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.

DuraStar Rubber Casters w/ 8" Wheels · 4 Styles · Up to 675 lb · Ref 20

Plate sizes: 4 x 4-1/2Bolt holes: 2-5/8 x 3-5/8Diameter: 8 inTread: 2 inCapacity: up to 675 lb

4 x 4-1/2 inch top-plate casters for finished floors and quiet institutional carts. You will see wheel diameters 8 in, rubber treads, and capacities 675 lb across the SKUs listed below. Match bolt-hole spacing or stem diameter to the frame before you standardize a fleet. Size capacity from the heaviest corner load with shock margin, and keep overall height consistent across the set. These light-duty options cover everyday finished floors and quiet institutional carts without jumping to extreme forged series.