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.

10" x 3" Poly-on-Iron Casters

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: 10 inTread: 3 inCapacity: up to 4,200 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 10 in, polyurethane treads, and capacities 3,500 to 4,200 lb across the SKUs listed below. When floors see chemicals or washdowns, prefer sealed bearings and non-absorbent wheel compounds. Larger plates spread bolt stress on thick frames under continuous tow abuse. Size capacity from the heaviest corner load with shock margin, and keep overall height consistent across the set.