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.

5" x 1-1/4" Rubber Casters

Plate sizes: 3-1/8 x 4-1/8Bolt holes: 2-3/8 x 3-3/8 slotted to 3-7/16Diameter: 3, 4, 5 inTread: 1-1/4 inCapacity: up to 325 lb

3-1/8 x 4-1/8 inch top-plate casters for finished floors and quiet institutional carts. Typical builds show wheel diameters 3, 4, 5 in, rubber treads, and capacities 275 to 325 lb. Size capacity from the heaviest corner load with shock margin, and keep overall height consistent across the set. When floors see chemicals or washdowns, prefer sealed bearings and non-absorbent wheel compounds. These light-duty options cover everyday finished floors and quiet institutional carts without jumping to extreme forged series.