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.

4" x 1.25" Polyurethane Casters

Plate sizes: 2-1/2 x 3-5/8, 2-11/16 x 3-5/8Bolt holes: 1-3/4 x 2-13/16Diameter: 4 inTread: 1-1/4 inCapacity: up to 275 lb

22 Series (To 325 Lb/Ea) polyurethane casters sized for warehouse carts on epoxy and smooth concrete. You will see top plates around 2-1/2 x 3-5/8, wheel diameters 4 in, and polyurethane treads across the SKUs listed below. Confirm stem length and thread pitch on stem mounts so the shoulder seats flush in the boss. Size capacity from the heaviest corner load with shock margin, and keep overall height consistent across the set.