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FAQ: How do I determine the load requirement of a caster?

Take the weight of the load being carried and add the weight of the cart together. Take that total and divide it by three, which will give you the minimum rated load capacity each caster should have. This is also applicable for carts where a four-caster configuration is desired. (Division by three instead of four is due to the fact that three points make a plane, as well as that uneven floor surfaces frequently require three casters to carry the entire load.)