters are large and movement with weight even on carpet is smooth and easy. I don't think you can really go wrong with these.