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.

8" x 3" Polyurethane Casters · 3,000-3,500 lb

Plate sizes: 5-1/4 x 7-1/4Bolt holes: 3-3/8 x 5-1/4 slotted to 4-1/8 x 6-1/8Diameter: 6, 8, 12 inTread: 3 inCapacity: up to 3,500 lb

5-1/4 x 7-1/4 inch top-plate casters for warehouse carts on epoxy and smooth concrete. You will see wheel diameters 6, 8, 12 in, polyurethane and steel treads, and capacities 3,000 to 3,500 lb across the SKUs listed below. Bring plate and stem measurements when replacing unmarked casters so the new corners sit level. Larger plates spread bolt stress on thick frames under continuous tow abuse.