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.

Ergonomic Casters by Wheel Size · 3 5" Wheels · Up to 250 lb · Rubber

Plate sizes: 2-1/2 x 3-5/8, 2-11/16 x 3-5/8Bolt holes: 1-3/4 x 2-13/16Diameter: 2-1/2, 3-1/2 inTread: 1-1/4 inCapacity: up to 250 lb

22 Series (To 325 Lb/Ea) polyurethane and rubber casters sized for warehouse carts on epoxy and smooth concrete. Catalog chips cover top plates around 2-1/2 x 3-5/8, wheel diameters 2-1/2, 3-1/2 in, and polyurethane and rubber treads. Bring plate and stem measurements when replacing unmarked casters so the new corners sit level. Harder poly rolls easier on smooth epoxy; softer poly cushions vibration on uneven slabs.