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 Thermoplastic Rubber Casters w/ 4" Wheels · 4 Styles · Up to 300 lb · Ref 234

Plate sizes: 4 x 4-1/2Bolt holes: 2-5/8 x 3-3/8 slotted to 3 x 3Diameter: 4 inTread: 2 inCapacity: up to 300 lb

4 x 4-1/2 inch top-plate casters for finished floors and quiet institutional carts. Expect wheel diameters 4 in, rubber treads, and capacities 300 lb. When floors see chemicals or washdowns, prefer sealed bearings and non-absorbent wheel compounds. 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.