The below capacity ranges indicate the working (dynamic) load that each caster will support. A safety factor should be included in your formula to determine your required load rating per caster.

W/(C-1)=R W is total weight needed to move. C is total number of casters required. R is ideal load rating, with safety factor built in. Divide the total load weight by one less caster than you will use to safely determine load rating.

Albion Ergonomic Casters w/ Precision Ball Bearings · 4"–6" · 1,000 lb · Polyurethane

Plate sizes: 4 x 4-1/2Bolt holes: 2-5/8 x 3-3/8 slotted to 3 x 3Diameter: 4, 6 inTread: 2 inCapacity: up to 1,000 lb

Match a 4 x 4-1/2 top plate when bolting casters under warehouse carts on epoxy and smooth concrete. Expect wheel diameters 4, 6 in, polyurethane treads, and capacities 1,000 lb. Softer treads quiet finished floors; harder compounds last longer on chips, heat, and rough concrete. Use kingpinless or heavy plate series when shock loads keep shearing kingpin races. These medium-duty options cover everyday warehouse carts on epoxy and smooth concrete without jumping to extreme forged series.