Below is a list of Heavy Duty Casters manufacturers from San Francisco, California. Heavy duty casters have the highest strength, resistance and load capacity of all the caster types. They are used to carry heavy weight and large loads, and they are also employed in applications with significant shock possibilities. Casters classified as heavy duty are defined by their maximum weight carrying abilities; this can be anywhere from three to 15 thousand pounds per caster, and furniture and equipment with casters usually have two or four casters.