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/ 4" Wheels · 4 Styles · Up to 450 lb · Ref 238

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 450 lb

4 x 4-1/2 inch top-plate casters for finished floors and quiet institutional carts. Typical builds show wheel diameters 4 in, rubber treads, and capacities 450 lb. Pair swivel and rigid casters for tracking, or use total locks where the cart must park on a grade. Bring plate and stem measurements when replacing unmarked casters so the new corners sit level. These light-duty options cover everyday finished floors and quiet institutional carts without jumping to extreme forged series.